采用熔炼铸造方法制备出Mg-5%Hg-1%Ga合金,在573～773 K时效不同时间,利用X射线物相检测、扫描电镜结合能谱分析第二相Mg<,3>Hg的形貌和分布,用交流阻抗法等电化学方法研究Mg<,3>Hg对Mg-5%Hg-1%Ga阳极在3.5%NaCl(质量分数)溶液中电化学性能的影响.结果表明:时效时间从15 min延长至200 h时,Mg-5%Hg-1%Ga合金中α-Mg和Mg<,3>Hg的共晶组织转变为α-Mg基体中弥散分布Mg<,3>Hg颗粒,这种转变降低了浓差极化和法拉第反应中电荷传递电阻,提高电化学活性.弥散分布的Mg<,3>Hg颗粒使Mg-5%Hg-1%Ga合金组织均匀,提高了耐腐蚀性能.
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