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0.5mol L~(-1)H_2SO_4溶液中高纯铁电极在短时间阳极钝化后再向阴极方向扫描时可测出阴极还原电量,这主要是由于氧化膜的还原引起的,极少量Cl~-能使阴极还原电量明显减少。Cl~-的主要作用是阻滞钝化膜的形成并使钝化膜稳定性下降。
In the 0.5mol L -1 H_2SO_4 solution, the high-purity iron electrode can be measured in the cathode direction after anodic passivation in a short time, which is mainly due to the reduction of the oxide film. A very small amount of Cl ~ Cathode reduction can make a significant reduction in electricity. The main function of Cl ~ - is to block the formation of passivation film and to reduce the stability of passivation film.