Corrosion Resistance of as-rolled Mg-Li-AlSi Alloys

In this paper, single a-phase alloys (Mg-4Li, Mg-4Li-3AlSi) and single beta-phase alloys (Mg-12Li, Mg-12Li-3AlSi) were used as the research object. The corrosion behaviors of four alloys in 3.5wt% NaCl solution are investigated. The influence of elemental Al and Si on the corrosion resistance of the alloy is revealed. The corrosion resistances of alpha-phase alloy Mg-4Li and Mg-4Li-3A1Si are obviously better than that of beta-phase alloy Mg-12Li and Mg-12Li-3AlSi. The addition of Al-Si master alloy could increase the rate of hydrogen evolution and decrease the corrosion resistance of the alloy. The surface phase of the Mg-Li-AlSi is mainly consist of alpha-Mg, I3-Li, Mg(OH)(2), Al2O3 and Mg2Si.