ASTM a Test, Intergranular Corrosion, IGC, ASTM A Practice, Testing, India Ferric Sulfate – Sulfuric Acid, ASTM A – Practice B (Streicher Test). ASTM A practice – Free download as Excel Spreadsheet .xls /.xlsx), PDF File .pdf), Text File .txt) or read online for free. ASTM A Practice B test. In this test a sample of surface area cm. 2 is exposed for a period of hours to boiling solution of 50% H2SO4 + %.

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ASTM A Testing: An Overview of Intergranular Corrosion | Element

This website uses cookies to improve user experience. Metals like stainless steels and aluminum contain elements such as niobium and chromium, often integrated because of their natural corrosion resistance. The samples are etched after metallographic preparation for cross-sectional examination which is thoroughly viewed with a traverse from inside to outside diameters of rods and tubes, practiice face to face on plates, and across all zones such as weld metal, weld-affected zones, and base plates on specimens containing welds.

What is your typical turnaround time? Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.

The level of corrosion is determined by mass loss. How do you select the right ASTM corrosion testing method for your material? Please share this page: The oxalic acid test is commonly used before the Strauss test to determine if a sample is susceptible; samples that pass method A will generally show low corrosion rates in the Strauss test.


This method is a hour boiling test for “as received” specimens of stainless steel.

Typical examination magnification is X to X. By using our website you consent to all cookies in accordance with our Cookie Policy. From macroscopic imaging to Scanning Electron Microscopy, Element provides turnkey ptactice services using state-of-the-art equipment. The Huey test works well to analyze chromium depleted regions and intermetallic precipitates, such as sigma phase, and is also used for materials in strongly oxidizing environments such as nitric acid.

Choosing the correct method s rely on a complete understanding of your material and processes, as well as the concept of corrosion itself. Practics practices include five intergranular corrosion tests, namely: Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain stainless steel grades to ensure aetm are not susceptible to intergranular pracctice sensitization. G2MT Labs is one of the few labs to offer all five ASTM A corrosion testing practices, as well as the expertise to help you determine which tests to use, what to do if a test fails, and other corrosion consulting as needed.

See Appendix X1 for information regarding test selection. Share on Tumblr Print. ASTM A testing is a popular method of choice due to the variety of practices available and the relatively short turnaround for results.

The chart below comes from the Practife A standard for selection of the appropriate test by alloy type:. A recent publication on intergranular corrosion. Carbon and Sulfur Analysis. Classification atsm structure then provides either acceptance or further testing required, which typically moves you to one of the next practices. The Oxalic Acid test is also only applicable to corrosion associated with chromium carbide precipitates and is only useful for specific material grades.


Sensitization causes the grain boundaries of a material to precipitate, creating carbide deposits and causing the material to be susceptible to pfactice attack. This pdactice is a brief summary of the referenced standard.

A bend test followed by a visual or micro-examination are used to determine “Pass” or “Fail” of test specimens. Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance.

It is typically used for stainless alloys such as andCr-Ni-Mo stainless alloys, and nickel alloys to evaluate the intergranular attack associated with the precipitation of chromium carbides at grain boundaries.

Intergranular Corrosion Testing: An Overview of ASTM A262

Discover perspectives, resources, and advice from our world-leading Engaged Experts. Choosing an Intergranular Corrosion Test Method Since high temperature processing such as heat treatment is a common practice, many manufacturers wish to perform intergranular corrosion qualification testing on each batch, to ensure that the material has been processed correctly and does not show signs of corrosion susceptibility.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Rockwell or Superficial Hardness. Practice A is a rapid screening examination of the microstructure to quickly determine if the structure is certain to be free of susceptibility to rapid intergranular attack. Work Item s – proposed revisions of this standard.