摘要 |
The present invention provides a process for producing a metal substrate with a multilayer film that has excellent corrosion resistance. Specifically, the process comprising immersing a 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).
|