| 摘要 |
PURPOSE:To eliminate the unnecessary excess pre-after-treatment and to manufacture one side plating sheet at a low price, by applying lipophilic flux solution on one side face of the steel sheet omitted pre-treatment and drying the then dipping the above sheet in molten metal bath. CONSTITUTION:Lipophilic flux solution, for example, 15-20% NH4Cl water solution added general-purpose surface active agent, on one hand face of the sheet 1 without carrying out pre-treatment, such as fat removing, pickling etc. and the sheet 1 is dried at about 100 deg.C. Next, the above sheet carried out drying treatment, is dipped in the molten metal bath 2 and hot dipping is carried out on the surface of the above face applied flux. Then, plating thickness of the sheet 1 carried out plating treatment by the wiping nozzle 3, is regulated. On the other hand, thin dense oxidation film is formed on the other surface of the sheet 1 only applied rust preventing agent as it is at the time of decomposing oil component and sticking of hot dipping metal is prevented. The above oxidation film is easily remobed by the next mechanical or chemical process and one side hot dipping sheet 4 is manufactured. |
