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 alumi-num alloy surfaces using electroplating method. The effects of varying diamond particle content in the coating on the coating' s elemental compo-sition,surface morphology,microhardness,corrosion resistance and wear resistance were investigated using wavelength dispersive X-ray fluo-rescence 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 parti-cle 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.
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