Effect of rolling-induced microstructure on corrosion behaviour of an as-extruded Mg-5Li-1Al alloy sheet

The effect of rolling-induced microstructural changes of Mg-5Li-1Al (LA51) alloy sheet on its corrosion behaviour was systematically investigated. Microstructure was examined by optical microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Corrosion performance was evaluated by electrochemical measurements, immersion tests, and direct visual observation. The results reveal that the corrosion performance of LA51 alloy sheet improved as a function of rolling reduction. The notable increase in corrosion resistance of the rolled LA51 alloy sheet was attributed to its characteristic texture, texture-intensity, and the formation of twins and protective oxide surface films.