文档介绍：
镧基转化膜对 AZ63 镁合金耐蚀性能的影响
王宁宁1,陈琳1,2,陈昌国1,王继敏1**
(1. 重庆大学化学化工学院,重庆 400044;
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2. 四川理工学院材料与化学工程学院,四川自贡 643000)
摘要:镁的标准电极电位很负(- V SHE),理论比容量大(2205mA h/g),是较好的负极材
料。但由于镁合金自腐蚀电位低,具有较高的化学活性,表面极易被腐蚀。本文采用 Tafel 极
化曲线(LSV)、扫描电镜(SEM)和电化学阻抗谱测试(EIS)研究了在 3%氯化钠溶液中,镧基转
化膜对 AZ63 镁合金的耐蚀性能的影响。试验结果表明:经硝酸镧溶液浸泡成膜后的镁合金
耐蚀性能增强,所形成的镧基转化膜较为致密。当硝酸镧浓度为时,镁合金耐蚀
效果最好。
关键词:稀土转化膜;镁合金;腐蚀与防护
中图分类号:
Lanthanum conversion coatings on AZ63 magnesium alloy
for corrosion protection
Wang Ningning1, Chen Lin1,2, Chen Changguo1, Wang Jimin1
(1. College of Chemistry and Chemical Engineering, Chongqing University, ChongQing 400044;
2. College of Material and Chemical Engineering, Sichuan University of Science and Engineering,
SiChuan ZiGong 643000)
Abstract: Magnesium is a perfect anode material because of the low standard electrode potential
(- V vs SHE) and the large theoretical specific capacity (2205mAh g-1). Because the
magnesium alloy corrosion potential is low, its chemical activity is high and the surface is easily
corroded. This paper studies the lanthanum film on the surface of AZ63 magnesium alloy in 3%
NaCl solution. Inhibition of lanthanum conversion coatings on AZ63 magnesium alloy surface
was investigated by Tafel polarization curves (LSV), scanning electron microscopy (SEM), and
electrochemical impedance spectroscopy (EIS). Th