This chapter discusses corrosion testing methods and considerations. It describes 4 types of corrosion tests: 1) laboratory tests using small specimens, 2) pilot-plant tests that duplicate full-scale operations, 3) actual service tests in operating plants, and 4) field tests using exposed specimens. Key factors discussed include the materials tested, specimen size and shape, surface preparation, measurement techniques, exposure methods, and types of tests like boiling tests and sea water tests. The goal of corrosion testing is to evaluate materials, mechanisms, and environments in a controlled and reproducible manner.
Mainly focused on how hydrogen will get trapped in the weld bead and how it will causes the embrittlement which sometimes leads to hydrogen induced cracking.
Mainly focused on how hydrogen will get trapped in the weld bead and how it will causes the embrittlement which sometimes leads to hydrogen induced cracking.
14 Types of Corrosion explained in an awesome manner
Update 26 June 2019: I have enabled the Download option and now everyone can download the "Types of corrosions" PPT and reuse the slides :) I wish I have done this earlier.
Follow my blogs at https://www.geekdashboard.com/
This presentation is for mechanical engineering/ civil engineering students to help them understand the different type of destructive mechanical testing of materials. The tensile testing, hardness, impact test procedures are explained in detail.
Carburzing and Different Types of CarburzingMelwin Dmello
This Presentation covers the Basic concepts of Carburzing and Different Types of Carburzing in a easy version. For more information, please refer the books mentioned in the references slide.... Thank you
A brief knowledge about surface treatment, which is a process applied to the surface of a material to make it better in some way, for example by making it more resistant to corrosion or wear. Shot peening is a surface treatment in which small hard pellets are shot against the surface of a metal to make it more resistant to fatigue.
14 Types of Corrosion explained in an awesome manner
Update 26 June 2019: I have enabled the Download option and now everyone can download the "Types of corrosions" PPT and reuse the slides :) I wish I have done this earlier.
Follow my blogs at https://www.geekdashboard.com/
This presentation is for mechanical engineering/ civil engineering students to help them understand the different type of destructive mechanical testing of materials. The tensile testing, hardness, impact test procedures are explained in detail.
Carburzing and Different Types of CarburzingMelwin Dmello
This Presentation covers the Basic concepts of Carburzing and Different Types of Carburzing in a easy version. For more information, please refer the books mentioned in the references slide.... Thank you
A brief knowledge about surface treatment, which is a process applied to the surface of a material to make it better in some way, for example by making it more resistant to corrosion or wear. Shot peening is a surface treatment in which small hard pellets are shot against the surface of a metal to make it more resistant to fatigue.
The Utility of Zeta Potential Measurements in the Characterization of CMP Slu...HORIBA Particle
Guest speaker Dr. David Fairhurst joins HORIBA Scientific to discuss the important role zeta potential (ZP) plays in the performance of CMP slurries. In this webinar we will first review and discuss the importance of the iso-electric point of metal-oxide polishing agents and the role of slurry pH and then we will examine the effect of slurry fluid chemistry using ZP measurements to characterize the chemically-modulated development of surface charge of such polishing agents during aqueous polishing.
While particle size has been long recognized an important metric, the most fundamental and critical aspect of the CMP slurry system is the molecular interaction between the suspended particles and the medium at the interface. It is such an interaction, along with the particle–particle interactions, that determines the dynamic properties of the dispersion and strongly affect the performance of the slurry. In polishing, it is generally accepted that the removal rate is directly related to the availability of the surface hydroxyl groups on the abrasive particles. Thus, understanding the role of surface charge effects is important in optical finishing. The zeta potential is a parameter (symbol ζ), which is related to the surface charge (vide the interfacial chemistry), a property that all materials possess, or acquire, when suspended in a fluid; ZP measurements have long been recognized as a surrogate function of particle surface chemistry.
This talk is on some of the basics of making proper solar cell efficiency measurements and deriving correct information from 2 and 3 electrode measurements.
Visit our website at KamatLab.com for the latest news, publications, and research from our group.
Advantages of Ultrasonic Thickness Gages over Flaw Detectors for Corrosion Th...Olympus IMS
This presentation highlights the advantages of modern ultrasonic thickness gages for making corrosion thickness measurements. This information focuses on certain features that make thickness gages better suited than ultrasonic flaw detectors for this type of application.
Presenter:
Greg Bauer is a Product Specialist for ultrasonic thickness gages and transducers. He has several years' experience providing global technical and application support, training, and application development for the thickness gage and transducer product lines.
Analytical Measurements: Troubleshooting, Maintenance and the FutureISA Boston Section
Focuses on measurement of pH, ORP (Redox), and Conductivity and aspects related to inline measurement of these critical analytical parameters. Discussion topics include scientific theory, measurement challenges, proper troubleshooting, installation, key applications, and the future of analytical measurements
An introductory presentation on corrosion and its prevention. Importance of corrosion, cost of corrosion, various forms of corrosion, and preventive methods are given.
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.
This is an introductory presentation into the world of linings that are used in various industries. We will review what a lining is and what types of linings exist in the market place. We will also discuss how to choose or specify a lining system which includes surface preparation, proper application, repairs to lining defect and how fast a lining will be ready for service.
