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本文采用动电位扫描方法研究了硫酸盐水溶液中的金属Ni阳极过程。金属Ni阳极溶解与钝化表现为电荷传递分步进行、并以失去第一个电子的电化学反应为控制步骤的不可逆电极过程。金属Ni阳极正常溶解速度与电解质溶液组成浓度无关,而钝化是由于阳极极化电位较高时失去第二个电子的电化学反应直接生成固态NiO成相膜复盖电极表面所引起。综合实验研究事实和理论分析结果,本文提出了金属Ni阳极溶解与钝化反应的可能机理。
In this paper, the dynamic anodic scanning method was used to study the metal Ni anode in aqueous sulfate solution. Metal Ni anode dissolution and passivation showed charge transfer step by step and lost the first electron electrochemical reaction as the control step of the irreversible electrode process. The normal dissolution rate of metal Ni anode has nothing to do with the concentration of electrolyte solution, and passivation is caused by the electrochemical reaction of losing the second electron when the anode polarization potential is higher, which directly generates solid NiO phase film covering electrode surface. Based on the factual and theoretical analysis results, the possible mechanism of metal Ni anode dissolution and passivation reaction is proposed.