| 摘要 |
PURPOSE:To form the titled firm rust preventive substrate film by pressing a roll made of a metal or its alloy exhibiting a rust preventive effect on steel due to a sacrificial anodic reaction on the clean roughed surface of the steel to be applied with rust preventive treatment while rotating the roll at high speed, and transferring the component of the roll material on the steel surface. CONSTITUTION:The clean roughed surface 2 is formed on the surface of steel 1 by pickling, etc. A hollow body 3 of a metal (Zn, Sn, etc.) or its alloy exhibiting a rust preventive effect on the steel 1 due to a sacrificial anodic reaction is mounted on a core metal 4 which is attachable to and detachable from a rotating shaft 5 to form a high-speed rotating roll R. The roll is pressed on the roughed surface 2 under a specified pressure P. The treatment is carried out at specified pressure, number of passes, number of revolutions, etc., and the component of the roll material is transferred to form a transferred component layer 6 on the roughed surface 2. An undercoat 7 is applied, as required, on the layer 6 by chromate treatment, etc., and a finish coat 8 is applied thereon. This invention method is appropriately used for the surface treatment of a large-sized steel structure such as bridges and towers and the local rust preventive treatment before coating at the time of repairing the sheet metal of an automobile, etc.
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