【摘要】 在传统的瓦特镀镍液中添加粒径约为50 nm的纳米Si C和纳米石墨(以[C]表示)颗粒，利用超声电沉积在紫铜板上分别制备了Ni–SiC和Ni–Si C–纳米石墨复合镀层。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对镀层的组织结构进行表征。通过在3.5%NaCl溶液中测量动电位极化曲线和电化学阻抗谱，对镀层的耐腐蚀性能进行评价。利用显微硬度计和微纳米综合力学性能测试仪对镀层的显微硬度和摩擦因数进行检测。结果表明，纳米Si C颗粒和纳米石墨的添加对镀层的择优取向产生影响，且均导致晶粒细化。与Ni–SiC复合镀层相比，Ni–Si C–[C]复合镀层的腐蚀电流密度及维钝电流密度增大，极化电阻和电荷转移电阻降低，显微硬度增大至330HV，摩擦因数降低为0.63。在Ni–SiC复合镀层的基础上，纳米石墨的加入有利于(111)和(200)晶面的生长，虽然不利于镀层耐腐蚀性能的提升，但镀层的力学性能和摩擦学性能获得改善。更多还原

【Abstract】 Nano-SiC and nano-graphite(coded as [C]) particles with a particle size of about 50 nm were added to a traditional Watt’s nickel plating bath to prepare Ni–SiC and Ni–SiC–[C] composite coatings on red copper sheets by ultrasound-assisted electrodeposition. The microstructure of the coatings were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The corrosion resistance of the coatings was evaluated by potentiodynamic polarization measurement and electrochemical impedance spectroscopy in a 3.5% NaCl solution. The microhardness and friction factor of the coatings were tested by using a microhardness tester and a micro-nano comprehensive mechanical tester.The results showed that the addition of nano-SiC particles and nano-graphite has an effect on the preferred orientation of coating, and both lead to the refinement of crystal grains. As compared with the Ni–SiC composite coating, the Ni–SiC–[C]composite coating had higher corrosion current density and passivity-maintaining current density, but lower polarization resistance and charge transfer resistance. The microhardness of the Ni–SiC–[C] composite coating was increased to 330 HV,and its friction factor was reduced to 0.63. Based on the Ni–SiC composite coating, the addition of nano-graphite is beneficial to the growth of(111) and(200) crystal planes, and improves the mechanical and tribological properties of coating, although it is not conducive to the improvement of corrosion resistance of the coating.更多还原