双脉冲电沉积法制备的镀层比直流电沉积层在硬度、应力、耐蚀性方面更佳,目前就双脉冲法制备的Ni-SiC复合镀层的摩擦学行为的研究较少.为此,利用直流和双脉冲2种电沉积方法制备了Ni-SiC复合镀层,研究了加入SiC颗粒对2种复合镀层微观结构和室温干摩擦条件下磨损性能的影响,并将两者进行比较.利用X射线衍射仪(XRD)检测了镀层的微观结构,通过扫描电镜(SEM)观察了镀层的磨损表面,分析了磨损机理.结果表明:脉冲方法能够更有效地提高镀层硬度,降低宏观残余应力,随着SiC颗粒含量的增加,Ni-SiC复合镀层的摩擦系数减小,磨损率降低.
Ni-SiC composite coatings were prepared on AISI-1045 steel disc by using direct current electrodeposition and reverse-pulse electrodeposition. The effect of SiC particles on the microstructure and dry sliding friction and wear behavior of the composite coatings was investigated. The crystal structure of the composite coatings was analyzed by means of X-ray diffraction. The morphology of the worn surfaces of the composite coatings was observed by using a scanning electron microscope. Results indicate that Ni crystallites in the composite coating prepared by reverse-pulse electrodeposition are preferentially oriented along [111] texture,which contributes to the more effective increase of the hardness and decrease of the macro-residual stress of the composite coatings. Moreover, the friction coefficient and wear rate of the composite coatings decreased with increasing content of SiC, and the composite coating prepared via reverse-pulse electrodeposition showed better friction-reducing and antiwear ability than the one prepared via direct current electrodeposition.
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