贺俊光,文九巴,周旭东

• 1:河南科技大学材料科学与工程学院

摘要(Abstract)：

通过分析Al-7Zn-0.1Sn-0.015Ga(质量分数,%)合金在3.5%NaCl溶液中的点蚀形貌及电化学阻抗谱(EIS)研究该合金的点蚀行为及扩展机理。结果表明:该合金析出相界面处由于Cl-吸附和微电池的共同作用优先溶解引发点蚀。蚀孔内金属离子浓度增加,Cl-向孔内迁移导致孔内Cl-浓度升高,同时孔内金属离子水解使孔内H+浓度升高,蚀孔迅速纵深发展。随着析出相溶解及孔深增加,腐蚀产物在蚀孔处堆积造成金属离子传质阻力增大,产生浓差极化导致蚀孔底部电位正移,纵向腐蚀速率减慢;回沉积在蚀孔处的Ga和Al形成Ga-Al汞齐,分离氧化膜使铝基体不断溶解,也使腐蚀产物不断脱落,使点蚀坑横向扩展。

关键词(KeyWords)： 铝合金;牺牲阳极;电化学阻抗谱;点蚀行为;点蚀机理

Abstract:

Keywords:

基金项目(Foundation): 河南省科技创新杰出人才计划(094200510019);; 河南省自然科学基金项目(092300410132)

作者(Author): 贺俊光,文九巴,周旭东

DOI: 10.13289/j.issn.1009-6264.2013.08.009

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