The electrochemical potentiokinetic reactivation behavior of Alloy 600

The characteristics of reactivation polarization behavior of Alloy 600 in 0 .5 M H2SO4 + 0.005 M KSCN solution were investigated. The feasibility of si ngle-loop electrochemical potentiokinetic reactivation (SL-EPR) test techni que for the evaluation of the degree of sensitization (DOS) was also explor ed. The experimental results showed that both sensitized and unsensitized m aterials exhibited reactivation curves with two separated anodic peaks. The results of reactivation termination tests showed that the anodic peak whic h appeared at -50 mV (SCE) was associated with the depassivation of grain m atrix, while that at + 100 mV (SCE) was corresponding to the grain boundary corrosion for sensitized Alloy 600. The anodic peak at more noble potentia l in the EPR curve might also reflect the occurrence of pitting corrosion o f Alloy 600 in the testing electrolyte. (C) 2001 Elsevier Science B.V. All rights reserved.