Synthesis and Properties of Electrodeposited Ni–Co/WS2 Nanocomposite Coatings
AbstractNi–Co coatings have gained widespread attention due to their potential in replacing hard chromium deposits (which have traditionally utilized toxic and corrosive chromic acid baths). A major challenge is to lower the high coefficient of friction of coated surfaces against steel, under dry sliding conditions. In this research, low friction Ni–Co/WS2 nanocomposite coatings have been prepared by a convenient, one-pot electrodeposition from aqueous Ni–Co plating baths containing WS2 particles. The embedment of the WS2 lubricants is found to reduce the friction coefficient of coating significantly, and an ultra-low friction coefficient of 0.16 is obtained for the coating having a WS2 content of 7.1 wt.%. Morphology and composition characterization of wear tracks reveal that the formation of a WS2-rich lubricating tribofilm on the contact surfaces is beneficial to a low friction coefficient and good oxidation resistance. The wettability of electrodeposited coatings was also investigated. Compared to pure Ni-Co coating, the Ni–Co/7.1 wt.% WS2 coating has an excellent hydrophobicity with a high water contact angle (WCA) of 157°, due to a rough surface with dual scale protrusions and the low surface energy of WS2. View Full-Text
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He, Y.; Wang, S.; Sun, W.; Reed, P.A.; Walsh, F.C. Synthesis and Properties of Electrodeposited Ni–Co/WS2 Nanocomposite Coatings. Coatings 2019, 9, 148.
He Y, Wang S, Sun W, Reed PA, Walsh FC. Synthesis and Properties of Electrodeposited Ni–Co/WS2 Nanocomposite Coatings. Coatings. 2019; 9(2):148.Chicago/Turabian Style
He, Yang; Wang, Shuncai; Sun, Wanting; Reed, Philippa A.; Walsh, Frank C. 2019. "Synthesis and Properties of Electrodeposited Ni–Co/WS2 Nanocomposite Coatings." Coatings 9, no. 2: 148.
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