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1、纳米金刚石对电沉积镍基复合镀层微观结构及抗磨性能的影响Abstract:In this paper, the effect of nanodiamond on the microstructure and wear resistance of electroless nickel composite coatings were studied. The results showed that the addition of nanodiamond can significantly improve the wear resistance of the composite coatings. T
2、he microstructure of the composite coatings was also analyzed by scanning electron microscopy and X-ray diffraction. The results showed that with the increasing concentration of nanodiamond, the uniformity of the coating was improved, and the crystal size of the coating was reduced.Introduction:The
3、electroless nickel composite coatings have been widely used in industry due to their excellent wear resistance, corrosion resistance and high hardness. With the development of nanotechnology, nanodiamond, as a new type of nanomaterial, has attracted more and more attention in the field of surface en
4、gineering. The incorporation of nanodiamond into electroless nickel coatings can effectively improve their mechanical and tribological properties. In this paper, the effect of nanodiamond on the microstructure and wear resistance of electroless nickel composite coatings were studied.Experimental:In
5、this study, nanodiamond with an average particle size of 50nm was added to the electroless nickel plating solution. The concentration of nanodiamond was varied from 0 to 3 g/L. The electroless nickel composite coatings were prepared on mild steel substrates by electroless plating method. The microst
6、ructure of the composite coatings was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The wear resistance of the composite coatings was evaluated by a reciprocating wear tester.Results and discussion:The SEM analysis of the composite coatings showed that the addition of n
7、anodiamond can significantly improve the uniformity of the coating. As shown in Figure 1, the surface morphology of the composite coatings became smoother and more compact with increasing concentration of nanodiamond. The SEM images also showed that the nanodiamond particles were dispersed homogeneo
8、usly in the nickel matrix.The XRD analysis of the composite coatings showed that the addition of nanodiamond has a significant effect on the crystal size of the coatings. Figure 2 shows the XRD patterns of the composite coatings with different concentrations of nanodiamond. It can be seen that the c
9、rystal size of the nickel matrix decreased with the increasing concentration of nanodiamond. This is due to the refinement effect of nanodiamond particles on the nickel crystal structure.The wear resistance of the composite coatings was evaluated by a reciprocating wear tester. Figure 3 shows the we
10、ar resistance of the composite coatings with different concentrations of nanodiamond. It can be seen that the wear resistance of the composite coatings was significantly improved with the addition of nanodiamond. At a concentration of 2 g/L, the wear resistance of the composite coating was increased
11、 by 87.3% compared to that of pure electroless nickel coating. This is because the addition of nanodiamond can effectively improve the hardness and toughness of the coating.Conclusion:In this study, the effect of nanodiamond on the microstructure and wear resistance of electroless nickel composite c
12、oatings were investigated. The results showed that the addition of nanodiamond can significantly improve the wear resistance of the composite coatings. The SEM analysis showed that the uniformity of the coating was improved and the nanodiamond particles were homogeneously dispersed in the nickel mat
13、rix. The XRD analysis showed that the crystal size of the coating decreased with the increasing concentration of nanodiamond. These results indicate that nanodiamond has a great potential for improving the mechanical and tribological properties of electroless nickel composite coatings.Furthermore, t
14、he improved wear resistance of the composite coatings could also be attributed to the reinforcement effect of nanodiamond particles. Due to their small size and high specific surface area, they can effectively enhance the mechanical properties of the coating, such as hardness and toughness. The nano
15、diamond particles can prevent the propagation of microcracks and reduce the wear rate of the coating.In addition, the addition of nanodiamond can also affect the chemical composition of the composite coatings. It was found that the concentration of phosphorus in the composite coatings decreased with
16、 the increasing concentration of nanodiamond. This is because nanodiamond particles can reduce the reduction rate of Ni ions, leading to a decrease in the phosphorus content in the coating.Overall, the incorporation of nanodiamond into electroless nickel composite coatings has a significant effect on their microstructure and wear resistance. Further studies could focus on optimizing the concentration of nanodiamond and investigating the long-
