COMPOSITION AND PROCESS FOR THE ELECTRO-DEPOSITION OF ZINC-NICKEL ALLOY DEPOSITS

摘要

PURPOSE: To provide a Zn-Ni alloy plating soln. having improved gloss and throwing power by contg. zinc chloride, nickel chloride and ammonium chloride in such a way as to contain Zn2+, Ni2+, NH4+ at specific concns. and contg. specific surfactants. CONSTITUTION: A Zn-Ni alloy electroplating soln. contg. zinc chloride, nickel chloride and ammonium chloride so as to contain 10W90g/l Zn2+, 5W60g/l Ni2+ and 5W120g/l NH4+ and contg. ?2.5 Zn2+/Ni2+ (by weight) and further contg. a surfactant having polyoxyalkylene chains is prepd. There are polyoxyethylene alkyl ether, etc. for the surfactant having polyoxyalkylene chains, and usually the surfactant is added at about 0.1W200g/l. The pH of the plating soln. is controlled to 4.7W8.0, and aryl aldehyde, etc. can be added at about 0.01W2g/l as a secondary brightenes[JP58034189A]