Preparation of nickel-based composite coating materials

1. Ultrasonic plating method
Ultrasonic technology in the metal plating reaction process to produce the effect of the main pathway is to rely on the cavitation effect and the synergistic effect of micro-jet to further enhance the plating deposition reaction process of particles in the mass transfer process and further affect the nucleation process, thereby effectively improving the metal plating deposition process in the actual deposition rate and coating properties. Ultrasonic plating method can be used to prepare composite coatings, composite electrodeposition coating technology refers to some very refractory solid particles such as Al2O3, SiC, TiO2, diamond powder and graphene nanoparticles or some other particles are uniformly added to the plating liquid system, along with the deposition of the metal ions and uniformly dispersed, and orderly distribution of the coating to form composite materials. Composite materials usually have greater hardness, better wear resistance, more resistant to high temperatures and other characteristics, some composite materials also have good friction reduction performance, surface self-lubrication and other characteristics. In recent years, ultrasonic generator system has gradually been widely used in electroplating process in this professional field, to achieve efficient inhibition of particle agglomeration effect, so that the plating process of particles more orderly distribution to be used in the field of metal composite plating.
2. Jet electrodeposition method
Wang et al. used jet electrodeposition method to obtain a nickel-based nano-ceramic composite coatings, found that the friction of jet electrodeposition is not fixed, which can be moved and more flexible, through the effective adjustment of the deposition current density and cathodic scanning rate, to enhance the composite coating deposition reaction rate at the same time also improve the quality of electroplating, but also will make the chemical corrosion resistance of the coating has been significantly improved. Li et al [2]. Li et al. produced Ni-Co/BN(H) nanocomposite coatings on the surface of steel C1045 by pulse jet electrodeposition. Research and experimental data show that pulse jet electrodeposition coating when the duty cycle, pulse frequency conditions such as changes in the microhardness of the surface of the coating has a similar effect on the change of microhardness of the surface of the plating, pulse parameters will lead to improve the surface microhardness of the plating surface will also be the first gradual increase and then gradually decline in the trend of change.
3. Direct current deposition method
As a method of preparing nickel-based alloy coatings with simple equipment requirements, convenient operation and low cost, DC electrodeposition has a wide range of applications. Cao Jing et al. found that the use of direct current electrodeposition method of nickel-based metal composite coatings in the SiC particles mass fraction will gradually increase with the increase in deposition current density, because the rapid increase in deposition current density, on the one hand, can make the non-metallic particles and other metal particles of the resonance of the deposition of the rate of movement increased dramatically, on the other hand, the electrode can be greatly strengthened between the electric field force to promote the original adsorption in the anionic interface On the other hand, the electric field force between the poles can be greatly strengthened, promoting the particles originally adsorbed near the anion interface to migrate and diffuse to the cathode together with other metal ions, so that the content of particles in the plated layer increases. However, compared with other electrodeposition methods, the grains of nickel-based composite coatings obtained by DC electrodeposition are still rough, and there are cracks and pore defects.
4. Pulse electrodeposition method
Compared with the traditional DC electrodeposition method which can only adjust and control the electrode parameters, pulse electrodeposition method with adjustable waveform parameters can further improve the deposition rate of the prepared layer, and the enhancement of the electrochemical properties of the layer is also more significant. When SiC/Ni-Co composite coatings were produced by bi-directional pulsed electrodeposition, Fangfang Shi et al. found that the surface of the SiC/Ni-Co coatings became smooth and even, the crystallisation became finer and more homogeneous, and the electrochemical corrosion resistance of the surface of the composite coatings was significantly improved.Wang et al. used the principle of pulsed electrodeposition to prepare a Ni-TiO2 nanocomposite coating material and to investigate its performance parameters. Wang et al. prepared Ni-TiO2 nanocomposite coatings using the principle of pulsed electrodeposition and tested their performance parameters, and found that due to the use of pulsed electrodeposition technology for the preparation and addition of TiO2 nanopowder, the size of the grains will gradually become smaller, and the mechanical properties of the surface of the Ni alloy plating layer will also be gradually enhanced accordingly.