Structure and properties of Ni–P–graphite (C_g)–TiO₂ composite coating

Abstract

Titanium dioxide (TiO₂) and graphite (C_g) particles were co-deposited with nickel–phosphorous (Ni–P) coatings through electroless deposition process. Surface morphology of the coatings was analysed by scanning electron microscope (SEM). X-ray diffraction (XRD) was used to detect the structure of the coatings. Microhardness of Ni–P–C_g–TiO₂ composite coating showed a moderate hardness between Ni–P–C_g and Ni–P–TiO₂ composite coating. DSC thermograms indicated that the thermostability of Ni–P coating could not be affected by TiO₂ and/or C_g particles. Moreover, the friction coefficient and corrosion rate of Ni–P–TiO₂ composite coating could be decreased by the addition of graphite particles.

Keywords:

• Ni–P–C_g–TiO₂
• Phase transition
• Microhardness
• Friction
• Corrosion