IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
A presentation giving the basic principles of corrosion. Electrochemical nature of corrosion, anodic and cathodic reactions, electrode potentials, mixed potential theory and kinetics of corrosion, thermodynamics of corrosion and Pourbaix diagrams, and passivization behavior of metals are outlined.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
A presentation giving the basic principles of corrosion. Electrochemical nature of corrosion, anodic and cathodic reactions, electrode potentials, mixed potential theory and kinetics of corrosion, thermodynamics of corrosion and Pourbaix diagrams, and passivization behavior of metals are outlined.
Effects of Continuous Cooling On Impact and Micro Structural Properties of Lo...IJMER
Some mechanical properties and microstructural analysis were conducted on shielded
metal arc weldments of low carbon steels in some simulated environments. Specimens were prepared
and subjected to welding and continuous cooling at the same time at various positions. Results obtained
for impact strength using Charpy impact testing machine showed that impact strength of water cooled
samples were higher compared to salty water cooled samples. This is due to the increased formation of
martensitic structure and finer pearlite grains. The microstructure of the samples was studied using
photographic visual metallurgical microscope. For low cooling rate as in the air cooled sample, the
austenite was observed to transform into ferrite and pearlite. Ferrite is a body-centred cubic crystal
structure of iron alloys. For higher cooling rates of water and salt water cooled samples, low
temperature transformation products like bainite (an acicular microstructure which is not a phase) or
martensite (a very hard form of steel crystalline structure) were formed. The salt water cooled samples
had more martensite regions because of the increased cooling rate
STUDY OF THE EFFECT OF METAL COUPLING ON THE RUSTING OF IRONKrishna Yadav
In this project the aim is to investigate effect of the metals coupling on the rusting of iron. Metal coupling affects the rusting of iron. If the nail is coupled with a more electro-positive metal like zinc, magnesium or aluminium rusting is prevented but if on the other hand, it is coupled with less electro –positive metals like copper, the rusting is facilitated.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
“A note on natural adsorbant (moringa oleifera) as antimicrobial agent in wat...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Effects of Continuous Cooling On Impact and Micro Structural Properties of Lo...IJMER
Some mechanical properties and microstructural analysis were conducted on shielded
metal arc weldments of low carbon steels in some simulated environments. Specimens were prepared
and subjected to welding and continuous cooling at the same time at various positions. Results obtained
for impact strength using Charpy impact testing machine showed that impact strength of water cooled
samples were higher compared to salty water cooled samples. This is due to the increased formation of
martensitic structure and finer pearlite grains. The microstructure of the samples was studied using
photographic visual metallurgical microscope. For low cooling rate as in the air cooled sample, the
austenite was observed to transform into ferrite and pearlite. Ferrite is a body-centred cubic crystal
structure of iron alloys. For higher cooling rates of water and salt water cooled samples, low
temperature transformation products like bainite (an acicular microstructure which is not a phase) or
martensite (a very hard form of steel crystalline structure) were formed. The salt water cooled samples
had more martensite regions because of the increased cooling rate
STUDY OF THE EFFECT OF METAL COUPLING ON THE RUSTING OF IRONKrishna Yadav
In this project the aim is to investigate effect of the metals coupling on the rusting of iron. Metal coupling affects the rusting of iron. If the nail is coupled with a more electro-positive metal like zinc, magnesium or aluminium rusting is prevented but if on the other hand, it is coupled with less electro –positive metals like copper, the rusting is facilitated.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
“A note on natural adsorbant (moringa oleifera) as antimicrobial agent in wat...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A novel association rule mining and clustering based hybrid method for music ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Effect of calcination on the electrical properties and quantum confinement of...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Analysis of multiport dc dc converter in renewable energy sourceseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Evaluating paas scalability and improving performance using scalability impro...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Experimental study on corrosion of steel in soil mediumeSAT Journals
Abstract
There are many practical situation were steel is exposed to soil. Deterioration of steel in such case it depends upon the nature of soil, more especially the types and the concentration of ions present in the moisture within the soil, since soil vary in nature it is necessary to understand the nature of corrosion of steel in each of soil samples. This aspect was taken for the investigation and present in this paper. The weight and electrochemical methods of evaluating the corrosion rate were used in which four types of soil available around SRM university campus were utilized during the experimental work. Steel coupon of 12mm diameter and 100mm length was used, for each soil three artificial environments were created and electrochemical potential measuring was made for five weeks. The test shows that presence of chlorides ions in the soil create very severe environment and the drying of soil reduce the rate of corrosion.
