Micro- and Nano-scale Tribo-Corrosion of Cast CoCrMo

D. Sun*, J. A. Wharton, R. J. K. Wood

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)525-533
Number of pages9
JournalTribology letters
Volume41
Issue number3
DOIs
Publication statusPublished - Mar 2011

Keywords

  • Biotribology
  • Wear mechanisms
  • BORATE BUFFER SOLUTION
  • HIP-JOINT BEARINGS
  • CURRENT TRANSIENTS
  • WEAR MECHANISMS
  • IN-VITRO
  • METAL
  • SURFACE
  • BIOTRIBOCORROSION
  • INDENTATION
  • PROSTHESES

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