NiP -ZrO2 coatings were applied to #45 steel workpieces to extend their practical lifespans. With the assistance of a steady-state magnetic field, a NiP plating solution containing 50 nm ZrO2 nanoparticles was used to electroplate a composite coating on the surface of #45 steel. The coating growth mechanism of both non-magnetically-assisted and magnetically-assisted coatings was established. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were used to explore the microstructure and elemental composition of coatings. According to the analyses, the different properties of coatings, especially their corrosion resistance and wear resistance were significantly improved when a stable magnetic field was used. The use of a stable magnetic field during the coating application effectively improved its surface quality, nanoparticle content, hardness, corrosion resistance, and wear resistance.

In order to study the processing mechanism of jet electrodeposition and explore the influence of different scanning speed on the wear and corrosion resistance of nickel-based coating prepared by jet electrodeposition. The reciprocating scanning motion of the nozzle was used to prepare the nickel-based coating in a specific area. Combined with COMSOL software, the coupling effect of multiple physical fields in the process of jet electrodeposition at different scanning speeds was numerically calculated. Scanning electron microscope, microhardness tester, material surface comprehensive performance tester and electrochemical workstation were used to analyze the surface morphology, section thickness, microhardness, abrasion resistance and corrosion resistance of the nickel-based coating prepared by jet electrodeposition at different scanning speeds. Results show that with the increase of scanning speed, coating grain size decreases, and the coating thickness increases after the first decreases, and microhardness increase after decreases first, abrasion resistance and corrosion resistance were lower after increase first, When the scanning speed reaches 600mm/min, the jet electrodeposited nickel-based coating has the best performance, the maximum thickness reaches 24.83μm, the microhardness reaches 616.86HV, and the wear scar area is 2766.75μm2. In addition, the self-corrosion potential is -0.33V, the self-corrosion current density is 5.16E-7A·cm2, and the equivalent impedance is 4660Ω. The experimental results are consistent with the simulation results, which verifies the accuracy of the simulation model and provides theoretical guidance for further experiments related to jet electrodeposition.