Ni-based nanocomposite coatings reinforced with Ni60Cr10Ta10P16B4 metallic glass powders have been successfully deposited by a direct current electrodeposition method in a typical Watt's bath. The effect of the glassy particles content on the microstructure, micro-hardness and corrosion behavior of the coatings have been evaluated. The structural investigations have been conducted by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The corrosion behavior of the coatings has been investigated in a 3.5 wt % NaCl solution by a potentiostat-galvanostat device in the potentiodynamic polarization mode. The composite coatings with the negligible amounts of porosity and crack, homogeneous distribution of the glassy particles, and appropriate bonding at the matrix/reinforcement interface are obtained. The results demonstrate that the crystallographic texture and surface morphology of the coatings are significantly changed by the addition of the glassy particles into the bath. A minimum matrix crystallite size of 31 nm and maximum glassy particles incorporation of about 6.4 vol% are obtained for the particles concentration of 10 g/L in the deposition bath. The microhardness of the coating is enhanced with increasing the content of the reinforcing particles in the bath and reaches a maximum value of 475 HV for the particles concentration of 10 g/L. Moreover, the corrosion current density and corrosion rate are significantly reduced from 2.25 μA/cm2 and 0.958 MPY for the pure Ni coating to 0.05 μA/cm2 and 0.021 MPY for the nanocomposite coating.
(2006) Low C.T.J. et al.
(2007) Chaparro A. et al.
(2004) Lung Kuo Sh. et al.
(2014) Shakoor R.A. et al.
Corrosive synthesis and enhanced electromagnetic absorption properties of hollow porous Ni/SnO2 hybrids. (2015) Biao Zhao et al.
Corrosion resistance of Ni–Co alloy and Ni–Co/SiC nanocomposite coatings electrodeposited by sediment codeposition technique (2014) Bakhit Babak et al.
Electrodeposition and characterization of Ni–Y 2O 3 composite (2011) Tian Liangliang et al.