Abstract
Co–Cr and Co–Cr/ZrO2 coatings were electrodeposited from Cr (III) based baths. The effect of ZrO2 nanoparticles and heat treatment on structure, morphology, cross-section, hardness, and corrosion behavior of the coatings were investigated. The as-deposited Co–Cr coating had an amorphous structure and a nodular morphology that were not changed by the co-deposition of ZrO2 nanoparticles. However, the incorporation of ZrO2 particles decreased the density of micro-cracks within the coatings. According to the optical microscope observations, the micro-cracks were gradually formed within the electrodeposited coatings. The immediate heat treatment after the electrodeposition prevented the formation of micro-cracks and significantly decreased their amount. The results revealed that the composite coatings had a higher hardness and corrosion resistance than the unreinforced Co–Cr coating. The hardness and corrosion resistance of Co–Cr/5 g L−1 ZrO2 coating, as the optimum sample, were 1.2 and 7 times higher than those of the unreinforced electrodeposit. The heat treatment increased the hardness and the polarization resistance of Co–Cr/5 g L−1 ZrO2 coating by 1.5 and 3 times, respectively.
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