Influence of cerium on microstructures and electrochemical properties of Al-Mg-Sn-Hg anode materials for seawater battery

作     者：冯艳 李晓庚 王日初 彭超群 刘莉 FENG Yan;LI Xiaogen;WANG Richu;PENG Chaoqun;LIU Li

作者机构：School of Materials Science and Engineering Central South University Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2015年第33卷第9期

页      面：1010-1016页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0708[理学-地球物理学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by National Natural Science Foundation of China(51101171) the Specialized Research Fund for the Doctor Program of Higher Education(20110162120051) 

主　　题：A1 anode materials rare earths corrosion resistance electrochemical activity scanning electron microscopy 

摘      要：Aluminum is an innovative anode material for seawater battery. But large polarization and low electrochemical activity restrict its application. In this research, A1-Mg-Sn-Hg-Ce anode materials were prepared and the microstructures were investigated by scanning electron microscopy （SEM）. The electrochemical properties of A1-Mg-Sn-Hg-Ce anode materials were measured by potentiodynamic polarization and potential-time discharge in a 4.5 wt.%NaOH solution at 353 K. The results indicated that the increasing content of cerium addition refined the grain structure of A1-Mg-Sn-Hg alloy and promoted the uniform distribution of Sn and Hg elements in A1 matrix. The morphology of second phases changed from disperse granular to intergranulate strip with the increasing content of cerium addition in AI-Mg-Sn-Hg alloy. During the half-cell tests at a 650 mA/cm3 current density, the discharge activity of AI-Mg-Sn-Hg-Ce alloy was improved with the increasing content of cerium addition. The average discharge potential of AI-Mg-Sn-Hg-0.3 wt.%Ce alloy was -1.721 V （vs. SCE）, which was more negative than -1.406 V （vs. SCE） in AZglD. The best corrosion resistance occurred in A1-Mg-Sn-Hg-0.05 wt.%Ce alloy with the corrosion current density, 18.84± 2.21 mA/cm2. The corrosion behaviours of A1-Mg-Sn-Hg-Ce alloys were also analyzed.