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The microstructures of MgHg alloys with 1.12.9 mass% Hg were investigated in this paper. Under the non-equilibrium solidification condition, the examined MgHg alloys had a two-phase structure consisting of a solid solution phase and a spheroidal-graphite iron-like divorced eutectic. Eutectic ¡-Mg and eutectic Mg 3 Hg formed separately, so the proportion of eutectic Mg 3 Hg could be accurately measured. A method was proposed to estimate the maximum solid solubility of Hg in Mg under the non-equilibrium solidification condition by measuring the area fraction of Mg 3 Hg in metallographes. The maximum solid solubility of Mg2.4 mass% Hg was 0.81 and 0.69 mass%, with cooling rates of 0.67 and 2.0 K/s, respectively. The maximum solid solubility decreased as the cooling rate increased and increased as the Hg content increased.

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Abstract. This study investigated the impacts of Mg-Hg-Ga alloys of various Ga/Hg ratios on phase constituents and electrochemical performance. The relationship between composition and phase constituents of the casting alloys were investigated by SEM and XRD Potentiodynamic polarization curves and the galvanostatic curves of the alloys in 3.5wt% NaCl solution were obtained. With a Ga/Hg ratio greater than 0.97, the second phase changes from Mg 3 Hg to Mg 5 Ga 2 , and the normal eutectic becomes a divorced eutectic. Additionally, corrosion is inhibited and passivation appears with an increase in the Ga/Hg ratio increase. With a starting Ga/Hg ratio of less than 0.68, the discharge process becomes steadier and discharge time simultaneiously increases with the Ga/Hg ratio. Mg-Hg-Ga alloys with a 0.68 Ga/Hg ratio are suitable as the anode material for seawater batteries.