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SURFACE-TREATING AGENT FOR ZINC-PLATED STEEL SHEET, AND ZINC-PLATED STEEL SHEET AND PROCESS FOR PRODUCTION THEREOF
SURFACE-TREATING AGENT FOR ZINC-PLATED STEEL SHEET, AND ZINC-PLATED STEEL SHEET AND PROCESS FOR PRODUCTION THEREOF
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机译:镀锌钢板和镀锌钢板的表面处理剂及其生产工艺
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摘要
The present invention provides a chromium-free surface treatment agent, comprising: a resin compound having a specific bisphenol skeleton; cationic urethane resin emulsion; silane coupling agent; an organic titanium chelate compound; a quadrivalent vanadyl compound; a molybdic acid compound; and water, wherein these components are blended at predetermined ratios such that pH value of the surface treatment agent is in the range of 4 to 5. The one-pack type chromium-free surface treatment agent of the present invention exhibits good stability during storage and is capable of forming on a metal material surface a coating film excellent in corrosion resistance at a bending-processed portion of a steel sheet, solvent resistance and paintability after alkali degreasing.
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