塩化物溶液中における亜鉛のアノード溶解

概要

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It was investigated that the kinetic parameters on the anodic dissolution mechanism of zinc in chloride solution with the measurement of anodic polarization. The following results were found. (1) The reaction rate of zinc anodic dissolution is proportional to the third order against the concentration of Cl^- ion and to the zero order against that of OH^- ion in the neutral solution (pH=5∿8). In this case, it is found that the Tafel slope of i (current density) -φ(potential) curve is nearly equal to 17 mV/decade. That is, the concentration of Cl^- ion gives a great effect to the reaction of zinc anodic dissolution in the neutral solution. (2) The reaction rate of zinc anodic dissolution is proportional to the zero order against the concentration of Cl^- ion and to the third order against that of OH^- ion in the alkali solution (pH=12.5∿13.5). In this case, it is found that Tafel slope of i-φ curve is nearly equal to 40 mV/decade. That is, the concentration of OH^- ion has great influence on the reaction of zinc anodic dissolution, which is unaffected by that of Cl^- ion, in the alkali solution.
社団法人日本鉄鋼協会の論文
1992-04-01