SURFACE TREATMENT METHOD FOR ALUMINUM ALLOY AND SURFACE TREATMENT METHOD FOR MAGNESIUM ALLOY

摘要

Disclosed are a surface treatment method for an aluminum alloy and a surface treatment method for a magnesium alloy, which enable to provide the surface of an aluminum alloy containing magnesium or the surface of a magnesium alloy with sufficient corrosion resistance to corrosive gases, while preventing the surface of the aluminum alloy containing magnesium or the surface of the magnesium alloy from scattering magnesium therefrom even when the aluminum alloy containing magnesium or the magnesium alloy is used in vacuum at a temperature of not less than 300°C. In this method, a carbon fluoride compound is applied over the surface of the aluminum alloy containing magnesium or the surface of the magnesium alloy and then the aluminum alloy or the magnesium alloy containing magnesium is heated in an oxygen atmosphere, thereby forming a fluoride passivation film.