Electroless Codeposition of Ni-P Composite Coatings: Effects of Graphene and TiO2 on the Morphology, Corrosion, and Tribological Properties

Given the excellent electrochemical and mechanical properties of graphene oxide (GO) and ceramic particles, excellent corrosion and tribological properties are expected when GO and TiO2 particles are incorporated into the Ni-P matrix. For this purpose, Ni-P composite coatings reinforced with GO and TiO2 ceramic particles were produced by electroless deposition. The structure, composition, morphology, microhardness, and corrosion resistance of the Ni-P and Ni-P composite coatings were analyzed using field emission scanning electron microscopy, X-ray diffraction, anodic polarization curves, and electrochemical impedance spectroscopy. The tribological behaviors of the Ni-P and Ni-P composite coatings were studied under dry conditions. The excellent corrosion and wear properties of the Ni-P-TiO2-GO composite coatings were attributed to the synergistic effects of the GO and TiO2 ceramic particles. It is expected that electroless Ni-P composite coatings reinforced with GO and TiO2 ceramic particles can establish a new trend, especially for engineering materials where wear resistance and corrosion are of importance. (C) The Minerals, Metals & Materials Society and ASM International 2019