The Effect of Bath Parameters on the Ele

The electrocrystallisation of the alloys of Cox–Cu100−x onto stainless steel cathode was investigated by performing cyclic voltammetry (CV) to understand the mechanism of deposition. The deposit morphology and crystal structure of the deposit were analysed using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The kinetic parameters were obtained from the cathodic polarisation of the CV to predict the electron transfer mechanism (α) of the kinetic parameter revealed that both cathodic and anodic processes were nonsymmetrical. It was demonstrated that the current efficiency of the deposit increased from 96.8% at pH 4.0 to 99.2% at pH 7, and then it dropped to 89.7% at pH 8. Before the deposition of the Co–Cu alloy, the initial coherent deposition occurred at −0.24 V and peaked at −0.66 V. This was followed by the deposition of the Co–Cu alloy at −1.04 V, which occurred after the deposition potential of Cu2+ (−0.24 V) and Co2+ (−0.89 V). The percentage of cobalt content in the alloy was observed to decrease in at.% from 54.35% at pH 4 to 49.86% at pH 6 and further to 20.62% at pH 8. The morphology of the deposit characterised by the SEM showed that the deposit changed from a bitter to a regular curvilinear-like structure as the pH value changed from 4 to 8.