| 摘要 |
PURPOSE:To form a metallic layer having superior adhesion on the cleaned surface of Al by plating by subjecting the Al to zinc substitution plating, ununiform surface roughening with an alkaline soln., treatment with an acidic soln., zinc substitution plating, treatment with an acidic soln. and electroplating. CONSTITUTION:The surface of an Al member is cleaned by degreasing and pickling. The member is subjected to zinc substitution plating with a plating soln. contg. NaoH, Rochelle salt and ZnO. The member is then immersed in the alkaline plating soln. or aqueous alkali soln. contg. 10-550g/l NaOH to finely roughen the surface by ununiform etching. The deposited surface zinc layer is further treated with a strong acid or ammonium persulfate and the member is subjected again to zinc substitution plating. The deposited zinc layer is treated with an acid and finally electroplating is carried out to form a Cu layer having high adhesion on the surface of the Al member. |
