Composition and process for the electrodeposition of...

Details Composition and process for the electrodeposition of... Composition and process for the electrodeposition of...

C - Chemistry, Metallurgy

25

D

204/26

C25D 3/56 (2006.01)

Patent

CA 1210732

ABSTRACT OF THE DISCLOSURE In accordance with the present invention there is provided an aqueous electroplating bath hav- ing a pH of from about 4.7 to 8.0, which bath contains at least 10 g/l zinc, 15 g/l nickel, at least 20 g/l ammonium, ions, a weight ratio of nickel/zinc, of at least 0.5 and a brightening/grain refining amount of a nonionic polyoxyalkylated surfactant. Electrolysis of this electroplating bath produces a uniform, fine grained zinc-nickel alloy electrodeposit which is at least semi-bright in appearance and which contains at least 5% by weight of nickel. The thus-produced nickel alloy electrodeposit provides excellent corrosion re- sistance to the substrate, such as steel, on which it is plated. In a preferred embodiment the electroplating bath of the present invention may also contain an aro- matic aldehyde or aromatic ketone as a secondary brightener to produce a full, mirror bright deposit. Alternatively, or in addition to the secondary bright- ener, the bath may contain a lower alkyl carboxylic acid or salt thereof, as an auxiliary low current density area brightener.

409819

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