| 摘要 |
PURPOSE:To obtain a steel sheet having excellent solderability, corrosion resistance, workability, and ageing property, by coating a processing soln. consisting essentially of a phosphoric ester or further added with a Cr<6+> ion and org. amine soap on the plated steel sheet to be soldered. CONSTITUTION:The processing soln. is composed of 5-200g/l water-soluble or water-dispersible phosphoric ester, or further added with 0.01-3g/l Cr<6+> ion or 10-100g/l org. amine soap or their mixture. A plated steel sheet is treated with the processing soln. kept at 3-10pH to obtain a coat having 0.01-2mu thickness on dry basis. As a result, a plated steel shaving excellent corrosion resistance, solderability, workability, and ageing property can be formed.
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