硫酸塩溶液中における不働態ニッケルの溶解機構

抄録

The effects of the concentrations of hydrogen-, nickel- and sulfate-ion were investigated in the potential-independent dissolution of passive nickel in sulfate solution. The observed dissolution current i_A decreased with the increase of pH in the acidic region, logi_A=k−0.46 pH, and was independent of the concentrations of either nickel ion or sulfate ion. In the alkaline solution, on the other hand i_A increased with increasing pH. These results were analysed in terms of the electrochemical kinetics and the following mechanisms were proposed for either region, respectively:
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