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Coatings 2019, 9(2), 148; https://doi.org/10.3390/coatings9020148

Synthesis and Properties of Electrodeposited Ni–Co/WS2 Nanocomposite Coatings

1
Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
2
National Centre for Advanced Tribology at Southampton (nCATS), University of Southampton, Southampton SO17 1BJ, UK
3
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
4
Engineering Materials and Surface Engineering, University of Southampton, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
Received: 17 January 2019 / Revised: 11 February 2019 / Accepted: 13 February 2019 / Published: 25 February 2019
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Abstract

Ni–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
Keywords: Ni–Co; WS2; hydrophobicity; low friction; nanocomposite Ni–Co; WS2; hydrophobicity; low friction; nanocomposite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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.

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