| abstract |
(57) [Summary] [Purpose] To provide a titanium-containing coating having excellent corrosion resistance and coating adhesion on the surface of an Al-containing metallic material. [Structure] Phosphate ion 0.01 to 5 g / liter, titanium compound (Ti equivalent) 0.01 to 2 g / liter, fluoride (F equivalent) 0.01 to 12 g / liter, and accelerator 0.01 to 2 g / Liter, pH 1.0 ~ The surface treatment liquid of 4.5 is applied to the surface of the Al-containing metal material at room temperature to 8 Contact is performed at a temperature of 0 ° C., and the treated surface is washed with water and dried to form a chemical conversion coating film of preferably 3 to 50 mg / m 2 (as Ti). |