The Effect of Co Content on The Microstructure of Nickel-Cobalt (Ni-Co) Alloy Coatings

In this study, Ni-Co alloy coatings were prepared on the steel substrates with electrodeposition method from a sulphate baths using power supply. The effect of Co content in electrolyte on the composition, phase structure and surface morphology of alloy coating were investigated. The prepared coatings were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). According to the results, Co concentration in the electrolyte affects the properties of the Ni-Co alloy coating layer. There is a serious increase of Co content deposited Ni-Co alloy coating when the Co concentration is increased in the electrolyte. The both FCC and HCP crystal structures of Ni-Co alloy coating layer began to transformin into HCP structure with increasing amount of Co content. At the same time, a change in the surface morphology was observed with an increase in Co ratio in the alloy coating layer and a more granular structure was formed