中文摘要：

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．

英文摘要：

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.