Wear and corrosion behaviour of cobalt-nickel-graphene(Co-Ni-G) nanocomposite coatings

Researchers focus on the use of graphene-based nanocomposite coatings to protect steel surface in industries and enhance their wear & corrosion behaviour. Comparison of wear and corrosion properties have been attempted for Cobalt-Nickel (Co-Ni), Cobalt-Nickel with 0.15 wt % (Co-Ni-G 0.15 wt %) & Cobalt-Nickel with 0.45 wt % (Co-Ni-G 0.45 wt %) of graphene coatings on mild steel substrates by pulsed electrodeposition method. The electrolyte solution used for pulsed electrodeposition consists of cobalt chloride and nickel chloride,graphene with required binders. The test results suggest that the addition of graphene in the Co-Ni-G 0.45 wt % nanocomposite coating matrix improves wear resistance and ductile load bearing capacity. The existence of graphene in the Co-Ni composition resulted in improved grain strength and effective control over grain size, which forms an aggregated cauliflower morphology with an increase in coating thickness. This also helped Co-Ni-G 0.45 wt % to exhibit better corrosion resistance than the plain Co-Ni coating.