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Electro-brush plating of nickel-tungsten-cobalt-nano silicon carbide composite coating and its properties
Pages: 10-13
Year: Issue:  1
Journal: Electroplating & Finishing

Keyword:  nickel-tungsten-cobalt alloysilicon carbideelectro-brush platingnanocomposite coatingtribology;
Abstract: A Ni-W-Co-n-SiC (nano silicon carbide) composite coating was prepared on the surface of 45 steel by electro-brush plating. The bath composition and process conditions are as follows: NiSO4·7H2O 393 g/L, Na2WO4·2H2O 23 g/L, H3BO331 g/L, citric acid 42 g/L, Na2SO46.5 g/L, CoSO4·7H2O 3 g/L, NaF 5 g/L,n-SiC 0-30 g/L, temperature 25-45 °C, pH 1.4-2.4, voltage 5-7 V, moving rate of plating pen 0.8 m/s and time 25 min. The suitable voltage for composite electro-brush plating was determined as 6 V based on the evaluation of appearance using a Ni-W-Co alloy coating as the standard. The effect ofn-SiC content in bath on the structure, microhardness and friction-wear performance of the nanocomposite coating was studied. The results showed that a crack-free Ni-W-Co-n-SiC composite coating with uniformly distributed particles can be obtained from the bath containing 15-25 g/L SiC nanoparticles. With increasingn-SiC content in bath, the crystallization degree, solid solubility of Ni, as well as microhardness and wear resistance of composite coating are increased, while the friction coefficient of the composite coating surface is changed little.
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