| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment liquid and a treating method, by which a phosphate film excellent in corrosion resistance, fingerprint resistance, and film adhesion can be formed. SOLUTION: A first surface treatment liquid is prepared by adding an hydroxy carboxylic acid compound to a treating liquid containing a phosphate of one or more kinds of metals selected from manganese, magnesium, molybdenum, zinc, calcium, and zirconium, thereby improving its corrosion resistance and film adhesion. A second surface treatment liquid is prepared by mixing a silane coupling agent and silica sol with the first surface treatment liquid, thereby improving the fingerprint resistance. In this treating method, the first and second treatment liquids are applied to the surface of a plated steel plate is coated with so that the amount of P in the phosphate is 5-200 mg/m2, and then it is dried at a plate temperature of 80-250 deg.C without washing it with water.
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