Abstract
An electroless NiCoP plating solution, which composed of lactate-citrate-ammonia as buffering and complexing agents, has been prepared. Various electroless NiCoP coatings were deposited from this solution to investigate the effects of ion concentrations, pH and bath temperatures on the chemical composition of the deposited coating. The results showed that the present electroless NiCoP plating solution has a potential for depositing NiCoP coatings with an average composition of 71mass% Ni, 17mass% Co and 12mass% P. The plating solution showed a good stability to deposit the coatings with a small deviation in compositions over wide ranges of pH values in acid region, bath temperatures, cobalt-ion and hypophosphite-ion concentrations. The nickel content of the NiCoP coating could be tailored by varying nickelion concentrations of plating bath. The Ni content increased with increasing nickel-ion concentration while the opposite trend was observed for Co content. However, plating in the alkaline region showed significant changes in coating composition and plating behavior. Systematic UV visible absorption measurement showed the change of complex ions from acid to alkaline regions, which could explain the different plating behavior in those regions. [doi:10.2320/matertrans.M2012292]
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