Study on the Preparation and Performance of Ni-P/Diamond Composite Coatings on 2014 Aluminum Alloy Surfaces

In order to enhance the wear resistance of aluminum alloy surfaces，Ni-P/diamond composite coatings were prepared on 2014 aluminum alloy surfaces using electroplating method.The effects of varying diamond particle content in the coating on the coating’s elemental composition， surface morphology， microhardness， corrosion resistance and wear resistance were investigated using wavelength dispersive X-ray fluorescence spectroscopy， scanning electron microscopy (SEM)， Vickers hardness testing， electrochemical workstation and friction-wear testing machine.Results showed that as the concentration of diamond particles in the plating solution increased from 0 to 1.0 g/L，the corrosion current density decreased and the corrosion potential increased.The micro Vickers hardness improved from 526 to 786 HV0.5.When the diamond particle concentration was 1.0 g/L， the coating exhibited the lowest wear rate.With the increase in diamond content， the wear mechanism of the coating transitioned from fatigue wear to a combination of fatigue and adhesive wear， eventually shifting to predominantly adhesive wear.