If you have any questions Contact us at:
http://info.international-pc.com/Solutions
Additive Manufacturing - Mechanical Test Methods - OMTEC 2018April Bright
Medical devices fabricated from additively-manufactured materials must undergo a variety of mechanical tests before receiving regulatory approval. Due to the complexity of manufacturing processes and the limited clinical knowledge of AM devices, they are subject to additional scrutiny by manufacturers and Notified Bodies. Several test methods for characterizing these devices are presented in this session, as well as the differences between testing additively-manufactured devices and those fabricated with traditional machining methods.
Sampling and analysis for feasibility studies and mineral processingBasdew Rooplal
This is an overview of some aspects of sampling involved in feasibility studies for mining and mineral processing. Some small scale bench test work is also covered.
Best Practices for Using Near Infrared for Snack QualityBob Schumann
Sample collection and analysis is important in calibrating near infrared transmitters and lab analyzers for snack food moisture, oil and other measurements.
Specific practices must be outlined for standardized measurements.
Sealed collection containers with limited head space is required.
Drying temperature and times for moisture and standard practice for other measurements must be determined.
Chapter 4: Corrosion testing
(shared using VisualBee)
1. Chapter 4: Corrosion testing
Nima Safara
4-1 to 4-8
Picture Reference: http://www.mistesting.co.uk/corrosion_testing.html
2. Introduction
• Many tests are made every year but the value
and reliability of the data obtained depend on
details involved.
• Most tests are made with a specific objective in
mind, some are educational and some are made
for practical proposes.
• well-planned and executed tests usually result in
reproducibility and reliability.
• Corrosion tests and application of the results are
considered to be a most important aspect of
corrosion engineering.
3. Classification
1. Laboratory tests.
2. Pilot-plant or semi works tests.
3. Plant or actual service test.
4. Field tests.
4. 1-Laboratory tests, including
acceptance or qualifying tests
• These tests are characterized by small
specimens and small volumes of solutions
• Best that can be done is the use of actual
plant solutions or environment
• It is not good idea to build a plant just based
on laboratory tests
5. 2-Pilot-plant or semi works tests
• These tests are usually the best and the most
desirable
• Tests are made in small-scale plant that
essentially duplicates the intended large-scale
operation
• Pilot plants are usually run long enough to ensure
good results
• One possible disadvantage is that conditions of
operation may be widely varied in attempting to
determine optimum operation
6. 3-Plant or actual service test
• Involves in a particular service or a given plant
7. 4-Field tests
• Involves field tests designed to obtain more
general information
• Example of field tests are atmospheric
exposure of a large number of specimens in
racks at one or more geographical locations
and similar tests in soils or seawater.
8. Purposes:
main justification for corrosion testing
1. Evaluation and selection of materials for a
specific environment or a given definite
application
2. Evaluation of new or old metals or alloys to
determine the environments in which they are
suitable
3. Control of corrosion resistance of the material or
corrosiveness of the environment
4. Study of the mechanisms of corrosion or other
research and development purposes
9. Materials and Specimens
• First step in corrosion testing concerns the
specimens themselves.
• If complete information on the materials is
not known, the data obtained may be
practically useless.
• If particular shapes are involved,
representative material should be tested.
10. Size and shape of specimen
• Flat samples are usually preferred because of
easier handling and surface preparation.
• Specimens 1/16 to ¼ inch thick, 1 inch wide, and
2 inch long are commonly employed in laboratory
tests.
• For wrought specimens, a large ratio of rolled
area is desirable.
• one reason of using thin specimens is,
experiment shows the cut edge might corrode
twice as fast as the rolled surface and accordingly
results in misleading answers.
11. Small specimens
• Small samples permit more accurate weighing
and measuring of dimensions
• Short time tests
• Low corrosion rate
12. Large Samples
• Large sample are desirable when studying
pitting corrosion because of the probability
factor involved
13. Surface preparation
• Surface of the test specimen should be
identical with the surface of the actual
equipment to be used in the plant.
• A common and widely used surface finish is
produced by polishing with No. 120 abrasive
cloth or paper or its approximate equivalent.
• This is not a smooth surface, but it is not
rough.
14. Surface preparation
• Excessive heating of the specimen should be
avoided, a good general rule is that the
specimen could at all time be held by naked
hand
• The edges must be machined, filed, or ground
to remove the severely cold-worked metal and
subsequently finished similarly to the
remainder of the specimen.
15. Surface preparation
• For soft metals like lead and lead alloys
rubbing with a hard eraser until obtaining a
bright surface is recommended.
• Scrubbing with pumice powder and other fine
abrasives is sometimes used on magnesium,
aluminum and their alloys.
16. Measuring and Weighing
• Since surface area enters in the formula for
calculation of the corrosion rate, the results
can be no more accurate than the accuracy of
measurement of surface area.
• After measuring, the specimen is degreased,
dried and weighted to nearest 0.1 mg
17. Consideration on Exposure Techniques
1. The corrosive should have easy access to the
specimen.
2. The support should not fail during the test.
3. Specimens should be insulated or isolated
electrically from contact with another metal
unless galvanic effects are intended
18. Consideration on Exposure Techniques
4. The specimen should be properly positioned
if effects of complete immersion, partial
immersion, or vapor phase are being studied
5. For plants tests, the specimens should be as
readily accessible as possible.
19. Corrosion tests: Boiling tests
• The specimen is held in a glass cradle to
permit circulation of the corrosion.
• The flask is an ordinary 1000 ml wide-mouth
Erlenmeyer.
• The condenser is called an acorn or finger type
condenser.
• An important consideration for boiling tests is
to be sure that sufficient heat is available to
cause boiling is all the flasks.