| 摘要 |
PURPOSE:To produce the surface treated steel sheet having the excellent secondary adhesive property of a coated film by forming a galvanized layer on the surface of the steel sheet and successively forming a ferrous plating layer and molybdenum oxide layer of specific thicknesses further thereon. CONSTITUTION:The galvanizing layer or zinc alloy plating layer or composite zinc alloy plating layer is formed as a 1st layer on the surface of the steel sheet and the ferrous plating layer is formed as the 2nd layer on the 1st layer to 0.01-5.0mu, more preferably 0.1-1.0mu. This steel sheet is treated with a soln. contg. >=1 kinds among molybdenic acid ions, tungstenic acid ions and vanadic acid ions to stick >=1 kinds of molybdenium oxide or hydroxide, tungsten oxide or hydroxide and vanadium oxide or hydroxide thereto at 0.1-20mg/m<2>, more preferably 0.5-10mg/m<2> in total in terms of Mo, W, and V. The surface treated steel sheet having the excellent secondary adhesive property of the coated film is obtd. in this way without impairing the chemical conversion treatability of the steel sheet. |
