Micro- and nano-scale tribo-corrosion of cast CoCrMo
Micro- and nano-scale tribo-corrosion of cast CoCrMo
Previous studies have established that some of the wear damage seen on cast CoCrMo joint surface is caused by entrained third-body hard particles. In this study, wet-cell micro-indentation and nano-scratch tests have been carried out with the direct aim of simulating wear damage induced by single abrasive particles entrained between the surfaces of cast CoCrMo hip implants. In situ electrochemical current noise measurements were uniquely performed to detect and study the wear-induced corrosion as well as the repassivation kinetics under the micro-/nano-scale tribological process. A mathematical model has been explored for the CoCrMo repassivation kinetics after surface oxide film rupture. Greater insights into the nature of the CoCrMo micro-/nano-scale wear-corrosion mechanisms and deformation processes are determined, including the identification of slip band formation, matrix/carbide deformation, nanocrystalline structure formation and strain-induced phase transformation. The electrochemical current noise provides evidence of instantaneous transient corrosion activity at the wearing surface resulting from partial oxide rupturing and stripping, concurrent with the indent/scratch.
biotribology, wear mechanisms
525-533
Sun, D.
ccee3ca1-d1bb-46a7-b0a9-438700125b89
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
24 January 2011
Sun, D.
ccee3ca1-d1bb-46a7-b0a9-438700125b89
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Sun, D., Wharton, J.A. and Wood, R.J.K.
(2011)
Micro- and nano-scale tribo-corrosion of cast CoCrMo.
Tribology Letters, 41 (3), .
(doi:10.1007/s11249-011-9757-y).
Abstract
Previous studies have established that some of the wear damage seen on cast CoCrMo joint surface is caused by entrained third-body hard particles. In this study, wet-cell micro-indentation and nano-scratch tests have been carried out with the direct aim of simulating wear damage induced by single abrasive particles entrained between the surfaces of cast CoCrMo hip implants. In situ electrochemical current noise measurements were uniquely performed to detect and study the wear-induced corrosion as well as the repassivation kinetics under the micro-/nano-scale tribological process. A mathematical model has been explored for the CoCrMo repassivation kinetics after surface oxide film rupture. Greater insights into the nature of the CoCrMo micro-/nano-scale wear-corrosion mechanisms and deformation processes are determined, including the identification of slip band formation, matrix/carbide deformation, nanocrystalline structure formation and strain-induced phase transformation. The electrochemical current noise provides evidence of instantaneous transient corrosion activity at the wearing surface resulting from partial oxide rupturing and stripping, concurrent with the indent/scratch.
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Published date: 24 January 2011
Keywords:
biotribology, wear mechanisms
Organisations:
Engineering Sciences
Identifiers
Local EPrints ID: 174635
URI: http://eprints.soton.ac.uk/id/eprint/174635
ISSN: 1023-8883
PURE UUID: c6133b66-fc56-45da-a705-fcfcdf741052
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Date deposited: 15 Feb 2011 13:41
Last modified: 14 Mar 2024 02:41
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Author:
D. Sun
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