PROCESS FOR PRODUCING METAL SUBSTRATE WITH MULTILAYER FILM, METAL SUBSTRATE WITH MULTILAYER FILM OBTAINED BY THE PROCESS, AND COATED ARTICLE

摘要

PROBLEM TO BE SOLVED: To find a process for forming a multilayer film that has excellent corrosion resistance, in particular, weathering corrosion resistance, and to provide a coated article having a film with such excellent properties.;SOLUTION: Specifically, the process for producing a metal substrate with a multilayer film comprises immersing the metal substrate in an aqueous bismuth compound solution (A) and applying an electric current between the metal substrate and an electrode to thereby form a coating film (F1) on the metal substrate; and then applying a coating composition (B) on the coating film (F1) to form a coating film (F2).;COPYRIGHT: (C)2009,JPO&INPIT