Abstract
The initial repassivation processes of anodic reaction on the newly created surfaces of 75%Ni-0∼15%Cr-25∼9%Fe alloys were investigated by a rapid straining electrode technique in a 0.4%NaOH solution at 553 and 598 K at constant anodic potentials. The results obtained are as follows:(1) The decrease in current density with time after rapid straining was stopped follows the formula of i∝t−n(i: current density, t: time, n: constant) over a time range of about 20∼1000 ms.(2) The effects of chromium contents in the range of 0–15 mass% on the repassivation rate is small at any potentials of −0.90∼0 V. This suggests that the influence of chromium depleted zone on the caustic SCC of Alloy 600 should be small.
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