In order to improve the corrosion resistance of magnesium lithium alloy, Mg-14 Li alloy with different content of Ca(0, 3, 5, 10 wt.%) was prepared with a induction melting furnace. Electrochemical test and corrosion test were carried out in NaCl solution with different Cl^-concentrations. The results indicate that the microstructure of the Mg-14 Li alloy with Ca consists of dendritic β phase and eutectic structure(β+CaMg_2). With the increase of Ca addition from 0, to 3, 5, 10 wt.%, the corrosion resistance of the Mg-14 Li alloy initially increases first and then decreases, and that of alloy with 3% Ca is the best. Therefore, the corrosion resistance of Mg-14 Li alloy in NaCl solution can be effectively improved by adding proper amount of Ca. In addition, the concentration of Cl^-was one of important factors affecting the corrosion resistance of the Mg-14 Li alloy, and the influence of Ca was slighter than that of Cl^-.
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