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Mg-Al-Pb合金是一种新开发的海水激活电池材料。采用熔炼浇注法制备Mg-6Al-5Pb-0.5Mn系列合金和Mg-6Al-5Pb合金。其中,Mg-6Al-5Pb-0.5Mn系列合金是以Al-15%Mn、Al-30%Mn和Al-50%Mn中间合金为添加剂制备的。采用金相显微镜和扫描电子显微镜表征其组织,采用电化学方法、析氢法和失重法研究其性能。结果表明:以Al-50%Mn中间合金为添加剂制备的Mg-6Al-5Pb-0.5Mn合金具有最负的放电电位(-1.66 V),最小的腐蚀电流密度(7μm/cm2)和自腐蚀速率(0.51 mg·h-1·cm-2)。这可能是因为Al11Mn4相的存在,不仅有利于腐蚀产物的脱落和增大电化学反应面积,而且也提高电化学活性。
Mg-Al-Pb alloy is a newly developed seawater activated cell material. Mg-6Al-5Pb-0.5Mn series alloy and Mg-6Al-5Pb alloy were prepared by melting and pouring method. Among them, the Mg-6Al-5Pb-0.5Mn series alloy is prepared with Al-15% Mn, Al-30% Mn and Al-50% Mn master alloys as additives. The microstructure was characterized by optical microscopy and scanning electron microscopy. The electrochemical properties, hydrogen evolution and weight loss were investigated. The results show that the Mg-6Al-5Pb-0.5Mn alloy prepared with Al-50% Mn master alloy has the most negative discharge potential (-1.66 V), the minimum corrosion current density (7μm / cm2) and the self-corrosion rate (0.51 mg · h-1 · cm-2). This may be because of Al11Mn4 phase, not only conducive to the corrosion products off and increase the electrochemical reaction area, but also improve the electrochemical activity.