A comparison is presented of the results of intergranular (IG) corrosion testing by the standard method (ASTM A 262, Practice E) and by an electrochemical reactivation method. Five Cr-Ni and Cr-Ni-Mo steels containing 0.025 to 0.09% C were tested. Discrepancies between the classical and the electrochemical test are accounted for by the fact that the reactivation method detects both continuous and local chromium-depleted areas in the steel structure, whereas the classical test reveals only continuous depletion zones leading to IG corrosion.
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Novák et al. (1975) studied this question.