Various stress corrosion tests have been carried out on a 3CrMo steel in ammonium acetate solution. Intergranular cracking has occurred at both the molar and 0.1 molar levels. Other acetates show characteristics favoring stress corrosion. It has been found that phosphate additions inhibit both crack initiation and propagation in constant strain tests. The susceptibility to cracking and the form of cracking have been found to be dependent upon the type of test used. The results suggest that the control of pH and potential is essential for testing in aggressive solutions.

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© 1974 National Association of Corrosion Engineers
1974
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