镁海水电池阳极活化机理研究  

Mechanism of Activation of Anode of Mg Alloy Seawater Battery

作　　者：马正青[1] 庞旭[1] 左列[1] 曹琳[1] 曾苏民[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：《表面技术》2008年第1期5-7,共3页Surface Technology

摘　　要：研制了新型Mg-Hg-X合金阳极材料,用扫描电镜(SEM)、能谱、X-射线衍射(XRD)和电化学测试等方法分析了镁合金阳极材料在海水介质中腐蚀前后的微观结构、表面形貌及表面元素的组成,研究了Mg-Hg-X合金阳极的溶解过程及活化机理。结果表明:在放电初期,Mg-Hg-X合金阳极材料中的第2相粒子随点腐蚀的发生直接脱落,形成腐蚀坑,随后Mg-Hg-X合金阳极溶解在介质中的合金元素离子与基体镁发生反应,再沉积于镁阳极材料表面的点蚀孔中,形成Hg、X的沉积层,破坏钝化膜的结构,降低了Mg-Hg-X合金阳极极化,使电极电位负移,同时沉积的具有高析氢过电位的Hg、X抑制了析氢腐蚀。A novel Mg-Hg-X alloy anode was made. The microscopic structure, surface appearance, the composition of surface element of Mg-Hg-X alloy anodes have been studied by SEM, XRD and electrochemical techniques. Anodic dissolution and mechanism of activation of Mg alloy anode have been researched. The results show that ： at the initial-stages, the Mg-Hg-X alloy anode appears dot corrosion by doping Hg, X which formed micro-battery with Mg, because of the second phase particles shedded with the dissolve of Mg and forming the corrosion pits. Then the Hg2＋ , X3＋ was deoxidized by Mg and deposited at the surface of the Mg alloy in form of Hg, X coating. The successive oxide film is destroyed by the sediment of Hg, X. The polarization of Mg-Hg-X alloy anodes is decreased, the electrode potential shifts negative and the self-corrosion rate is reduced because of the high hydrogen evolution over-potential Hg, X coating covering on the surface of the Mg alloy.

关 键 词：海水 电池 镁阳极 点腐蚀 活化机理 

分 类 号：TG174.451[金属学及工艺—金属表面处理]