Water-based treatment agent, galvanized steel or zinc alloy plated steel, and painted galvanized steel or painted zinc alloy plated steel

摘要

Even if it does not contain chromium, it is possible to provide an aqueous treatment agent that imparts corrosion resistance, alkali resistance, acid resistance, and coating film adhesion of a molded portion. (A) a zirconium compound, (B) an epoxy resin, (C) a silanol group-containing compound represented by the following formula [I] and / or a condensate thereof, XY (Z) nSi (OH) 3-n (I), ( D) A phosphoric acid compound, (E) a tetravalent vanadium compound, and the mass ratio [(B) / Zr] of the mass of the zirconium compound (A) in terms of Zr and the mass of the epoxy resin (B) is 0.7-1.5, the mass ratio [SiO2 / Zr] of the silanol group-containing compound and / or its condensate (C) to the SiO2 equivalent is 0.15-1.5, and the phosphate compound (D) The mass ratio [P / Zr] to the P-converted mass is 0.025 to 0.1, and the mass ratio [V / Zr] to the V-converted mass of the tetravalent vanadium compound (E) is 0.02 to 0.05. An aqueous treatment agent.