Comparative study of graphene oxide-multifunctional oxide doping on corrosion resistance of electrodeposited nickel coatings in saline environments

For corrosive chloride solution, an excellent corrosion-resistant coating is required. In this view, introducing graphene oxide-modified Al2O3, TiO2, and MnO2 in a nickel matrix is a novel strategy for achieving this goal. Electrodeposition is used for manufacturing these nanocomposite coatings. The microstructure, electrochemical corrosion resistance, composition, and contact angle are then thoroughly investigated. Electrochemical results revealed that Ni-GO-TiO2 nanocomposite coating has a low corrosion current density of 10.86 μA/cm2 and a high charge transfer resistance of 2328 Ω cm2. Furthermore, the Ni-GO-TiO2 nanocomposite coating outlasts pure nickel films. The mechanism of GO-TiO2-promoted nickel corrosion resistance turns out to be that GO-TiO2 may impede the growth of nickel crystals and make them finer. Furthermore, this coating improves smoothness and reduces pores and cracks, resulting in less damage by chloride ions. Based on these findings, incorporating GO-TiO2 into nickel coatings may provide insights into preventing corrosion of steel pipelines exposed to chloride ions.