Jet Electrodeposition of Ni-SiO₂Nanocomposite Coatings with Online Friction and Its Performance

Abstract

To improve the surface quality and performance of Ni-SiO 2 nanocomposite coatings, jet electrodeposition of SiO 2 nanoparticles (diameter 20-30 nm) with Watt's nickel solution was used to process on graphite substrate accompanied by ceramic stick rolling and friction (R&F) online. The crystal structure and microstructure of coatings were analyzed by using X-ray diffraction and field emission scanning electron microscope, respectively. The corrosion resistance of the samples was evaluated by potentiodynamic polarization (Tafel). By studying the influences of different concentrations of SiO 2 in the solution and the effect of R&F on the coatings, we found that adding a certain amount of nano-SiO 2 in the solution can significantly increase the microhardness of coatings (from 550 HV to 627 HV or a 14% increase). R&F further caused the microhardness to reach 711 HV, which is a 20% increase relative to pure Ni coatings. Moreover, R&F can help to remove cellular bulge on the surface of nanocomposite coatings, thereby improving surface quality. The corrosion resistance of Ni-SiO 2 nanocomposite coatings is better than that of pure Ni coatings. In recent years, nanocomposite coating processed by electrodeposition has received widespread attention because it performs better than pure metal coating.1-2 In the process of electrodeposition, nanoparticles deposited in the coating as the second phase, thereby improving the performance of the coating.3-13 P. Baghery 14 obtained Ni-TiO 2 nanocomposite coating by using electrodeposition, which greatly improved the wear resistance and corrosion resistance of the coating. Ping Yu 15 improved the high-temperature oxidation resistance of Ni coatings by adding nano-SiO 2 to the solution. Yi Wang 16 obtained a Ni-W-SiO 2 coating by direct electrodeposition, which increased the microhardness by nearly 60 HV but worsened the surface quality.Ni-based coating is widely used as a protective layer for various mechanical instruments because of its excellent anti-corrosion property, wear resistance, high hardness, and good appearance. 1,6,8 Our team has conducted related research on this coating for years. [17][18][19][20] Nano-SiO 2 has a spherical microstructure, which can improve the strength and chemical resistance of materials. However, when nanoSiO 2 are deposited with nickel, the surface will form cellular bulges, 14 which influence the surface quality. Few studies focus on improving the surface quality of Ni-SiO 2 coating. To improve the hardness of Ni-based coating and solve the problem of cellular bulge, this paper proposes the use of jet electrodeposition to process nanocomposite coatings accompanied by ceramic stick rolling and friction (R&F) online. R&F prevents reunited particles from depositing into the coatings and removes surface bulge, thereby improving the quality of the coatings. ExperimentalExperimental device.-The experimental device is shown in Figure 1. The workpiece is fixed in a plating bath with a special fixture as the cathode. Plating solution is pumped into the a...

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