| 摘要 |
PROBLEM TO BE SOLVED: To provide a rust preventive coating method capable of forming a coating film excellent in a rust prevention effect and even more excellent in durability, on a metal surface using lead-free and chromium-free paint. SOLUTION: The rust preventive coating method includes coating a metal surface 3 with paint composed of an epoxy resin containing a rust preventive agent free of lead and chromium to form an undercoat layer 1, and subsequently coating the surface of the undercoat layer 1 with rubber-based paint that yields a coating film exhibiting an elongation of at least 20% and water-vapor permeability of not higher than 400 g/m<SP>2</SP>×24 hr after drying, to form an undercoat protective layer 2. An undercoat protective layer 3 formed of highly elastic rubber-based paint exhibits capability of following the behavior of the metal surface part and prevents the exposure of cracks and scars appearing on the undercoat layer 1. COPYRIGHT: (C)2011,JPO&INPIT |
