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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。
The effects of annealing temperature on the microstructure and electrochemical properties of Al-Zn-Bi-Mg-RE anode alloys were investigated by optical microscope, galvanostatic method, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) The results show that as the annealing temperature increases, the grain size of the alloy grows and the volume gradually increases. The second phase disperses uniformly in the grain boundaries and grains. The current efficiency of the alloy increases, the open circuit potential shifts forward, The working potential is more stable. The electrochemical performance of the alloy is improved with the increase of temperature in a certain temperature range. The best properties of the samples after being heat-treated at 510 ℃ × 4h and cooled by the furnace are the best.