Electrodeposition And Tribological Properties Of Ni-srso_4 Composite Coatings

摘要

Ni-SrSO_4 composite coatings were electrodeposited on superalloy Inconel 718 from a Watts electrolyte containing a SrSO_4 suspension. Ni-SrSO_4 coatings were investigated by scanning electron microscope, microhardness tester, and friction and wear tester in sliding against a bearing steel ball under unlubricated condition. The incorporation of SrSO_4 into Ni matrix increases the microhardness of electrodeposited coatings. Ni-SrSO_4 composite coating exhibits a distinctly low friction coefficient and a small wear rate as contrasted with pure Ni coating and the substrate. The effect of SrSO_4 particles on microstructure and tribological properties of Ni-SrSO_4 composite coatings is discussed.