45#钢表面Ni-P-nano-SiC复合化学镀层的制备

在优化设计的化学镀基础镀液中通过添加不同含量的纳米SiC颗粒,研究在45#钢表面制备具有纳米SiC颗粒增强的复合镀层及形成机理.利用SEM,XRD和显微硬度计等方法对实验样品的组织结构、形貌、显微硬度及其镀层形成机理进行了研究,结果表明:实验制备的Ni-P,Ni-P-SiC镀层镀态时硬度分别为572 HV,649 HV,热处理后其表面硬度在400℃时达到最大值1 045 HV和1 341 HV.纳米SiC颗粒在镀液中不参与化学反应,只是与化学反应所产生的Ni和P共同沉积在镀层中起到了复合强化的作用.Ni-P-nano-SiC镀层的生长机理是按层状方式生长,生长方向垂直于钢基体表面.纳米SiC提...

Preparation of Electroless Composite Ni-P-nano-SiC Plating on 45# Steel

Electroless plating Ni-P composite coating reinforced with nano-SiC particles on the 45# steel substrate was prepared by adding different contents of nano-SiC particles in an optimized electroless bath.The microstructure,morphology,microhardness,and formation mechanism of the samples were analyzed using micro-hardness tester,scanning electron microscopy and X-ray diffraction.The results showed that the coatings of Ni-P,Ni-P-SiC are amorphous and the hardness values are 572 HV and 649 HV,respectively.The coa...