目的 研究合金化及后续热处理下的镁阳极电化学性能，开发出一种新型镁合金阳极材料。方法 利用熔炼法制备Mg-6%Al-1%Zn-0.5%In(质量分数)并做海水激活电池阳极材料，采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)和一系列电化学测试方法研究在3.5%NaCl溶液中In元素的添加和后续固溶处理对Mg-6%Al-1%Zn(AZ61)合金显微组织及其电化学性能的影响。结果 合金元素In的添加及后续热处理可提升镁阳极的放电活性和利用效率。AZ61+0.5%In合金经420 ℃固溶16 h后，在10 mA/cm²和50 mA/cm²下有更负的平均放电电位，分别为?1.545 V(vs. SHE)和?1.229 V(vs. SHE)，利用效率在2种电流密度下分别达56.2%与59.3%。结论 向AZ61合金中加入0.5%In，其会与Al存在竞争溶解机制，促进第二相Mg17Al12的生成。不连续分布的第二相和In自身的溶解-再沉积作用破坏了腐蚀产物膜的连续性，大幅提升了AZ61的放电活性。经420 ℃固溶处理16 h后，可在不增大晶粒尺寸的前提下使得第二相Mg17Al12基本溶入基体。此时腐蚀产物膜的稳定性进一步降低，合金成分更均匀，镁阳极的放电活性也得以提升。

Seawater-activated battery has received tremendous attention due to the increasing demand for underwater devices. Mg alloy is one of the promising candidates for seawater-activated battery anodes due to the favorable electrochemical characteristics, such as a relatively negative electrode potential (?2.37 V vs. standard hydrogen electrode (SHE)), high theoretical specific capacity (2 189 mAh/g), and low density (1.74 g/cm3). However, the Mg-based anodes always exhibit severe self-discharge in the aqueous electrolyte and the generated products adhered to the anode strongly impede the active dissolution of anode materials. The intent of this work is to study the effect of indium addition and subsequent heat treatment on the electrochemical properties of magnesium anode, thus develop a novel magnesium anode material.