摘要
Electrochemical impendence spectroscopy （EIS） is applied to investigate the dissolution behavior of Al-Zn alloys in 3% NaCl solution at different polarization potentials. A new reaction model is proposed, and the activation mechanism of zinc in Al-Zn alloys is achieved. There are three intermediates in the dissolution process： Znad^＋, Znad^2＋ and Alad^＋, ,of which only Zni can activate Al-Zn alloys. Most Znnd^＋ is produced by β-phase,and the alloys with 2. 3% - 3. 8% （wt） Zn dissolve rapidly. The Al-Zn alloys of heart-shaped EIS are active in 3% NaCl solution, thus EIS characteristic can be used to distinguish the activa-tion of Al-Zn alloys.
基金
National Natural Science Foundation of China(Nos.51204147,51274175,51574206,51574207)
Program for International S&T Cooperation Projects of China(No.2014DFA50320)
Program for International S&T Cooperation Projects of Shanxi Province(No.201381017)
Technological Projects of Shanxi Province(No.20150313002-3)
