| 摘要 |
PURPOSE:To enable the electroplating of an Al material even in case where the Al material is Al foil which is hardly electroplated by a conventional method, by pretreating the Al material by AC electrolysis in an acidic nickel salt bath of a specified pH. CONSTITUTION:An Al material is pretreated by AC electrolysis in an aqueous soln. of 2-3.5pH contg. a water soluble nickel salt and an inorg. acid and/or an org. acid forming a porous oxide film together with the nickel salt to form an underlayer. Cathodic electrolysis is then carried out in a conventional electrolytic bath in a single stage or plural stages.
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