Atmospheric corrosion is a major cause of degradation and failure of metals exposed to outdoor and indoor environments. It accounts for significant economic losses as corroded metals must be replaced. While atmospheres are typically classified as industrial, marine, rural, or indoor, most real-world environments involve mixtures of conditions. Atmospheric corrosion occurs via localized corrosion cells and is influenced by factors like pollution, humidity, and proximity to salt or chemical sources. Proper material selection and protection methods are needed to prevent atmospheric corrosion in various environmental conditions.
A brief introduction to corrosion and types of corrosion, such as pitting corrosion.
Cavitations corrosion
Galvanic corrosion.
Fretting corrosion.
Crevice corrosion.
Intergranular and transgranular corrosion,
Stress corrosion
Corrosion, types of corrosion, examples and mechanism of Dry or Chemical Corrosion, Oxidation Corrosion, Nature of Oxide layer formed, Pilling - Bedworth rule, Passivity or Passivation
Video lecture is available on YouTube on the link:https://youtu.be/xrBnxxN-RUw
For UG students of All Engineering Branches, Chemistry, Food Science, Polymer Science, Chemical Engg. etc.
Corrosion of material - Engineering MetallurgyMechXplain
The PPT is on Corrosion and Degradation of Material specifically Metal and Reason Behind it. As well as the preventive measures to be taken to prevent it.
This ppt explains basics of corrosion, its significance, Mechanism of electrochemical and chemical corrosion, Cathodic protection, Anodic protection, Sacrificial protection, Galvanization, Concentration Corrosion, Pitting Corrosion and also describe about the prevention and control of corrosion with respect to protective coatings and modification in design.
A brief introduction to corrosion and types of corrosion, such as pitting corrosion.
Cavitations corrosion
Galvanic corrosion.
Fretting corrosion.
Crevice corrosion.
Intergranular and transgranular corrosion,
Stress corrosion
Corrosion, types of corrosion, examples and mechanism of Dry or Chemical Corrosion, Oxidation Corrosion, Nature of Oxide layer formed, Pilling - Bedworth rule, Passivity or Passivation
Video lecture is available on YouTube on the link:https://youtu.be/xrBnxxN-RUw
For UG students of All Engineering Branches, Chemistry, Food Science, Polymer Science, Chemical Engg. etc.
Corrosion of material - Engineering MetallurgyMechXplain
The PPT is on Corrosion and Degradation of Material specifically Metal and Reason Behind it. As well as the preventive measures to be taken to prevent it.
This ppt explains basics of corrosion, its significance, Mechanism of electrochemical and chemical corrosion, Cathodic protection, Anodic protection, Sacrificial protection, Galvanization, Concentration Corrosion, Pitting Corrosion and also describe about the prevention and control of corrosion with respect to protective coatings and modification in design.
Annual atmospheric corrosion rate and dose-response function for carbon steel...Carlos Arroyave
This paper presents an assessment on the behavior of plain carbon steel exposure to the atmosphere of Bogotá. The main climate and environmental parameters, including relative humidity (RH), temperature (T), sulphur dioxide deposition (DSO2) and particulate matter deposition (DPM) were measured. Furthermore, mass loss of AISI/SAE 1006 plain carbon steel coupons was measured along one year. In this case, coupons were exposed in eight test sites located across the city of Bogotá. Results show that the corrosion rate of carbon steel is less than 35 μm yr–1 after one year. It was found that the west part of the city has the greatest aggressivity, which has the highest levels of DPM and DSO2, related with the characteristics of the anthropogenic activities distribution across the city. A dose-response function of plain carbon steel exposure to the atmosphere of Bogotá, based on RH, T and DSO2, was obtained.
Corrosion is a topic which most of the engineers find difficult. I have tried to simplify the topic & have prepared a presentation for easy understanding covering almost all types of corrosion.
5 Weather Protection To Consider To Save Cost and Increase Efficiency Guide Orapi Asia
Weather is one factor that contributes most to the aircraft's weariness. While heat, humidity, rain, wind, and snow are all factors that contribute to the aircraft attrition rate, protection of the aircraft's surface is crucial to reducing the risk and costs of aircraft maintenance, especially in the MRO industry. Sometimes a combination of factors also has its own peculiar effect on different aircraft parts and makes them more difficult to repair and maintain. Here are some factors that you might want to consider when purchasing your surface protection and treatment supplies.
