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

In this paper, single α-phase alloys (Mg-4Li, Mg-4Li-3AlSi) and single β-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 α-phase alloy Mg-4Li and Mg-4Li-3AlSi are obviously better than that of β-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 α-Mg, β-Li, Mg(OH) 2 , Al 2 O 3 and Mg 2 Si.