Abstract
Cobalt-nickel electrodeposition on steel substrate was carried out from solutions containing nickel sulfate, cobalt sulfate, sodium sulfate and sodium citrate and sodium acetate with 1 : 2 and 2 : 1 ratio respectively. The study dealt with the influence of bath composition, current density, pH, time of deposition, temperature and additives such as saccharin and thiourea on cathodic current efficiency. Throwing power and throwing index was calculated for the best bath for deposition. Also cyclic voltammograms was detected for the optimum bath composition. The efficiency for deposition from citrate-acetate mixed bath is higher than that reported for the separated citrate and acetate baths. The surface morphology of Ni-Co aHoy was investigated by using scanning electron microscopy (SEM) while the structure was studied by using X-ray diffraction analysis.
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