退火温度对Al-Zn-Bi-Mg-RE合金电化学性能的影响
Effect of Annealing Temperature on Microstructure and Electrochemical Performance of Al-Zn-Bi-Mg-RE Alloy
郝庆国1, 文九巴1,2, 贺俊光1, 马景灵1
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作者单位：1.河南科技大学 材料科学与工程学院, 河南 洛阳 471003; 2. 河南省有色金属材料科学与加工技术重点实验室, 河南 洛阳 471003)
中文关键字：Al-Zn-Bi-Mg-RE合金； 热处理温度； 电化学性能； 电化学阻抗谱
英文关键字：Al-Zn-Bi-Mg-RE alloy; heat-treatment temperature; electrochemical performance; electrochemical impedance spectroscopy
中文摘要：采用金相显微镜、恒电流法、动电位极化法和电化学阻抗谱(EIS)技术研究了退火温度对Al-Zn-Bi-Mg-RE阳极合金微观组织和电化学性能的影响。结果表明：随退火温度的升高，合金的晶粒有长大的趋势，体积也逐渐球化，第二相弥散均匀分布于晶界和晶内；合金的电流效率提高，开路电位正移，工作电位更加稳定；在一定热处理温度范围内，随温度的升高，合金的电化学性能有所改善，经510 ℃× 4 h保温并炉冷后的试样综合性能最好。
英文摘要：The influences of annealing temperature on microstructure and electrochemical performance of Al-Zn-Bi-Mg-RE alloy anode were investigated by OM, constant current, polarization curves and electrochemical impedance spectroscopy (EIS) methods. The results show that there is a trend that the grain sizes of the alloy become larger and spheroidizer gradually and the second phase also evenly distributes in the grain boundaries with the annealing temperature increasing. The current efficiency of the alloy can be raised, open circuit potential shifts toward positive and working potential becomes more stable. In a certain heat-treatment temperature range, the alloy annealing at 510 ℃ for 4 h has better electrochemical performance.