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使用扫描微电极技术研究了黄铜-16Mn钢电偶体系在不同浓度氯化钠溶液中表面电位和电流的分布情况.研究发现,表面电位和电流分布随溶液浓度和与连接点的距离而变化.溶液浓度越大,两者分布就越均匀;与连接点距离越近,电位极化就越大,电流密度也越大.腐蚀形貌观测也支持了电位和电流分布的结果.实验结果表明,在低浓度的溶液中,电偶腐蚀会集中在连接点周围,造成严重的局部腐蚀.随着溶液浓度增大,腐蚀分布变得均匀.
Using scanning microelectrode technique, the distribution of surface potential and current in brass-16Mn galvanic couple system at different concentrations of sodium chloride solution was studied. It was found that the surface potential and current distribution varied with the solution concentration and the distance from the junction The larger the solution concentration, the more uniform the distribution of the two, the closer the connection point, the greater the potential polarization and the higher the current density.The corrosion morphology also supports the results of the potential and current distribution.The experimental results show that In low concentration solutions, galvanic corrosion concentrates around the connection points, causing severe localized corrosion, which becomes uniform as the solution concentration increases.