Discharge behavior of Mg–4 wt%Ga–2 wt%Hg alloy as anode for seawater activated battery
Discharge behavior of Mg–4 wt%Ga–2 wt%Hg alloy as anode for seawater activated battery
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DOI：
10.1016/j.electacta.2011.06.065
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发表时间：
2011-10
影响因子：
6.6
通讯作者：
Jun Zhao;Kun Yu;Yanan Hu;Shaojun Li;X. Tan;Fuwen Chen;Zhiming Yu
中科院分区：
文献类型：
--
作者：
Jun Zhao;Kun Yu;Yanan Hu;Shaojun Li;X. Tan;Fuwen Chen;Zhiming Yu
镁镓汞合金是一种新型的海水电池负极材料。研究了Mg-4%Ga-2%Hg合金在海水中的动电位极化、恒电流放电和电化学阻抗谱，并与工业AZ 31和AP 65合金进行了比较。结果表明，Mg-4%Ga-2%Hg合金在铸态、挤压态、轧制态和退火态下表现出不同的放电行为。退火Mg-4%Ga-2%Hg板材在不同电流密度下的腐蚀电位最负。Mg-4%Ga-2%Hg合金的腐蚀电位比AZ 31和AP 65合金负。电化学阻抗谱研究表明，Mg-Ga-Hg合金/海水界面过程是由活化控制反应决定的。Mg3 Hg和Mg 21 Ga 5 Hg 3相的存在改善了Mg-4%Ga-2%Hg合金的电化学性能。由于Mg-4%Ga-2%Hg合金在放电特性和微观结构方面的优势，以Mg-4%Ga-2%Hg合金为阳极、CuCl为阴极的组装原型电池具有令人满意的放电性能。
Magnesium–gallium–mercury alloy is one of the new developed anode materials for seawater activated batteries. The potentiodynamic polarization, galvanostatic discharge and electrochemical impedance spectroscopy of Mg–4%Ga–2%Hg alloy in seawater are studied and compared with commercial AZ31 and AP65 alloys in this study. The results show that Mg–4%Ga–2%Hg alloy exhibits different discharge behaviors in as-cast, homogenizing, rolling and annealing conditions. The annealing Mg–4%Ga–2%Hg sheet obtains the most negative corrosion potentials in different current densities. And the Mg–4%Ga–2%Hg alloy provides more negative corrosion potentials than AZ31 and AP65 alloys. EIS studies reveal that the Mg–Ga–Hg alloy/seawater interfacial process is determined by an activation-controlled reaction. The Mg3Hg and Mg21Ga5Hg3phases improve the electrochemical properties of Mg–4%Ga–2%Hg alloy. The assembled prototype battery with Mg–4%Ga–2%Hg alloy as anode and CuCl as cathodes exhibits a satisfactory discharge performance because of the advantages in discharge characterizations and microstructure of the Mg–4%Ga–2%Hg alloy.