Keywords, Corrosion of steel, Soil, Weight method, Electrochemical potential method
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Comparison of corrosion behaviour of commercial aluminium engine block and pi...msejjournal
The corrosion behavior of commercial aluminium alloy engine block and piston was investigated in 3.5% NaCl solution. The study was done by conventional gravimetric measurements and complemented by scanning electron microscopy (SEM) and X-ray analyzer (EDX) investigations. The results obtained indicate that the alloys suffers a process of corrosion localized to the area surrounding the precipitates of the Al (Si, Mg) and Al-Mg, which resulted in hemispherical pits. No evidence was found of the formation of crystallographic pitting for exposure times up to 54 days. Gravimetric analysis confirmed that with varying exposure periods the weight loss of the alloys increases and the normal corrosion rate profile of an initial steep rise followed by subsequent fall were observed for both alloys. The rate of corrosion of piston was found to be lower than that of engine block due to presence of Ni and lower percentages of Fe in aluminium piston alloy.
In the present investigation the corrosion measurements were carried out in 5% NaCl
aqueous solution, 2.5% HCl. solution for predetermined time intervals and varying
percentage concentrations of HCl solution at room temperature. Kinetics of corrosion
effect on samples of Al-Zn alloy, Al-Zn –5wt% flyash and silicon carbide particles and
Al-Zn –10wt% flyash and silicon carbide particles as reinforcement in composite are
studied.
Corrosion represents one of the most serious noticed in the industrial world especially in petrochemical, petroleum, power plants, etc.
Billions of Dollars are lost yearly due to the affect of corrosion in the world.
General Corrosion
Galvanic Corrosion
Concentration-Cell Corrosion
Intergranular Corrosion
Stress Corrosion Cracking
Pitting
An introductory presentation on corrosion and its prevention. Importance of corrosion, cost of corrosion, various forms of corrosion, and preventive methods are given.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
#vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore#blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #blackmagicforlove #blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #Amilbabainuk #amilbabainspain #amilbabaindubai #Amilbabainnorway #amilbabainkrachi #amilbabainlahore #amilbabaingujranwalan #amilbabainislamabad
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdf
Effect of anions in seawater to corrosion attack on
1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 733
EFFECT OF ANIONS IN SEAWATER TO CORROSION ATTACK ON
PASSIVE ALLOYS
A. Ismail1
, N.E. Loren2
, N.F. Abdul Latiff3
Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia,
azzura@uthm.edu.my1
cd100019@siswa.uthm.edu.my2
noorfareezalatiff@gmail.com3
Abstract
Some metals and alloys have special characteristics that enable them to provide superior corrosion-resistant metal surfaces.
These protective passive films are responsible for the phenomenon of passivity. Metals with this characteristic can be categorized
as passive materials such as stainless steel 316L and nickel alloy Inconel 625. However, in corrosive environment this protective
passive film may breach and exposed bare metal for further corrosion attack. Corrosive environment can be refer as metal is
susceptible to corrosion attack such as seawater which contain aggressive ions (salt) with negative charge (anion). An
electrochemical test has been carried out to determine the effect of anion on corrosion attack of 316L and Inconel 625. The
objective is to identify the breakdown potential (Eb) in different anion ratio (chloride (Cl-
) : sulphate(SO4
2-
). The anions
concentration was decided as Cl-
: SO4
2-
; 35:0, 25:10, 10:25, 0:35 and was compared to artificial seawater, 3.5% NaCl. The pH
values were set in neutral in static condition. The materials were run for cyclic polarization with a scan rate of 2mV/sec. The Eb
value for 316L decreased in every solution as the temperature increased from 30°C to 80°C. The results explain that SO4
2-
has
inhibiting effect to passive alloy showing that the highest Eb value detect at 30°C and highest concentration of SO4
2-
. Optical
observations elucidate that, the number of pits increased in high concentration of Cl-
than SO4
2-
. Both materials presents pits
reducing as the temperature and concentration of SO4
2-
ions increased. Nevertheless, the Eb value for 316L is likely to has a
competition effect between Cl-
and SO4
2-
anion as the graph shows no significant effect at Cl-
: SO4
2-
,25:10, 10:25. The same
scenario is not shown by Inconel 625 because this metal is highly corrosion resistance compared to 316L.
