Sn对AP65镁阳极显微组织和电化学性能的影响  

Influence of Sn on Microstructures and Electrochemical Properties of AP65 Anodes

作　　者：金和喜[1] 王日初[1] 彭超群[1] 冯艳[1] 石凯[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2011年第5期97-101,共5页Mining and Metallurgical Engineering

基　　金：国家攻关项目(MKPT-02-181)资助

摘　　要：采用熔炼法制备了Mg-6%Al-5%Pb-Sn镁阳极材料。采用金相显微镜(OM)、扫描电镜(SEM)、浸泡法、恒电流极化法和动电位扫描法分别研究了不同Sn含量对AP65镁阳极显微组织和电化学性能的影响。结果表明:加Sn后镁阳极显微组织中产生条形Mg2Sn相,主要分布于基体晶界,且Mg2Sn相含量随着Sn含量增加而增多;Mg-6%Al-5%Pb-2.0%Sn镁阳极析氢速率、失重速率、自腐蚀速率最小,而腐蚀电位、腐蚀电流密度、工作电位和阳极使用效率最高。随着Sn含量增加,镁阳极腐蚀微裂坑和腐蚀产物减少,镁阳极溶解速率降低。Mg-6% Al-5% Pb-Sn anodes were prepared by fusion metallurgy. The effects of Sn contents on the microstructures and electrochemical properties of AP65 anodes were examined by optical microscopy （OM） , scanning electronic microscopy（SEM） , immersion tests, galvanostatic polarization and potentiodynamic scanning technique. Results reveal that strip-like MgESn phase occurs in the microstructure of the anode after the addition of Sn and mainly distributes along the grain boundaries and increases with the increase of Sn content. The hydrogen evolution rate, mass loss rate and self-corrosion rate of the Mg-6% Al-5% Pb-2.0% Sn anode are the lowest among all samples, while its corrosion potential, corrosion current density and operating potential are the highest. The micro-cracks, corrosion products and dissolving rates of the magnesium anodes decrease with the increase of Sn content.

关 键 词：阳极材料 AP65 镁阳极 Mg2Sn相 显微组织 电化学性能 

分 类 号：TG174[金属学及工艺—金属表面处理]