中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 31 No. 9 September 2021 |
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Electronic Packaging and Advanced Functional Materials, Central South University, Changsha 410083, China）
Abstract:The effects of 0.01 wt.% Ga on microstructure and electrochemical performance of Al-0.4Mg-0.05Sn- 0.03Hg anodes in NaOH solutions were investigated. Potentiodynamic polarization, electrochemical impedance spectroscopy, and galvanostatic discharge tests were used to assess the electrochemical performance of the Al-Mg-Sn-Hg-Ga anodes. The results show that the addition of 0.01 wt.% Ga in Al-0.4Mg-0.05Sn-0.03Hg anode enhances its corrosion resistance and discharge activity. It is benefited from the refined second phases and homogenous microstructure of Al-Mg-Sn-Hg-Ga anode, which restrains the local crystallographic corrosion and chunk effect. Compared with Al-Mg-Sn-Hg anode, the corrosion current density and the mass loss rate of Al-Mg-Sn-Hg-Ga anode decrease by 57% and 93%, respectively. When discharging at the current density of 20 mA/cm2, the discharge voltage, current efficiency and specific capacity of the single Al-air battery with Al-0.4Mg-0.05Sn-0.03Hg-0.01Ga anode are 1.46 V, 33.1%, and 1019.2 A·h·kg-1, respectively. The activation mechanism of Ga on Al-Mg-Sn-Hg-Ga anode materials was also discussed.
Key words: aluminum alloy; electrochemistry; corrosion; Al-air battery
