Abstract
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.
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