MAGNESIUM-LITHIUM ALLOY AND SURFACE TREATMENT METHOD THEREFOR

摘要

Disclosed are a method for forming a coating film having low surface electrical resistance and moreover having excellent bare corrosion resistance and performance as surface for painting, and a magnesium-lithium alloy obtained thereby. The surface treatment method for the magnesium-lithium alloy has a step for treating the surface of a magnesium-lithium alloy material with a low-electrical-resistance treatment fluid that is an inorganic acid containing metal ions at 0.021-0.47 g/L in terms of aluminum, and 0.0004-0.029 g/L in terms of zinc. The surface treatment method for the magnesium-lithium alloy further has a coating-film-formation treatment step for immersing in a 3.33-40 g/L aqueous solution of acidic ammonium fluoride after performing surface adjustment.