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用旋转环一盘电极、电子探针和形貌分析等手段研究了铝基牺牲阳极的溶解过程及其负差异效应。结果表明,铝基牺牲阳极的溶解是从第二相组织边界处引发,从而破坏表面膜而活化。阳极溶解过程中的自腐蚀(表现为析氢)是负差异效应的主要原因,它随外加电流而线性增大。铝基牺牲阳极的负差异效应系数为12.8%。
The dissolution process and the negative difference effect of the sacrificial aluminum anode were studied by means of a rotating disk electrode, electron probe and morphology analysis. The results show that the dissolution of the aluminum-based sacrificial anode is initiated from the boundary of the second phase structure and thus the surface film is destroyed and activated. Self-corrosion (expressed as hydrogen evolution) during anodic dissolution is the main cause of negative differential effects, which increases linearly with applied current. The negative difference effect coefficient of aluminum sacrificial anode is 12.8%.