What is IGC testing (A262 Practice E). Explain?

IGC Testing as per A262 Practice E

IGC testing A262 Practice E refers to a standard test method used to evaluate the intergranular corrosion (IGC) resistance of stainless steel and high-alloy materials. This test method, described in Practice E of ASTM International standard A262, involves immersing specimens of the material in a solution of nitric acid and ferric nitrate. The solution is used to simulate the corrosive environment that can cause IGC in some materials. The appearance of the specimens is then evaluated to determine the degree of intergranular corrosion that has occurred.

Intergranular corrosion is a type of corrosion that occurs along the grain boundaries of a material. It can be caused by a variety of factors, including improper heat treatment, the presence of impurities in the material, or exposure to a corrosive environment. The A262 Practice E test is used to evaluate the susceptibility of a material to IGC and is commonly used in the aerospace, chemical processing, and petroleum industries, among others.

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