| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pollution-free surface treating composition which can give a galvanized steel stock excellent in corrosion resistance and does not contain a harmful heavy metal such as lead, chromium or cadmium. SOLUTION: The water-base surface treating composition contains 100 pts.wt., in terms of solid content, of a dispersion of anα-olefin/α,β-ethylenically unsaturated carboxylic acid copolymer resin, and 5-60 pts.wt. of a silica-modified magnesium phosphate. A method for surface treatment of a galvanized steel stock is characterized in that the water-base surface treating composition is applied to the surface of a galvanized steel stock.
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