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采用化学镀的方法,调整Ni-P化学镀工艺参数及使用热处理工艺,获得了不同微观结构的镀层。并使用电子探针,XRD,显微硬度测试仪及摩擦磨损试验仪研究了镀层性能。结果表明,增加镀层纳米相含量可以提高镀层的显微硬度,其值可以达到400℃热处理时的硬度。强化机理包括固溶强化和析出强化,这取决于镀层中的磷含量和热处理温度。进一步的摩擦磨损实验结果表明,纳米相含量高的镀层在400℃热处理前后均表现出较好的显微硬度以及较低的摩擦系数,具有良好的抗磨损能力。
The method of electroless plating is adopted to adjust the Ni-P electroless plating process parameters and the heat treatment process to obtain the coating with different microstructures. The coating properties were studied by using electron probe, XRD, microhardness tester and friction and wear tester. The results show that increasing the coating nano-phase content can increase the microhardness of the coating, the value can reach the hardness of 400 ℃ heat treatment. The strengthening mechanisms include solid solution strengthening and precipitation strengthening, depending on the phosphorus content in the coating and the heat treatment temperature. Further experimental results of friction and wear show that the coating with high nano-phase content shows better microhardness and lower friction coefficient before and after heat treatment at 400 ℃, and has good wear resistance.