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采用电沉积方法在汽车传动部件用40Cr钢表面制备Ni-nanoSiC复合镀层。以复合镀层中SiC质量分数和复合镀层的硬度作为指标,通过正交实验优化施镀工艺参数,得到最佳施镀工艺参数:搅拌速度为300 r/min、镀液中SiC颗粒质量浓度为20 g/L、温度为50℃、阴极电流密度为14 A/dm2。结果表明:采用最佳施镀工艺参数制备的Ni-SiC复合镀层表面平整、组织致密,其磨损机制为轻度磨粒磨损,平均摩擦因数约为0.45,低于40Cr钢的0.6;磨损量约为6.27 mg,相比40Cr钢约降低25.6%。Ni-nanoSiC复合镀层能够提供有效的防护,改善和提高40Cr钢的抗磨损性能。
Electrodeposited Ni-nanoSiC composite coatings were prepared on the surface of 40Cr steel for automotive transmission components. Based on the SiC content and the hardness of the composite coatings, the optimal plating parameters were obtained by orthogonal experiments: the stirring speed was 300 r / min, the concentration of SiC particles in the bath was 20 g / L at a temperature of 50 ° C and a cathodic current density of 14 A / dm2. The results show that the Ni-SiC composite coating prepared by the optimum plating parameters has smooth surface and dense microstructure. The wear mechanism is mild abrasive wear, the average friction coefficient is about 0.45, lower than 0.6 of 40Cr steel; 6.27 mg, which is about 25.6% lower than that of 40Cr steel. Ni-nanoSiC composite coating can provide effective protection, improve and improve the wear resistance of 40Cr steel.