METHOD FOR FORMING MULTILAYER COATING FILM

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PROBLEM TO BE SOLVED : To provide a method for forming a multilayer coating film as an alternative of a conventional method, which can eliminate a conventional complicated and expensive rust-preventing chemical conversion treatment process, for instance, a zinc phosphate treatment process and the like, further can impart rust-preventing properties equal to or more excellent than those by a conventional rust-preventing chemical conversion treatment process to the coating film, furthermore which are suitable for a real corrosive environment, and is superior in economical efficiency. SOLUTION : The method for forming the multilayer coating film includes the steps of : (a) immersing an untreated metallic substrate into an aqueous solution containing a nitrate of a rare earth metal, a zinc salt and a nickel salt, and cathodically electrolyzing the substrate to form an electrolysis film containing a rare earth metal, zinc and nickel on the metallic substrate; and (b) immersing the metallic substrate on which the electrolysis film is formed in the step (a) into an electrodeposition paint, and forming an electrodeposition paint film by electrodeposition coating. COPYRIGHT : (C)2010, JPO&INPIT