钛金属表面微弧氧化的电击穿行为

Electrical Breakdown Behavior of Titanium Surface During Micro-Arc Oxidation

通过研究微弧氧化时电极表面的电压和击穿电压与时间、溶液浓度及施加电流密度的关系,考察了钛金属在不同电解质溶液中微弧氧化时电极的表面电击穿行为。结果表明:微弧氧化过程中电极电压随时间呈不规则的锯齿型变化;在两种电解质溶液中,溶液浓度越大,电压越低;陶瓷膜表面的击穿电压随着电解质溶液浓度的增加呈指数规律衰减;电解质溶液浓度一定时,击穿电压与微弧氧化时所施加的电流密度没有明显关系。

By analyzing the voltage and breakdown voltage of titanium surface in the micro-arc oxidation process varying with the time, the solution concentration and the applied current density, the surface electrical breakdown behaviors of titanium in different electrolyte solutions are investigated. The results show that （ 1 ） in the micro-arc oxidation process, the electrode voltage uniformly and crenellatedly varies with the time and decreases with the increase in concentrations of two electrolyte solutions; （2） the breakdown voltage of the ceramic membrane surface exponentially decays with the increase of solution concentration; and （3） at a certain solution concentration, the breakdown voltage has no obvious relation to the applied current intensity.