AZ镁合金在高氯酸镁溶液中的电化学行为

Electrochemical Behavior of AZ Magnesium Alloys in Magnesium Perchlorate Solution

用失重、线性电位扫描、交流阻抗、恒流放电等多种方法研究了AZ镁合金在1.0mol/LMg(ClO4)2溶液中的电化学行为,考察了它们作为镁电池负极材料的性能。浸泡与伏安实验结果表明,AZ21的自腐蚀比AZ31和AZ61严重;AZ21和AZ31的电化学活性优于AZ61,表现为阳极极化小,开路电位负。交流阻抗结果表明AZ21、AZ31、AZ61的Rct值逐渐增加。恒电流放电发现,AZ31的放电电位负且稳定;电流效率为82%,高于AZ21和AZ61;滞后时间2s,小于AZ21和AZ61。可望用于Mg电池。

The electrochemical behaviors of AZ magnesium alloys in 1.0 mol/L Mg(ClO(4))(2) solution were investigated by mass loss, linear sweep voltammetry (LSV), electrochemical impedance spectroscopy and chronopotentiometry, in order to examine their performances as negative electrode material in magnesium battery. The results of immersion and LSV show that the self-corrosion rate of AZ21 is larger than that of AZ31 and AZ61; AZ21 and AZ31 are more active than AZ61, exhibiting less anode polarization and negative open circuit potential. The EIS show R(ct) of AZ21, AZ31 and AZ61 magnesium alloys gradually increase. In the discharging experiment, the discharge potential of AZ31 is negative and stable. The anodic current efficiency of AZ31 is 82%, higher than that of AZ21 and AZ61 magnesium alloys. The delay time of AZ31 is 2 s, shorter than that of the AZ21 and AZ61. Thus, the AZ31 magnesium alloy is more excellent as anodic material of Mg battery.