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.

Subject
Composition, Cathodic potential, Corrosion detection, Constants, Corrosion attacks, Current densities, Heat, Steel, Sensitization, Grain boundary, Intergranular corrosion, Heat treatment, Polarization cells
© 1975 National Association of Corrosion Engineers
1975
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