Intergranular corrosion occurs as a result of precipitation of nitrides , carbides , and other intermetallic phases , such as sigma phase, that occurs along the grain boundaries. If materials with incorrect heat treatment enter service, they are liable to crack or fail by intergranular corrosion IGC much more rapidly than properly treated materials; ASTM A is a screening test to help find batches that are incorrectly processed. Intergranular corrosion shows up as the dark black lines around the grain boundaries. How do you select the right ASTM corrosion testing method for your material? The first and fastest step is the ASTM A Practice A, a rapid same-day screening method in Oxalic acid to determine the susceptibility to intergranular corrosion. Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required.
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Follow us:. Methods for preparing the test specimens, rapid screening tests, apparatus setup and testing procedures, and calculations and report contents are described for each testing practice.
The etch structure types used to classify the specimens are: step structure, dual structure, ditch structure, isolated ferrite, interdendritic ditches, end-grain pitting I, and end-grain pitting II.
Intergranular Corrosion Testing: An Overview of ASTM A262
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