| 摘要 |
PURPOSE:To improve the adhesive strength of an Al substrate to plating by using a pretreating soln. consisting of acidic sodium fluoride and an aqueous HCl soln. CONSTITUTION:A soln. for pretreating an Al substrate before plating is prepd. by adding acidic sodium fluoride to an aqueous HCl soln. in 0.003-15 concn. ratio of acidic sodium fluoride to HCl and by mixing and stirring them. An Al substrate is immersed in the pretreating soln. kept at 15-30 deg.C until bubbles are generated on the whole surface of the substrate.
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