电沉积纳米晶Ni-Co-Fe-P合金镀层的组织结构与摩擦磨损性能

用脉冲电沉积方法制备了纳米晶N i-Co-Fe-P合金镀层.采用X射线衍射（XRD）,透射电镜（TEM）,扫描电镜（SEM）,能谱分析（EDS）等方法研究了合金镀层的微观组织结构和成份.采用显微硬度计和摩擦磨损试验机测试合金镀层的显微硬度和摩擦磨损性能.结果表明：纳米晶N i-40.41%Co-6.16%Fe-1.63%P合金镀层的晶粒尺寸为8.3 nm,显微硬度和耐磨性明显高于不含P的N i-Co-Fe镀层;适当温度退火可以提高镀层的硬度及耐磨性;镀层的耐磨性与其硬度成正相关,且随着硬度的提高,镀层的磨损机理由磨粒磨损和黏着磨损共同作用转变为磨粒磨损主导.

Microstructure and Tribological Properties of Electrodeposition Nanocrystalline Ni-Co-Fe-P Alloy Coating

Nanocrystalline (nc) Ni-Co-Fe-P alloy coatings were synthesized by pulsed electrodeposition. The structure, surface morphology and composition of nc Ni-Co-Fe-P alloy coating were studied by XRD, TEM, SEM and EDS. The effects of alloying with phosphorus and subsequent heat treatment on the wear resistance of nc Ni-Co-Fe-P alloy were studied using a friction-wear tester. The results indicate that the grain size of nc Ni-40.41%Co-6.16%Fe-1.63%P alloy coating was only 8.3 nm, and the hardness and wear resistance of nc Ni-Co-Fe-P alloy were higher than that of nc Ni-Co-Fe alloy coating. The hardness and wear resistance of nc Ni-Co-Fe-P alloy were improved by heat treatment. There was a positive relationship between the wear resistance and hardness, and the wear mechanism changed gradually from abrasive and adhesion wear to abrasive wear with increasing hardness of nc Ni-Co-Fe-P alloy.