Find out how we can help reduce costs and increase your effectiveness in aircraft repair and maintenance. 👉 https://orapiasia.com/aviation-mro-orapi-asia/
Many forms of atmospheric pollution affect human health
and the environment at levels from local to global. These
contaminants are emitted from diverse sources, and some
of them react together to form new compounds in the air.
Industrialized nations have made important progress toward controlling some pollutants in recent decades, but air quality is much worse in many developing countries, and global circulation patterns can transport some types of pollution rapidly around the world. In this unit, discover the basic chemistry of atmospheric pollution and learn which human activities have the greatest impacts on air quality.
Pitting corrosion is an insidious localized form of corrosion causing much devastating
destruction to structural members such as stainless steel in chloride environment. This
paper gives a review of the mechanism processes of pitting, stages, factors facilitating
pitting corrosion, techniques of evaluating pitting corrosion and some research work on
pitting corrosion. The rudimentary knowledge of the mechanisms of pitting corrosion from
this work will be of assistance to the selection process, specification and the use of stainless
steels and other structural members.
Customer Bulletin 0611 Insulant Impact on Corrosion in Steel Piping Applicati...Dyplast Products
Corrosion is defined by the National Association of Corrosion Engineers as “the deterioration of a material, usually a metal, by reaction with its environment.” Corrosion under insulation (CUI) is not a distinct form of corrosion; rather it refers to the location where pipe wall material deterioration is occurring—underneath the insulation material and on the external surfaces of piping. CUI (and the corrosion of metal jackets and banding which is not addressed herein) is a recognized problem that must be addressed by designers, specifiers, and end-users. CUI can occur under any type of thermal insulation. The type of corrosion will depend on the metallurgy of the pipe as well as the mix of corrosive elements - - understanding that corrosive elements can be introduced during pipe production, pipe shipping/storage, installation, insulation contact, process liquid contact, weather, or other environmental influences.
Tensile, Impact and Hardness Testing of Mild SteelGulfam Hussain
The main purpose of this report is to study the mechanical properties and
failure mode of mild steel. Three types of standard tests i.e. tensile test, impact
test, and hardness test were conducted on the standard specimens of mild steel.
From the tests, results were obtained; Tensile strength, Impact strength, and
hardness were calculated. It was observed that Tensile Strength, Impact Strength
and Hardness of MS specimen were 1450.833 N/mm², 29.5 J & 59.25 HRB.
Welding process
Arc Welding
Resistance Welding
Oxy fuel Gas Welding
Other Fusion Welding Processes
Solid State Welding
Weld Quality
Weld ability
Design Considerations in Welding
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.
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/
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.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
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.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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.
Water Industry Process Automation and Control Monthly - May 2024.pdf
Atmospheric Corrosion
1.
2. Atmospheric corrosion is surely the most visible of all corrosion
processes, for example, rusty bridges, flag poles, buildings, and outdoor
monuments. The large segment of the paint industry committed to the
manufacture and application of products for the protection of metals,
as well as the large-scale operations of the galvanizing industry attest
to the importance of controlling atmospheric corrosion.
Economic losses caused by atmospheric corrosion are tremendous
and therefore account for the disappearance of a significant portion
of metal produced. Consider, for instance, agricultural machinery,
steel structures, fences, exposed metals on buildings, automobile
mufflers or bodies, and the myriad of other metal items that are sent
to the scrap yard when they become unusable as a result of corrosion.
These constitute direct losses from corrosion.
3. Atmospheric corrosion has been reported to account for more
failures in terms of cost and tonnage than any other type of material
degradation processes. This particular type of material degradation
has recently received more attention, particularly by the aircraft
industry, since the Aloha incident in 1988, when a Boeing 737 lost a
major portion of the upper fuselage in full flight at 7300 m [1].
All of the general types of corrosion attack occur in the atmosphere.
Since the corroding metal is not bathed in large quantities of electrolyte,
most atmospheric corrosion operates in highly localized corrosion cells,
sometimes producing patterns difficult to explain as in the example of
the rusting galvanized roof shown in Fig. 9.1.