Index Terms: 316L, Inconel 625, Anions, Sulphate, Chloride, Breakdown potential
--------------------------------------------------------------------***----------------------------------------------------------------------
1. INTRODUCTION
Corrosion is a natural phenomenon that can divide into
several types based on its mechanism. Two general class of
corrosion are uniform and localized. Uniform attack
normally characterized by a chemical or electrochemical
reaction that proceeds uniformly over the entire exposed
surface or over the large area while localized corrosion is
defined as the selective removal of metal by corrosion at
small area on a metal surface in contact with a corrosive
environment such as liquid. The major corrosion parameters
are listed as dissolved salts, oxidizing agents, temperature
and pH. Salts are minerals that dissolve in water. They
include potasium (K+
), chloride (Cl-
), sodium (Na+
),
sulphate (SO4
2-
), magnesium (Mg2+
), and calcium (Ca2+
).
These are present in higher concentrations in seawater than
in freshwater [1].
1.1 Seawater
Seawater is a highly corrosive electrolyte to all kind of
metals. The aim of this study is to identify the behavior of
aggressive anions on passive alloy. Anions are one of the
parameter that affects corrosion attack on metals including
corrosion resistance alloys (CRAs) such as 316L and
Inconel 625. It is exist everywhere especially in seawater.
Although the composition of anions in seawater is only
minimal, it can bring a massive impact to material’s
degradation. As corrosion can be explained as deterioration
of material with environment, anion can be considered as
one of the main factor that affects corrosion attack namely
sulphate (SO4
2-
) and chloride (Cl-
).
1.2 Passive material
Steel is an alloy of iron and other elements including carbon.
Steel become stainless when it contain a minimum of 10.5%
chromium. Stainless steel 316L is the low carbon version of
316 and is immune from sensitisation. It contains 16-18%
composition of chromium [2,3]. The composition chromium
is a chemical reaction which is improved corrosion
resistance in stainless steel. The better corrosion resistance
is due to a chromium oxide film that is formed on the steel
surface. Effects of corrosion on the metal structure can be
seen from two important aspects in terms of aesthetic and
ability. In terms of aesthetic, corrosion attacks the surface of
2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 734
material where it causes the surface to be damaged and dirty
while the effects in terms of the ability was evident from the
ability of such metal in a long time.
1.3 Basis of Corrosion Reactions
Aqueous corrosion is an electrochemical process that occurs
at the interface between a material (commonly, but not
exclusively, a metal) and an aqueous solution. For corrosion
to occur, an oxidation reaction (metal dissolution and/or
metal oxide formation) and a reduction reaction (proton,
water, or dissolved oxygen reduction) must occur
simultaneously. Materials may also be subject to
deterioration in high-temperature environments.
1.4 Passivity
All metals and alloys, with the exception of gold, have a thin
protective film—a corrosion product—present on their
surface resulting from reaction with the environment. These
films prevent the metals from reverting back to the
thermodynamically stable condition of their origin, the ores
used to produce them. Some of these films—the passive
films—on some, but not all, metals and alloys have special
characteristics that enable them to provide superior
corrosion-resistant metal surfaces. These protective passive
films are responsible for the phenomenon of passivity.
1.3 Corrosion mechanism
Corrosion phenomena can be measured by electrochemistry
process. It is a process involved a reaction between metal
and electrical energy and occurs when the electrical current
impose into the water. The chemical reactions that occur are
reduction-oxidation reaction. These reactions require a
species of material that oxidized such as metal and another
thing that is reduced is such as the oxidizing agent. Thus, it
can divide into two simultaneous reactions. The oxidation of
a metal is happen at an anode while the reductions of a
substance happen in cathode. In oxidation process, the metal
losses electrons and in a reduction process, the oxidizing
agents gain the electrons that have been shed by the metal.
2. METHODOLOGY
The sample was soldered and embedded in resin for
polishing with identified surface area. It was grind with 240-
1200grit SiC paper and wet polish with 600-grit SiC paper
until previous coarse scratch by sectioning are removed. The
hardness and microstructure was observed before and after
corrosion attack using Potentiaostat/galvanostat in
conjunction with three electrodes. The solutions (electrolyte)
also were prepared with different sulphate and chloride ratio
and electrochemistry was run for cyclic potentiodynamic
polarization (CPP) measurement at different temperatures
(30 ºC, 50 ºC and 80ºC).
For CPP measurement, after the current density reaches a
preset value of 500μA/cm2
, the potential then gradually
returns to the open circuit potential. The breakdown
potential, Eb ( the least noble potential where corrosion will
initiate and propagate) is then identified, which is the
potential where the current increases with increasing
potential. The polarization scan is plotted as potential versus
logarithm of the current.
