模拟偏析相Al_2Zn在3% NaCl溶液中的电化学行为  

ELECTROCHEMICAL BEHAVIOR OF THE SIMULATED Al_2Zn SEGREGATION IN 3% NaCl SOLUTION

作　　者：刘斌[1] 齐公台[1] 冉伟[1] 赵婷婷[1] 

机构地区：[1]华中科技大学化学系,武汉430074

出　　处：《中国腐蚀与防护学报》2007年第2期93-96,共4页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(50671041)

摘　　要：根据Al-Zn-In合金中偏析相Al2Zn的元素组成熔炼出模拟偏析相合金,测试了模拟偏析相合金和Al-Zn-In合金的自腐蚀电位、极化曲线和交流阻抗谱.结果表明:相对于Al-Zn-In合金,模拟偏析相Al2Zn自腐蚀速率小,自腐蚀电位负,呈现阳极性;Al-Zn-In合金中的偏析相Al2Zn与合金基体构成微区电偶腐蚀,受到阳极极化优先溶解,引起阳极电流效率的损失.Simulated Al2Zn segregation alloys were developed according to the average elements distribution of zinc enriched zones of Al - Zn - In alloy. Open circuit potential against time, polarization curves, and electrochemical impedance spectroscopy were employed to study the electrochemical behavior of Al - Zn - In and simulated Al2Zn alloys. The results showed that the simulated Al2Zn alloy exhibits a more electronegative open circuit potential and a lower self-corrosion rate as compared with those of Al- Zn -In alloy. However,the Al2Zn segregation in Al- Zn - In alloy can be attributed to the formation of micro - local galvanic corrosion that leads to the preferential dissolution of Al2Zn and the loss of current efficiency.

关 键 词：Al-Zn-In Al2Zn偏析相 电化学行为 电流效率 

分 类 号：TG174.41[金属学及工艺—金属表面处理]