| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrosion-resistant film structure excellent in adhesion to galvanization, including a barrier coating for blocking a corrosive factor to galvanization, and capable of thinning film thickness of the whole coating, while maintaining corrosion resistance.SOLUTION: A mixed film of zinc, aluminum and a silica compound is formed by baking finish on a substrate material surface to which electroplating of zinc or a zinc alloy is applied, and, as a top coat thereon, polyorganosiloxane thin film obtained by a sol-gel method containing an organic material is hardened and then fired, to thereby form a porous silica coating.SELECTED DRAWING: Figure 1 |
