稀土镁合金、AZ31及AZ91负极材料耐腐蚀性能及放电行为的比较

Comparison of Corrosion Resistance and Discharge Behavior of Rare Earth Magnesium Alloy, AZ31 and AZ91 Negative Electrode Materials

通过对动电位极化曲线、电化学阻抗谱图、SEM形貌的分析,研究了AZ31、AZ91和稀土镁合金在8.0%（质量分数）NaCl溶液中的腐蚀行为。并将上述三种镁合金组装成电池,在8.0%Na Cl溶液中进行恒流放电测试。结果表明：三种负电极的耐蚀性是稀土合金〉AZ31〉AZ91;浸泡48 h后稀土镁合金的表面裂纹最少,腐蚀程度最轻,而AZ91负极的腐蚀程度最严重,表面裂纹较深;稀土合金的放电时间最长,达到800 min,AZ31为710 min,AZ91为660 min。

The corrosion behaviors of AZ31, AZ91 and rare earth magnesium alloys in 8.0% Na Cl solution were investigated by potentiodynamic polarization curve, electrochemical impedance spectroscopy（EIS） and scanning electron microscopy（SEM）. The above three magnesium alloys were assembled into batteries. The constant current discharge test in8.0% Na Cl solution was carried out. The results show that the corrosion resistance of the three kinds of negative electrode is rare earth alloyAZ31AZ91. The surface crack of rare earth magnesium alloy is the least and the corrosion degree is the lightest after immersion for 48 h. However, the corrosion of AZ91 negative electrode is the most serious, and the surface crack is deeper. The discharge time of the rare earth alloy is the longest, reaching 800 min, AZ31 is 710 min, and AZ91 is 660 min.