| 摘要 |
Provided is a method for obtaining a chemical conversion coating-treated zinc-aluminum-magnesium alloy-plated steel sheet having an excellent corrosion resistance and adhesion performance with respect to a resin coating. A method for treating the surface of a zinc-aluminum-magnesium alloy-plated steel sheet using a metal surface treatment agent, wherein the metal surface treatment agent contains predetermined amounts of a compound (A) having a zirconyl ([Zr=O]2+ ) structure, a vanadium compound (B), a titanium fluoro complex compound (C), an organophosphorus compound (Da) containing a phosphate group and/or a phosphonic acid group, an inorganic phosphorus compound (Db), a specific aqueous acrylic resin (E), and an oxazoline group-containing polymer (F) as a curing agent, and the metal surface treatment agent has a pH of 3-6. |
