| 摘要 |
PURPOSE:To manufacture a one-side plated steel sheet with high work efficiency by passing a both-side plated steel sheet through an acid soln. while magnetically sticking an endless magnetic belt having a layer preventing the penetration of the plated metal etching soln. to one side of the both-side plated steel sheet. CONSTITUTION:A both-side galvanized and chromate-treated steel sheet S is passed through a vessel 4 holding a soln. dissolving a galvanized layer such as hydrochloric acid or sulfuric acid with support rolls 5, 6. At this time, a flexible magnetic endless belt 7 having a thin filmlike layer of urethane resin or the like preventing the penetration of the galvanized metal etching soln. is magnetically stuck to one side of the sheet S. The other side to which the preventing layer is not stuck is freed of Zn as the galvanized metal by dissolution in the acid soln., and the sheet S is continuously taken out as a one-side galvanized steel sheet S1 from the vessel 4. |
