铝合金在铈盐溶液中成膜过程的电化学阻抗谱研究Cerium(Ⅲ) Film Formation Process for Aluminum Alloys Observed with Electrochemical Impedance Spectroscopy
顾宝珊;刘建华;
摘要(Abstract):
应用电化学阻抗谱(EIS)研究B95铝合金在0.01 mol.L-1CeCl3溶液中铈盐转化膜的形成过程和机制。结果表明:EIS变化可以清楚地显示B95铝合金在铈盐溶液中成膜的动态过程,稀土转化膜的成膜过程可以分成形成、成长和稳定平衡3个阶段;形成阶段以Al合金的溶解为主;在成长阶段随着时间的增加,转化膜不断增厚,铝合金基体的溶解已经被抑制;稳定平衡阶段,膜的成长与溶解已经达到平衡,通过EIS解析表明自然条件下生成的转化膜不致密,该阶段阻抗谱图等效电路与成长阶段相同,但阻抗谱包含两个时间常数;在成膜三阶段基础上提出了稀土转化膜的成膜模型;同时给出各阶段阻抗谱图等效电路及其阻抗表达式。
关键词(KeyWords): 铝合金;交流阻抗谱;Ce转化膜模型;成膜过程;稀土
基金项目(Foundation):
作者(Authors): 顾宝珊;刘建华;
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