电沉积制备Ni/nano-WC复合镀层的工艺及机理研究

Electrodeposition and mechanism of Ni/nano-WC composite coatings

摘要:

采用脉冲电沉积法制备了纳米WC强化镍基复合镀层。探究了不同表面活性剂（十二烷基硫酸钠）添加量以及WC粉的湿磨预处理对Ni/nano-WC复合镀层表面形貌、颗粒分布、微观结构以及显微硬度的影响。表面活性剂的添加和对WC湿磨处理有助于细化镀层晶粒，得到WC颗粒分布均匀的致密镀层。镀层中WC含量以及镀层的显微硬度随着表面活性剂的添加量的增加而增加，但过量会使效果变差，理想的SDS添加量为0.15g/l,湿磨10h。

Abstract:

In this study, nickel matrix composite coatings reinforced by nano WC were prepared by pulse current (PC) electrodeposition. The effects of surfactant sodium dodecyl sulfate (SDS) concentration and wet-milling treatment of WC particles on surface morphologies, distribution of particles, microstructures and microhardness values of Ni/nano-WC composite coatings were all investigated and the results were discussed. The results revealed formation of compact coatings with high contents of embedded WC particles and uniform distribution in presence of SDS and under wet-milling treatment of WC particles. The microhardness of the composite coatings also improved. The optimal coating was obtained by adding 0.15 g/l SDS under wet-milling for 10 h.