Advancement of Novel Graphene Oxide Embedded Alumina Nickel Composite Coating Developed at Various Current Densities to Evaluate Corrosion Resistance

Abstract

In this research, the influence of deposition current density on the properties of nickel-Graphene oxide/alumina coatings produced by electrodeposition was examined. Nickel matrix composite coatings with graphene oxide doped Alumina (GO-Al₂O₃) particles were prepared via electrodeposition. When embedding GO-Al₂O₃ particles in the Ni matrix, remarkable anti-corrosion properties are anticipated due to the outstanding mechanical properties of GO and Al₂O₃. The structure, content, and morphology of GO, GO-Al₂O_3, and coatings deposited at various current densities were determined using X-ray diffraction, Fourier transforms infrared spectroscopy, Field emission Scanning electron microscopy, and energy-dispersive X-ray spectroscopy. GO-doped alumina particles were successfully incorporated into the matrix of nickel, according to the findings. Porosity measurement and cross-sectional thickness were also investigated at various current densities. Potentiodynamic polarization testing and electrochemical impedance spectroscopy were used to study the coatings' corrosion-resistant characteristics. According to the findings, coatings developed at high current densities, such as 30 mA cm^-2, are porous and not uniform in nature. Furthermore, at high current densities, the content of GO and Alumina is reduced, resulting in a decrease in mechanical and corrosion resistance. Due to its less porous and uniformly formed coating, 10 mA cm^-2 was the optimum current density for achieving the most desirable features.