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采用熔炼铸造方法制备出Mg-5%Hg-1%Ga合金,在573～773K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Mg3Hg的形貌和分布,用交流阻抗法等电化学方法研究Mg3Hg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15min延长至200h时,Mg-5%Hg-1%Ga合金中α-Mg和Mg3Hg的共晶组织转变为α-Mg基体中弥散分布Mg3Hg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Mg3Hg颗粒使Mg-5%Hg-1%Ga合金组织均匀,提高了耐腐蚀性能。
Mg-5% Hg-1% Ga alloy was prepared by the smelting casting method. The morphology and distribution of the second phase Mg3Hg were analyzed by X-ray phase detection, scanning electron microscopy and energy dispersive spectroscopy at different aging time of 573-773K, Impedance method and other electrochemical methods Mg3Hg Mg-5% Hg-1% Ga anodes in 3.5% NaCl (mass fraction) solution electrochemical performance. The results show that when the aging time is increased from 15min to 200h, the eutectic microstructure of α-Mg and Mg3Hg in Mg-5% Hg-1% Ga alloy is transformed into Mg3Hg particles dispersed in α-Mg matrix, Poor polarization and Faraday reaction charge transfer resistance, improve the electrochemical activity. The dispersed Mg3Hg particles make the microstructure of Mg-5% Hg-1% Ga alloy uniform and improve the corrosion resistance.