PROPERTIES OF ZN-NI ALLOY DEPOSITS FROM AMMONIUM BATHS

Zinc-nickel alloys have been electrodeposited from a simple bath containing only zinc, nickel and ammonium chlorides. The composition, morphology, structure and corrosion resistance of the alloys obtained with this bath have been studied and the influence of some additives, normally used to reduce the stress of the deposits, has also been analysed. Among these additives it has been found that the aromatic sulfonimide does not significantly modify the deposit characteristics but improves the corrosion resistance of the alloys. Moreover, the applicability of two statistical methods to a deposition process has been tested, to obtain the main factor determining the deposit composition.