Which is a continuation-in-part application of U.S. Application No. 09 / 968,023, filed Oct. 2, 2001, anodized present application of light metal, the United States Application No. 10 / 033,554, filed October 19, 2001 which is a continuation-in-part application of the issue, which is a continuation-in-part application of U.S. Application No. 10 / 162,965, filed June 5, 2002.

摘要

Fluorozirconate or complex fluoride, fluoro titanate, and using an aqueous electrolyte solution containing the oxyfluoride of fluorosilicate salts, article comprising a light metal such as aluminum and magnesium, forming a surface protective coating can be anodized promptly for. White coating can be formed on an aluminum article with an alternating current or pulsed direct current. When the article to be anodized magnesium-containing, the use of pulsed direct current having a relatively low average voltage.