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采用化学镀技术制备了纳米α-Al2O3和γ-Al2O3颗粒增强的镍-磷复合镀层,利用X射线衍射仪、扫描电子显微镜、电子探针等对复合镀层的物相结构、表面形貌、成分分布进行了分析,还对比了复合镀层与镍-磷镀层的显微硬度、耐磨性和耐腐蚀性。结果表明:与镍-磷镀层相比,纳米Al2O3颗粒的加入没有改变镀层的晶体结构,但使镀层的显微硬度明显提高;纳米α-Al2O3颗粒的加入提高了镀层的耐腐蚀性和耐磨性,而纳米γ-Al2O3颗粒的加入反而使镀层耐磨性和耐腐蚀性下降。
The electroless nickel-phosphorus composite coatings with nano-α-Al2O3 and γ-Al2O3 particles were prepared by electroless plating. The phase structure, surface morphology and composition of the composite coatings were characterized by X-ray diffraction, scanning electron microscopy and electron probe. Distribution was also analyzed, but also compared the composite coating and nickel - phosphorus coating microhardness, wear resistance and corrosion resistance. The results showed that the addition of nano-Al2O3 particles did not change the crystal structure of the coating compared with the nickel-phosphorus coating, but the microhardness of the coating increased obviously. The addition of nano-α-Al2O3 particles improved the corrosion resistance and wear resistance of the coating However, the addition of nano-γ-Al2O3 particles on the contrary, the coating wear resistance and corrosion resistance decreased.