Influence of cerium on microstructures and electrochemical properties of Al-Mg-Sn-Hg anode materials for seawater battery
来源期刊：Journal of Rare Earths2015年第9期
论文作者：冯艳 李晓庚 王日初 彭超群 刘莉
文章页码：1010 - 1016
摘 要：Aluminum is an innovative anode material for seawater battery. But large polarization and low electrochemical activity restrict its application. In this research, Al-Mg-Sn-Hg-Ce anode materials were prepared and the microstructures were investigated by scanning electron microscopy（SEM）. The electrochemical properties of Al-Mg-Sn-Hg-Ce anode materials were measured by potentiodynamic polarization and potential-time discharge in a 4.5 wt.%Na OH solution at 353 K. The results indicated that the increasing content of cerium addition refined the grain structure of Al-Mg-Sn-Hg alloy and promoted the uniform distribution of Sn and Hg elements in Al matrix. The morphology of second phases changed from disperse granular to intergranulate strip with the increasing content of cerium addition in Al-Mg-Sn-Hg alloy. During the half-cell tests at a 650 m A/cm3 current density, the discharge activity of Al-Mg-Sn-Hg-Ce alloy was improved with the increasing content of cerium addition. The average discharge potential of Al-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 AZ91 D. The best corrosion resistance occurred in Al-Mg-Sn-Hg-0.05 wt.%Ce alloy with the corrosion current density, 18.84± 2.21 m A/cm2. The corrosion behaviours of Al-Mg-Sn-Hg-Ce alloys were also analyzed.
冯艳1,2，李晓庚1,2，王日初1,2，彭超群1，刘莉1,2
1. School of Materials Science and Engineering, Central South University2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education
摘 要：Aluminum is an innovative anode material for seawater battery. But large polarization and low electrochemical activity restrict its application. In this research, Al-Mg-Sn-Hg-Ce anode materials were prepared and the microstructures were investigated by scanning electron microscopy（SEM）. The electrochemical properties of Al-Mg-Sn-Hg-Ce anode materials were measured by potentiodynamic polarization and potential-time discharge in a 4.5 wt.%Na OH solution at 353 K. The results indicated that the increasing content of cerium addition refined the grain structure of Al-Mg-Sn-Hg alloy and promoted the uniform distribution of Sn and Hg elements in Al matrix. The morphology of second phases changed from disperse granular to intergranulate strip with the increasing content of cerium addition in Al-Mg-Sn-Hg alloy. During the half-cell tests at a 650 m A/cm3 current density, the discharge activity of Al-Mg-Sn-Hg-Ce alloy was improved with the increasing content of cerium addition. The average discharge potential of Al-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 AZ91 D. The best corrosion resistance occurred in Al-Mg-Sn-Hg-0.05 wt.%Ce alloy with the corrosion current density, 18.84± 2.21 m A/cm2. The corrosion behaviours of Al-Mg-Sn-Hg-Ce alloys were also analyzed.
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