Abstract：Ni-diamond composite was electroplated on WC-10Co cemented carbide substrate by sand-falling process. The effects of main salt concentration, temperature and pH value on the nucleation overpotential of nickel were investigated by cyclic voltammetry to optimize the process parameters of co-electroplating. Based on the optimized process parameters, the effect of substrate pretreatment method on the area fraction of diamonds was investigated. The adhesive strength between the plating and the cemented carbide substrate as well as between the diamonds and the nickel substrate was tested by thermal shock. The results show that, under the process conditions of main salt concentration 280 g/L, temperature 40 ℃, pH4, current density 0.015 A/cm2 and diamond powder concentration 2.3 g/L, nickel and diamond (W10, with an average particle size of around 10 μm) can be co-deposited with high quality. The plating is chracterized with a dense microstructure, even distribution of diamond and high adhesive strength. The area fraction of diamonds in the plating reaches 36.9% by 1500 mesh diamonds polising and chemical etching.
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2019, Vol. 24 