3. RESULTS AND DISCUSSION
Generally, the results show that chloride (Cl-
) ions is an
aggressively anion than sulphate (SO4
2-
) ions which
propagate to the corrosion attack. For Vickers hardness test,
it can be clearly observed that the changes in the material
hardness after the corrosion attack increased as the
temperature and the concentration of chloride (Cl-
) ions
increases. Figure 1 and 2 shows the different hardness value
on Stainless Steel 316L and Inconel 625 before and after
corrosion attack in five solutions in three different
temperatures which is 30°C, 50°C and 80°C respectively.
Hardness covers several properties of metal such as
resistance to deformation, resistance to friction and abrasion.
The reduction in hardness is usually accompanied by an
increase in ductility, thereby decreasing the brittleness of the
metal. In overall, the greater the hardness of the metal, the
greater resistance it has to deformation. The hardness values
of Stainless Steel are significant to corrosion attack but the
hardness values are not significant on Inconel 625. This is
because Inconel 625 is very tough and high in corrosion
resistance (uniform corrosion).
Figure 1:Different hardness of stainless steel 316L after
corrosion attack with different ratio of Cl-
:SO4
2-
Figure 2: Hardness value of Inconel 625 before and after
corrosion attack in 3.5% NaCl, and different Cl-
:SO4
2-
ratio;
35:0, 25:10, 10:25, 0:35
0
10
20
30
40
30 50 80
DifferentHardness(Hv)
Temperature (°C)
35:0
25:10
10:25
0:35
3.5% NaCl
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Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 735
From the Figure 3 to 7 shows the CPP plot for stainless steel
316L in Cl-
:SO4
2-
value 35:0, 25:10, 10:25, 0:35 and in 3.5%
NaCl respectively at 30°C, 50°C and 80°C. All the
polarizations presents as positive hystheresis (forward scan
are higher than reverse scan) which explained that the
materials has possibility to be attacked by pitting corrosion
as passive film breaks. The lowest breakdown potential (Eb)
values were found at highest solution of chloride (Cl-
)
concentration at 80°C followed by the corresponding values
of chloride (Cl-
) and sulphate (SO4
2-
) at the lowest
temperature. From the result of the cyclic polarization
studies, it is contingent that breakdown potential (Eb), is
shifted to more negative value with the increasing of
chloride (Cl-
) concentration and temperature. This shows
that the pitting potential is more active at the high
concentration of ion chloride (Cl-
).
Figure 3: CPP for stainless steel 316L in Cl-
:SO4
2-
35:0
Figure 4: CPP for stainless steel 316L in Cl-
:SO4
2-
25:10
Figure 5: CPP for stainless steel 316L in Cl-
:SO4
2-
10:25
Figure 6: CPP for stainless steel 316L in Cl-
:SO4
2-
0:35
Figure 7: CPP for stainless steel 316L in 3.5% NaCl
Temperature is a critical factor in pitting corrosion. Figure 8
is a plot of breakdown potential (Eb) of solution in three
different temperatures. The results show a shift of
breakdown potential (Eb) to more effective value as the
temperature increases. At low temperatures, extremely high
breakdown potential (Eb) are observed. At higher
temperatures, the pitting potential decrease. The
microstructure evaluation shows that heavy pit density
occurs at the higher temperatures but in smallest pit depth.
Figure 8: Breakdown potential of stainless steel 316L in
3.5% NaCl and different Cl-
:SO4
2-
ratio at increasing
temperature.
In other words, the process of pit nucleation at high
temperature is more unstable. These indicate that stainless
steel 316L exhibit a higher pitting resistance at low
temperature in seawater. Moreover, with rise in the
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Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 736
temperature, the physical structure of the passive film is
affected resulting in variation of pitting corrosion.
The CPP also was run for Inconel 625 in different Cl-
:SO4
2-
ratio at 30°C as shown in Figure 9. All the polarisaion
behaves as negative hystheresis (forward scan is lower than
reverse scan) which explains that pitting might not occur on
Inconel 625 after passive film breaks.
Figure 9: CPP of Inconel 625 in different Cl-
:SO4
2-
ratio at
30°C.
Inconel 625 is a stainless steel in nickel alloy group. The
The main reason for nitrogen alloying in Inconel 625 is to
increase the mechanical strength of the steel and to replace
some of the expensive nickel alloying element. In addition,
increased nitrogen content can also increase the resistance to
localised corrosion and retard the precipitation of the
carbide and intermetallic phases [4]. Figure 10 presents the
breakdown potential (Eb) of Inconel 625 in different solution
ratio. The highest Eb value in obtained by Inconel 625 in
3.5% NaCl and varying the chloride-sulphate ratio does not
give any significant effect to Inconel 625 as this material is
very resistance to corrosion attack. This is contradict as
what presented by stainless steel 316L which shown that
stainless steel is highly corrosion in 3.5% NaCl (lowest Eb
value in Figure 8).
