Ni-based alloys typically exhibit superior corrosion resistance in chloride containing solutions as compared to Fe-based alloys. To explore the electrochemical factors underlying these differences, the localized dissolution behavior and repassivation response of Ni-rich Alloy 600 and Fe-rich A286 are evaluated under pitting-like conditions. Downward potential scans at fixed temperature are conducted using 1D pit samples to characterize activation-controlled dissolution kinetics and repassivation potentials. In addition, temperature-decreasing potentiostatic experiments are performed to determine the repassivation temperature. The results are interpreted in terms of how the difference of Ni and Fe contents influence dissolution behavior and repassivation characteristics.
