Ni-P-纳米Al_2O_3复合镀层耐磨性能研究

Study on the wear resistance performance of Ni-P-nano-Al_2O_3 composite coatings

本文通过在Ni-P合金化学镀液中加入纳米α-Al2O3颗粒,获得Ni–P–纳米Al2O3复合镀层。采用SEM对Ni–P–Al2O3复合镀层的表面形貌进行分析;采用EDX对复合镀层中的元素进行分析;用显微硬度计测量了不同Al2O3质量分数下镀层的硬度值;通过MM-W1立式万能摩擦磨损试验机对复合镀层的磨损性能进行了评价,并分析了复合镀层的磨损机理。结果表明:纳米Al2O3的加入可以增加镀层的硬度,并能有效地降低摩擦副之间的犁沟效应及摩擦表面发生粘着的面积,从而减少镀层的磨损。

Ni-P-nano-Al2O3 composite coatings were prepared by adding nano-Al2O3 particles to the Ni-P chemical plating solution. The morphology of the composite coatings was studied by SEM. The microhardnesses of Ni-P-nano-Al2O3 composite coatings deposited with different alumina content in the bath were measured by microhardness tester. The wear mechanism of Ni-P-nano-Al2O3 electroless composite layer was analyzed. Salt spray and electrochemical tests were carried out to examine the corrosion resistance of Ni-P-Al2O3 electroless composite coatings. The corrosion mechanism of coating was also simply discussed. The results show that the nano-Al2O3 particles can improve the composite layers＇ hardness and the plow effect between friction pairs as well as the area of friction surface being adhered be effectively reduced with the incorporation of Al2O3 particles, consequently, the mass-loss due to wear of composite plating layer is decreased.