| 摘要 |
An improved method of providing a protective coating on the surface of aluminum or aluminum alloys, comprising: removing contaminants from the surface; exposing the surface to water at 50 to 100.degree.C to form a porous coating on the surface; and exposing the boehmite -coated surface to an aqueous solution comprising a cerium salt and a metal nitrate at a temperature of 70 to 100.degree.C. Oxides and hydroxides of cerium are formed within the pores of the boehmite to provide the protective coating, which provides corrosion resistance and improved paint adhesion.
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