| 摘要 |
PURPOSE:To improve the adhesion of a plated film by determining the electrolytic condition in a subsequent activation stage by anodic electrolysis in accordance with the detection values of the oxidation degree on the steel surface in the drying and preheating stages. CONSTITUTION:A band steel 2 from a recoiler 1 is continuously sent to a drying chamber 7 through a degreasing vessel 3, a water washing vessel 4, a pickling vessel 5, and a water washing vessel 6, heated, and dried. The band steel 2 is introduced into a preheating stage, and dried in the inert gas atmosphere 9 isolated from the outside by a seal roll 8. The steel is then sent into an anodic electrolysis cell 10 in the same atmosphere, subjected to the anodic electrolysis in the fused-salt electrolytic bath of AlCl3, etc., and activated. The pretreated band steel 2 is sent into a fused-salt electrolysis plating bath 14 preferably kept in an inert gas atmosphere through a roll 13 isolated from air, and specified electrolysis is carried out. The electrolytic voltage and current in the electrolytic cell 10 are determined in accordance with the amt. and property of the formed oxide film on the steel band surface in heating and drying.
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