| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonchromic zinc phosphate-treated steel sheet which has excellent corrosion resistance and adhesion of a coating material equal to those of the conventional chromate sealing treated material without incorporating hexagonal chromium into a sealing treatment film and, more preferably, has excellent workability. SOLUTION: The surface of a zinc-containing plated steel sheet is provided with a zinc phosphate treatment film of a coating weight of 0.1 to 5 g/m<SP>2</SP>. The upper layer thereof consists of a sealing treatment film obtained by: applying a liquid composition comprising (A) a copper compound, and (B) at least one kind of metallic compound selected from titanium compounds and zirconium compounds, and water, and more preferably comprising (C) a polycondensed resin compound which consists of bisphenol A having a specified chemical structure, amines and formaldehyde having a specified chemical structure, and has a specified number average molecular weight and the mean value of replaced number of amino groups per one benzene ring; and performing drying. COPYRIGHT: (C)2004,JPO
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