Problems in Utilizing ASTM G 48 to Evaluate High-Alloy Stainless Steels

Abstract The ASTM G 48 test evaluates an alloys resistance to pitting and crevice corrosion using severe test conditions. Unlike most other ASTM standards which are cut and dry in their test procedures, this standard has loop holes which allows test-to-test and laboratory-to-laboratory variation which makes comparison of data difficult. Modifications are often used to improve the standard, but these are not adopted universally. This paper identifies the problems associated with using G 48, and the impact these problems have on evaluating high-alloy stainless steels. Recommendations to correct these problems to standardize the test are made. Attention to the use of electrochemical measurement techniques for improved reproducibility are discussed.