Electrodeposited Co-P alloy and composite coatings: A review of progress towards replacement of conventional hard chromium deposits
Electrodeposited Co-P alloy and composite coatings: A review of progress towards replacement of conventional hard chromium deposits
Hard chromium coatings have attracted much attention due to their strong tribological and corrosion performance. There is a global need to replace such coatings in industrial applications owing to technical problems, environmental concerns and legislation. Co-P electrodeposits are a promising alternative to hard chromium in a variety of engineering applications due to their appreciable microhardness and high corrosion resistance. Attractive magnetic, tribomechanical and electrical properties are evident together with excellent thermal stability. Environmentally acceptable process conditions may be used which allow controlled deposition on diverse workpieces across a wide scale. This review provides an overview of the influence of operational parameters, including type of current control, electrolyte composition, pH, current density and electrolyte agitation on the physicochemical and mechanical characteristics of the deposits. The incorporation of ceramic particles into Co-P electrodeposits to produce tailored composite coatings is also considered. An insight is given into the development of next generation alloy and composite deposits to replace hard chromium deposits from acidic Cr(VI) baths. Diverse applications for Co-P electrodeposits are considered and topics deserving further R & D are highlighted.
Alloy, Composite, Electrodeposition, Mechanical properties, Process conditions, Tribology
Safavi, S.
0a3fa6ce-72a4-4d0f-be3c-20a81ff2ef9b
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2
25 September 2021
Safavi, S.
0a3fa6ce-72a4-4d0f-be3c-20a81ff2ef9b
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2
Safavi, S. and Walsh, Frank C.
(2021)
Electrodeposited Co-P alloy and composite coatings: A review of progress towards replacement of conventional hard chromium deposits.
Surface and Coatings Technology, 422 (127564), [127564].
(doi:10.1016/j.surfcoat.2021.127564).
Abstract
Hard chromium coatings have attracted much attention due to their strong tribological and corrosion performance. There is a global need to replace such coatings in industrial applications owing to technical problems, environmental concerns and legislation. Co-P electrodeposits are a promising alternative to hard chromium in a variety of engineering applications due to their appreciable microhardness and high corrosion resistance. Attractive magnetic, tribomechanical and electrical properties are evident together with excellent thermal stability. Environmentally acceptable process conditions may be used which allow controlled deposition on diverse workpieces across a wide scale. This review provides an overview of the influence of operational parameters, including type of current control, electrolyte composition, pH, current density and electrolyte agitation on the physicochemical and mechanical characteristics of the deposits. The incorporation of ceramic particles into Co-P electrodeposits to produce tailored composite coatings is also considered. An insight is given into the development of next generation alloy and composite deposits to replace hard chromium deposits from acidic Cr(VI) baths. Diverse applications for Co-P electrodeposits are considered and topics deserving further R & D are highlighted.
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Accepted/In Press date: 24 June 2021
e-pub ahead of print date: 30 July 2021
Published date: 25 September 2021
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© 2021 Elsevier B.V.
Keywords:
Alloy, Composite, Electrodeposition, Mechanical properties, Process conditions, Tribology
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Local EPrints ID: 452535
URI: http://eprints.soton.ac.uk/id/eprint/452535
ISSN: 0257-8972
PURE UUID: 5df7c896-a859-41ed-b077-0e7a089a43c7
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Date deposited: 11 Dec 2021 11:26
Last modified: 05 Jun 2024 18:27
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S. Safavi
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