Electrodeposition and characterization of Co-BN (h) nanocomposite coatings

Co-BN (h) nanocomposite coatings were prepared by means of the conventional electrodeposition in a chloride solution containing different concentrations of hexagonal boron nitride particles, and pure Co coating was also prepared as a comparison. Morphology of the coatings and the effect of incorporated particles on metal matrix structure and composition were investigated via scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis. Microhardness, roughness, friction coefficient and wear resistance of the coatings were also evaluated using Vickers microhardness, stylus profilometer and pin-on disk machine. The results showed that Co-BN (h) nanocomposite coatings exhibit higher hardness and lower friction coefficient. Roughness and wear resistance compared with that of the pure Co coating obtained under the same electrodeposition condition and the wear mechanism of the coatings were also discussed.