| 摘要 |
PURPOSE:To markedly enhance the corrosion-proofness and pitching resistance of a paint film, by applying a barrier coat containing corrosion-proof pigment having a specific composition and properties to a cationic electrodeposition paint film surface containing pigment at high concn. CONSTITUTION:In the formation of a paint film to the steel plate part of a car body, a cationic electrodeposition paint, an intermediate coat and a top coat are successively applied to a steel plate. In this process, as the cationic electrodeposition paint, a paint, wherein 40-150pts.wt. of color pigment such as zinc oxide, antimony white or graphite, an extender and rust inhibiting pigment are compounded with 100pts.wt. of a resin solid, is used. After the painting of the electrodeposition paint, a corrosion-proof pigment-containing barrier coat based on a modified polyolefin resin, wherein the static glass transition temp. of a formed paint film is -30--60 deg.C, is applied prior to applying the intermediate paint to impart buffering action against impact from the outside to the paint film.
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