| 摘要 |
A water-based treating agent for metal surfaces which comprises a film-forming ingredient (c) comprising, in a specific ratio, an organosilicon compound (C) that has two or more specific functional groups and one or more specific hydrophilic functional groups in the molecule, has a specific molecular weight, and has a cyclic siloxane bond in the skeleton and a polyurethane resin (E) having a specific structural unit, an inhibitor ingredient (d) comprising, as an essential component, a fluorometal complex compound (H) having at least one element selected from titanium and zirconium, and an aqueous medium is applied and dried to thereby form a composite coating film comprising the ingredients. Thus, a galvanized steel sheet which underwent the chromium-free surface treatment is provided. The galvanized steel sheet has excellent properties concerning detergent resistance, sweat resistance, coating film adhesion, bondability, and water resistance and further has excellent processability and sliding properties. |
