Mg-Al-Pb-Ga-Y海水电池用镁阳极的成分优化和电化学性能

Composition optimization and electrochemical properties of Mg-Al-Pb-Ga-Y alloys as anodes for seawater activated battery

采用熔炼法制备了一系列Mg-Al-Pb-Ga-0.9Y海水电池用镁合金阳极材料.利用金相显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)和电化学测试等方法研究了Pb、Ga元素对合金组织和电化学性能的影响.结果表明,合金的放电电压随Pb含量增加而提高.Pb含量(指质量分数,下同)为5%且Ga的添加量为1%时,对放电电压的提升效果达到最优,合金在20mA/cm2和100mA/cm2电流密度下放电均有较大的放电电压.成分为Mg-3Al-5Pb-1Ga-0.9Y的镁阳极具有更优异的综合性能,其放电电位最负,在电流密度为20mA/cm2和100mA/cm2下的工作电位分别为-1.723V和-1.680V;合金的自腐蚀速率较低,腐蚀电流密度为5.1164×10-5A/cm2.

Magnesium alloy anode materials for Mg-Al-Pb-Ga-0.9Y seawater battery were prepared by metallurgy method.The effects of Pb、Ga additions on the microstructures and electrochemical properties of this alloy were investigated by optical microscopy(OM),scanning electronic microscopy(SEM),X-ray diffraction(XRD)and Electrochemical test.The results show that the discharge voltage and corrosion resistance of the alloy increase with the growth of Pb content.Moreover,the optimum effect of discharge voltage is achieved with 5 wt%Pb and 1 wt%Ga additions.The alloy has a high discharge voltage at 20 mA/cm2 and 100 mA/cm2 current densities.The Mg-3Al-5Pb-1Ga-0.9Y alloy has more excellent comprehensive performance than the other alloys,which also has the most negative discharge potential.The working potentials at current densities of 20 mA/cm2 and 100 mA/cm2 are-1.723 V and-1.680 V respectively.In addition,the Mg-3Al-5Pb-1Ga-0.9Y alloy has a low self-corrosion rate,and its corrosion current density is 5.1164×10-5 A/cm2.