Figure 10: Potential versus current for Inconel 625 in
different chloride-sulphae ratio.
The difference in microstructure that occurs before and after
test shows that the corrosion effect is become worst at the
highest temperature for each solution. For stainless steel
316L, the maximum of pits was found on a specimens
immersed in solution with high concentration of chloride
(Cl-
) as shown in Figure 10. This is closely related to the
different hardness test value after the corrosion test. As the
hardness value of the sample reduce, the resistance of a
material to plastic deformation also decreased. This is due to
the hardness of the sample decreased after the corrosion
attack. In the presence of chloride (Cl-
) or other halide ions,
the resistance of stainless steels to pitting corrosion is
enhanced by higher chromium (Cr), molybdenum (Mo), and
nitrogen (N). However, the pit also severe observed when
stainless steel 316L in 3.5% NaCl as shown in Figure 11.
The value of chromium (Cr), molybdenum (Mo), and
nitrogen (N) for stainless steel 316L are 16.5, 2 and 10
respectively. When crevice corrosion is initiated, for high
alloyed stainless steel with PREn>40 immersed in seawater,
it is possible for it to propagate at much lower temperature
than when initiated. The PREn value for stainless steel 316L
is 23.1 and it have high tendency to pitting and therefore it
not used for seawater applications.
For Inconel 625, the optical observation presents no pitting
attack except some minor of corrosion products developed
on the surface. This significant to the CPP plot which shown
that Inconel behaves as negative hystheresis in all solutions.
4.0 CONCLUSIONS
The susceptibility to pitting corrosion of austenitic stainless
steel 316L and Inconel 625 increased as the chloride (Cl-
)
ion concentration increased in seawater. However, the pits
hole does not observed on Incoenal 625. The breakdown
potential (Eb) of stainless steel 316L in seawater solutions is
greatly influenced by the temperature and the concentration
of ions chloride (Cl-
) in seawater. It can be proved by the
data obtained from the electrochemistry test. Increasing the
temperature from 30°C to 80°C would decrease the
breakdown potential (Eb) value in each solution. The OCP,
breakdown potential (Eb) and passive range of stainless steel
316L is decrease as the temperature and chloride ion
concentration increased. Other than that, the different of
hardness value and the number of pits on the sample surface
Figure 10 : Microscope
observation of stainless steel
316L in Cl-
:SO4
2-
ratio 35:0 at
30°, 50°C and 80°C respectively.
(a) (b)
(c)
Figure 11 : Microscope
observation of stainless
steel 316L in 3.5% NaCl at
80°C.
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Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 737
also increased as the temperature increased which indicate a
greater degradation of the corrosion resistance of stainless
steel 316L. At high chloride (Cl-
) content, chloride (Cl-
) ions
were the species responsible for pitting since the pit
morphology was the same as that observed in solutions
containing chloride (Cl-
) only. In this study, sulphate (SO4
2-
)
ions also had accelerating effect but are not responsible for
pitting corrosion. The PREn value for stainless steel 316L is
23.1 and it is therefore it not used for seawater applications.
ACKNOWLEDGEMENT
The authors would like to acknowledge the Universiti Tun
Hussein Onn Malaysia and Ministry of Higher Education
Malaysia (MOHE) for funded this research.
REFERENCES
[1]. Cicek, V. & Al-Numan, B., (2011), “Corrosion
Chemistry”, Canada: Scrivener Publishing LLC, pg 18, 19,
28.
[2]. Chawla, S.L. & Gupta, R.K., (1993), “Material
Selection for Corrosion Control”, ASM International, Page
122.
[3]. Premkumar, S.L., (2008), “Prep Manual for
Undergraduates: Orthodontics”, Elsevier, pg 277.
[9].Manganon P.L., The Principles of Materials Selection
for Eingineering Design, Prentice Hall, 1999, pp.512-535.
BIOGRAPHIES
A.Ismail is a lecturer in Universiti
Tun Hussein Onn Malaysia and has
more than 10 years experience in
teaching and research. Corrosion
and related material degradation is
the main interest of her.
N.E. Loren is a final year student at
Universiti Tun Hussein Onn
Malaysia under the supervision of
A. Ismail.
N.F. Abdul Latiff is a final year
student at Universiti Tun Hussein
Onn Malaysia under the supervision
of A. Ismail.