4. Thus, calculation of the electrode potentials on the basis of ion
concentration, the determination of polarization characteristics, and
other electrochemical operations are not as simple in atmospheric
corrosion as they are in liquid immersion corrosion. However, all of
the electrochemical factors which are significant in corrosion processes
do operate in the atmosphere
5.
6. While atmospheres have been traditionally classified into four basic
types, most environments are in fact mixed and present no clear
demarcation. Furthermore, the type of atmosphere may vary with the
wind pattern, particularly where corrosive pollutants are present, or
with local conditions (Fig. 9.2) [2].
1. Industrial
2. Marine
3. Rural
4. Indoor
7.
8. Industrial
An industrial atmosphere is characterized by pollution composed
mainly of sulfur compounds such as sulfur dioxide (SO2), a precursor to
acid rain, and nitrogen oxides (NOx), the backbone of smog in modern
cities. Sulfur dioxide from burning coal or other fossil fuels is picked up
by moisture on dust particles as sulfurous acid. This is oxidized by some
catalytic process on the dust particles to sulfuric acid, which settles in
microscopic droplets and fall as acid rain on exposed surfaces. The
result is that contaminants in an industrial atmosphere, plus dew or fog,
produce a highly corrosive, wet, acid film on exposed surfaces
9. In addition to the normal industrial atmosphere in or near
chemical plants, other corrosive pollutants may be present. These are
usually various forms of chloride which may be much more corrosive
than the acid sulfates. The reactivity of acid chlorides with most
metals is more pronounced than the reactivity of other pollutants
such as phosphates and nitrates.
10. Marine
A marine atmosphere is laden with fine particles of sea mist carried
by the wind to settle on exposed surfaces as salt crystals. The quantity
of salt deposited may vary greatly with wind velocity and it may, in
extreme weather conditions, even form a very corrosive salt crust,
similar to what is experienced on a regular basis by sea patrolling
aircraft or helicopters [Figs. 9.3(a) and (b)].
11.
12.
13. The quantity of salt contamination decreases with distance from the
ocean, and is greatly affected by wind currents. The marine atmosphere
also includes the space above the sea surfaces where splashing and
heavy sea spray are encountered. The equipment exposed to these splash
zones are indeed subjected to the worst conditions of intermittent
immersion with wet and dry cycling of the corrosive agent (Fig. 9.4)
14.
15. 3. Rural
Rural atmospheres are typically the most benign and do not contain strong
chemical contaminants, that is unless one is close to a farm operation
where byproducts made of various waste materials can be
extremely corrosive to most metals
16. Arid or tropical atmospheres are special variations of the rural
atmosphere. In arid climates there is little or no rainfall, but there
may be a high relative humidity and occasional condensation. This
situation is encountered along the desert coast of northern Africa. In
the Tropics, in addition to the high average temperature, the daily
cycle includes a high relative humidity, intense sunlight, and long
periods of condensation during the night. In sheltered areas, the
wetness from condensation may persist long after sunrise. Such
conditions may produce a highly corrosive environment.
17. Indoor
Normal indoor atmospheres are generally considered to be quite
mild when ambient humidity and other corrosive components are
under control. However, some combinations of conditions may
actually cause relatively severe corrosion problems. While there is no
typical contaminant or set of conditions associated with an indoor
atmosphere, any enclosed space which is not evacuated or filled with
a liquid can be considered an indoor atmosphere. If not ventilated,
such an environment may contain fumes, which in the presence of
condensation or high humidity could prove to be highly corrosive.
18. Even in the absence of any other corrosive agent, the constant
condensation on a cold metallic surface may cause an environment similar
19. to constant immersion for which a component may not have been chosen
or prepared for. Such systems are commonly encountered in confined
areas close to ground level or, worse, below ground where high humidity
may prevail. Figure 9.5 shows the advanced corrosion of the frame and
contacts in an electric junction box only four years after a building was
completed. While the junction box in this example was only at the ground
level, the wires coming to the box were buried without additional
insulation and in constant contact with much cooler ground than ambient
air in the room. The repeated condensation of ambient humidity on the
electrical box support and on many of its connections caused enough
corrosion in such a short period of time to require the complete
replacement
of the system to avoid unscheduled power interruptions.