METHOD FOR COATING CERAMIC FILM ON METAL, ELECTROLYSIS SOLUTION FOR USE IN THE METHOD, AND CERAMIC FILM AND METAL MATERIAL

摘要

This invention provides a method for coating a ceramic film on a metal, which can form dense films on varisou bases of metals such as magnesium alloys. The formed ceramic film has excellent abrasion resistance, causes no significant attack against a counter material, and has excellent corrosion resistance. The method comprises electrolyzing a metallic base in an electrolysis solution using the metallic base as a working electrode while causing glow discharge and/or arc discharge on the surface of the metallic base to form a ceramic film on the surface of the metallic base. The electrolysis solution contains zirconium oxide particles having an average diameter of not more than 1 µm, satisfies the following formulae (1) to (3): 0.05 g/L ‰¤ X ‰¤ 500 g/L (1), 0 g/L ‰¤ Y ‰¤ 500 g/L (2), and 0 ‰¤ Y/X ‰¤ 10 (3); and has a pH value of not less than pH 7.0. In the formulae (1) to (3), X represents the content of zirconium oxide particles in the electrolysis solution; and Y represents the content of a compound of at least one element selected from the group consisting of Mg and the like, other than zirconium oxide.