Electro-brush plating of nickel-cobalt-alumina composite coating and its properties
[Introduction]The effects of different process parameters and Al2O3 nanoparticle dosage on electro-brush plating of Ni-Co-Al2O3 composite coating need to be studied to improve the wear resistance of 45 steel.[Method]The process parameters of electro-brush plating were optimized by observing surface and cross-section morphologies of Ni-Co-Al2O3 composite coating with scanning electron microscope,and then the effect of mass concentration of Al2O3 nanoparticles in electrolyte on the microhardness and wear resistance of Ni-Co-Al2O3 composite coating was studied.The wear mechanism of the composite coating was discussed based on morphology observation and elemental composition analysis of worn surface.[Result]The appropriate process parameters of electro-brush plating were determined as follows:voltage 10 V,temperature 40-50 °C,and moving rate of plating pen 6-8 m/min.The Ni-Co-Al2O3 composite coating obtained with 20 g/L of Al2O3 nanoparticles in electrolyte featured the highest microhardness(about 850 HV)and the best wear resistance.The wear mechanism of Ni-Co-Al2O3 composite coating was dominated by fatigue wear and accompanied by slight adhesive wear.[Conclusion]Ni-Co-Al2O3 composite coatings with high hardness and excellent wear resistance can be obtained on 45 steel by electro-brush plating.
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