Er对Al-Zn-In合金组织和电化学性能的影响

Effect of Er on Microstructure and Electrochemical Performance of Al-Zn-In Anode

采用SEM、EDS和XRD等方法,研究了不同Er含量对Al-Zn-In阳极合金组织的影响;在3.5%(质量分数)Na Cl溶液中测试了不同Er含量的Al-5Zn-0.03In-Er合金的极化曲线和电化学阻抗(EIS)。结果表明:随着Er含量的增加,铝合金阳极枝晶得到细化,枝晶间析出相增多,合金腐蚀电位正移,EIS谱中阻抗弧半径增大,腐蚀速度减缓。4种合金中,Al-5Zn-0.03In-1Er合金枝晶得到一定程度细化、析出相数量适中,点蚀坑较为独立,呈现均匀腐蚀的特征,可作为阳极合金材料。

The effect of Er content on microstructure of Al-Zn-In alloy anodes were studied by scanning electron microscopy（SEM）,energy spectrum analysis and X-ray diffraction analysis.The polarization curves and EIS of Al-Zn-In alloy with different Er contents were tested in the 3.5wt% Na Cl solution.The results show that with the increase of Er content,the dendrite of Al-Zn-In alloy anodes is refined,the amount of inter-dendritic precipitates increases,the corrosion potential becomes more positive,the radius of electrochemical impedance spectroscopy enlarges while the corrosion rate decreases.Al-5Zn-0.03In-1Er alloy possesses refined dendrites and a proper amount of precipitates,with independent pitting and uniform corrosion,which is an ideal sacrificial alloy.