CREVICE CORROSION REPASSIVATION TEMPERATURES OF HIGHLY ALLOYED STAINLESS-STEELS

An investigation was conducted to study the repassivation temperature of a highly alloyed austenitic (UNS S31254) and of a highly alloyed du plex (UNS S32750) stainless steel (SS). When initiated at a high tempe rature, repassivation occurred at a temperature level significantly lo wer than normally associated with initiation of crevice corrosion. Exp erimental results combined with computer modeling of crevice corrosion explored the mechanistic aspects. In this respect, the similarity bet ween the hysteresis observed by cyclic polarization and cyclic tempera ture tests was emphasized.