Effect of In on structure and electrochemical properties of Al-Mg-Ga-Sn-(In) aluminum alloy anodes

doi:10.13251/j.issn.0254-6051.2020.07.032

Abstract

Abstract: Nine aluminum-air battery anode materials were designed by adding alloy elements Mg, Ga, Sn and In into Al through orthogonal test. The electrochemical properties of aluminum alloy anodes were optimized by means of the potentiodynamic polarization test, hydrogen evolution test and constant current discharge test, the microstructure and components of aluminum alloy anode were observed by SEM and EDS. The results show that the aluminum alloy anodes without In element including No.1 alloy (Al-0.5Mg-0.05Sn-0.05Ga), No.5 alloy (Al-Mg-0.1Sn-0.2Ga) and No.9 alloy (Al-2Mg-0.2Sn-0.1Ga) have poor discharge performance and higher self-corrosion rate, while No.7 anode alloy (Al-2Mg-0.05Sn-0.2Ga-0.05In) has the best discharge voltage (average voltage to -1.968 V) and corrosion resistance (self-corrosion rate to 0.193 mL·cm^-2·min^-1). After removing the corrosion products, it is found that the corrosion surface of No.5 alloy is full of deep corrosion pits which increases the self-corrosion, while the corrosion surface of No.7 alloy has shallow corrosion pits, which slows down the ion transfer in the electrolyte and the self-corrosion rate. Therefore, No.7 aluminum alloy is suitable for the anodic material of aluminum-air battery.

Key words: Al-Mg-Ga-Sn-In aluminum alloy, aluminum-air battery, anode, electrochemical properties, orthogonal experiment

CLC Number:

TG172.5

Zhu Lingli, Li Yun, Liu Hui, Lü Zhengfeng,Yu Kun. Effect of In on structure and electrochemical properties of Al-Mg-Ga-Sn-(In) aluminum alloy anodes[J]. Heat Treatment of Metals, 2020, 45(7): 159-162.

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