COATING FILM FORMING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a coating film forming method improving both corrosion resistance and adhesiveness of the coating edge part of a powder coating film in the reverse coating for forming an electrodeposition coating film after the powder coating film is formed. SOLUTION: This method for forming a coating film on the surface of a conductive object to be coated includes a process (1) for coating the surface of the conductive object with the thermosetting powder paint containing a first block polyisocyanate compound and a thermosetting resin to form the powder coating film, a process (2) for heating the powder coating film under a condition thermally melting the powder paint but generating no thermal crosslinking reaction, a process (3) for performing electrodeposition coating using a cation electrodeposition paint containing a second block polyisocyanate compound, a cationic substrate resin and a catalyst for accelerating the curing of the thermosetting powder paint to form the electrodeposition coating film on the uncoated part of the surface of the conductive object, a process (4) for washing the formed coating film with water and a process (5) for heating the coating film to cure the same.