Abstract
The effect of Cr and Mo in on the metastable pitting behavior of Ni-Cr-Mo alloys of various compositions was studied through analysis of transients captured in current-time records produced during potentiostatic polarization in hot chloride solutions. It was found that the total number of metastable pitting events decreases with an increasing amount of Cr and Mo, with Mo exerting a more potent effect. As Mo concentration increases, the peak current of metastable pits decreases. Additionally, the growth rate of the fastest growing pits was slowed as alloying Mo content increased. Chromium additions, on the other hand, were found to act in suppressing pitting by increasing pit repassivation rates.
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