| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemically-converted Al-based metal plated steel sheet having a chemical conversion coating film containing an organic resin, which is excellent in weatherability, water resistance, and coating film adhesiveness. SOLUTION: Solution of chemical conversion treatment is applied onto a surface of an Al-based alloy plated steel sheet, and dried to form a chemical conversion coating film having a film thickness of 0.5-10μm. The solution of chemical conversion treatment contains: fluorine-containing resin containing, by mass, 0.05-5% reactive functional group and 7-20% F atoms while the number-average molecular weight is within the range of 1,000 to 80,000; an organic crosslinking agent having a functional group to be reactive with the reactive functional group; and group 4A metal compounds. The amount of the organic crosslinking agent to the amount of fluorine-containing resin in the solution for chemical conversion treatment is within the range of 0.8-9.6%. The amount of the group 4A metal compounds to the amount of fluorine-containing resin in the solution for chemical conversion treatment is within the range of 0.1-5% in terms of metal. COPYRIGHT: (C)2012,JPO&INPIT |
