(1. 上海交通大学 材料科学与工程学院 上海市镁材料及应用工程技术研究中心，上海 200240；
2. 上海交通大学 材料科学与工程学院 金属基复合材料国家重点实验室，上海 200240)
摘 要: 采用恒温浸泡、交流阻抗和极化曲线法分别研究铸态(F)和固溶态(T4)的NZ30K以及挤压态AZ31镁合金在不同浓度MgCl2、MgSO4、Mg(COOCH3)2、MgBr2溶液中的腐蚀行为和电化学性能。结果表明：随着电解液中电解质浓度的增加，3种镁合金的自腐蚀速率均增大。F态和T4态的NZ30K合金在MgSO4溶液中腐蚀速率最快，在MgBr2溶液中耐蚀性能最好，而AZ31合金在MgCl2溶液中耐蚀性能最差，在MgSO4和Mg(COOCH3)2中具有较好的耐蚀性能。电化学阻抗谱(EIS)结果表明：在4种电解液中，镁合金的高频端容抗环半径均随着电解质浓度的增加而减小，这与恒温浸泡的实验结果相吻合。
关键字: AZ31合金；NZ30K合金；腐蚀行为；电化学性能
anode materials for magnesium battery
（1. Shanghai Engineering Research Centre of Magnesium Materials and Application,
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering,
Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The corrosion behavior and the electrochemical performance of NZ30K alloy of as-cast(F) and solution-treatment conditions(T4), and AZ31 alloy of as-extruded condition were investigated in MgCl2, MgSO4, Mg(COOCH3)2 and MgBr2 solution with different molar concentrations by means of immersion test at constant temperature, alternating current impedance and polarization curve. The results show that the corrosion rates of three kinds of Mg alloys increase with the increase of the electrolyte concentration. The corrosion rate of NZ30K alloy in F and T4 conditions in MgSO4 solution is the highest, and that in MgBr2 solution among the researched electrolytes is the lowest. Whereas, AZ31 alloy shows the worst corrosion resistance in MgCl2 solution and the best corrosion resistance in MgSO4 and Mg(COOCH3)2 solution. The results of electrochemical impedance spectroscopy(EIS) show that radius of high frequency capacitive loop of Mg alloys decreases with the increase of the electrolyte concentration, which is consistent with the results of immersion test at constant temperature.
Key words: AZ31 alloy; NZ30K alloy; corrosion behavior; electrochemical performance
