Abstract
In this paper, NiW/SiO2 composite coatings were prepared on Q235B steel using the electrodeposition technique. The relationship between the concentration of SiO2 nanoparticles in the plating solution and the properties of NiW/SiO2 composite coating was investigated. The results show that the addition of an appropriate amount of SiO2 nanoparticles in the plating solution can enhance the cathode current, increase the surface hardness, improve the corrosion resistance, and reduce the roughness of the composite coating. The SiO2 nanoparticles covered on the coating surface can penetrate the lattice of NiW alloy to induce heterogeneous nucleation, and play a role in refining grain. However, when the SiO2 nanoparticles in the plating solution reaches 8 g/L, the agglomeration phenomenon occurs due to excessive nanoparticles, which will increase the roughness and decrease the compactness, resulting in the decrease of hardness and corrosion resistance. The NiW/SiO2 composite coating electrodeposited from the solution containing 6 g/L SiO2 nanoparticles exhibits the best hardness (643.23 HV) and the greatest corrosion resistance with the smallest corrosion current density (9.7 μA/cm2).
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