Abstract
In this study, using 45# carbon steel as the substrate, a first experimental analysis was carried out on the polarisation behaviour of different component wattage plating solutions in order to determine the reasonable content of nanodiamond particles in a nickel/nanodiamond composite plating solution. Secondly, the effect of double-pulse forward and reverse duty cycle and reverse working time on the performance of nickel/nanodiamond composite plating was then investigated by testing the thickness, hardness and surface roughness of the composite plating and observing the surface micromorphology. The experimental results show that, when the content of nanodiamond particles in the plating solution is 5 g/L, the anti-pulse working time, forward and reverse pulse duty cycle of the double-pulse plating parameters are 20 ms, 0.3 and 0.2, respectively, and the composite plating layer prepared by double pulse has good comprehensive performance. This research work provides technical support for the optimisation of process parameters for the preparation of nickel/nanodiamond composite coatings by double-pulse electrodeposition.
Highlights
Compared to the ordinary composite coating, nanocomposite coating improves hardness, abrasion resistance and friction reduction
Researchers are paying more and more attention to Ni matrix reinforced with nanoparticles, especially nanodiamond particles [6,7,8]
When using DC electrodeposition to prepare deposits, the cations in the cathode area are constantly depleted and the ion concentration is not compensated in time
Summary
Compared to the ordinary composite coating, nanocomposite coating improves hardness, abrasion resistance and friction reduction. Unique mechanical and tribological properties, including high hardness and a low friction coefficient of ultra-fine nanodiamond powders, have caused researchers to conduct further investigations into their utilisation as coatings and as composite coatings. When using DC electrodeposition to prepare deposits, the cations in the cathode area are constantly depleted and the ion concentration is not compensated in time. The result is a certain gradient of concentration of cations and solutions in the cathode area. Coatings 2021, 11, 1068 cations in the cathode area are constantly depleted and the ion concen2torfa1t4ion is not pensated in time. The result is a certain gradient of concentration of cations and solu in the cathode area.
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