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Synthesis and properties of electrodeposited Ni–Co/WS2 nanocomposite coatings

Synthesis and properties of electrodeposited Ni–Co/WS2 nanocomposite coatings
Synthesis and properties of electrodeposited Ni–Co/WS2 nanocomposite coatings
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 deg, due to a rough surface with dual
scale protrusions and the low surface energy of WS2.
Ni–Co, WS2, Hydrophobicity, Low Friction, Nanocomposite
2079-6412
1-12
Yang, He
8c40b82b-b52b-4258-a0f4-d0aa3d1b7df0
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Sun, Wanting
67cb2890-35df-4982-adec-16c01d9b6e76
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2
Yang, He
8c40b82b-b52b-4258-a0f4-d0aa3d1b7df0
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Sun, Wanting
67cb2890-35df-4982-adec-16c01d9b6e76
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2

Yang, He, Wang, Shuncai, Sun, Wanting, Reed, Philippa and Walsh, Frank (2019) Synthesis and properties of electrodeposited Ni–Co/WS2 nanocomposite coatings. Coatings, 9 (2), 1-12, [148]. (doi:10.3390/coatings9020148).

Record type: Article

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 deg, due to a rough surface with dual
scale protrusions and the low surface energy of WS2.

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Accepted/In Press date: 13 February 2019
Published date: 25 February 2019
Keywords: Ni–Co, WS2, Hydrophobicity, Low Friction, Nanocomposite

Identifiers

Local EPrints ID: 429731
URI: http://eprints.soton.ac.uk/id/eprint/429731
ISSN: 2079-6412
PURE UUID: 602d66cf-0560-4fd1-977b-7449f716352d
ORCID for Philippa Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 04 Apr 2019 16:30
Last modified: 07 Oct 2020 01:37

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