SummaryAn investigation has been undertaken to attempt to electrodeposit layered coatings of zinc, nickel and zinc-nickel alloy. A dual electrolyte approach has been applied with sequential layers being electrodeposited from the two baths. Coated steel substrates have been sectioned and examined using scanning electron microscopy and the layered nature of the deposits confirmed. Electrochemical and salt fog corrosion tests have been undertaken to ascertain the corrosion protection capabilities of various layered coatings. Preliminary data, particularly from the salt fog trials, suggests that some of the layered structures have considerably better protective qualities than similar thickness coatings of zinc and zinc-nickel alloy.
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Chawa et al. (1998) studied this question.