Correlation between the formation of tribofilm and repassivation in biomedical titanium alloys during tribocorrosion

Yidong Xu, Jiahui Qi, John Nutter, Joanne Sharp, Mingwen Bai, Le Ma, W.M. Rainforth

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Titanium alloys are widely used in the field of orthopaedics, however, poor tribological performance arising from the low shear resistance and weak protection of the oxide layer limits their applicability. In this work, the tribocorrosion behaviour of novel β and α + β biomedical titanium alloys were studied in bovine serum solution under open circuit potential. Ti-5Mo-Fe-3Sn and Ti-6Al-4V ELI alloys were found to have the capability to repassivate when testing at a slower sliding speed. Scanning and transmission electron microscopy results revealed that the repassivation was mainly associated with the greater tribofilm formation on the worn surface, rather than an oxide film. The tribolayer performed as a solid lubricating film, which stabilised the coefficient of friction.
Original languageEnglish
Article number107147
JournalTribology International
Volume163
Early online date24 Jun 2021
DOIs
Publication statusPublished - Nov 2021

Funder

This work was supported by the Henry Royce Institute for Advanced Materials under EPSRC Grant EP/R00661X/1 and also the EPSRC Programme Grant, Friction: The Tribology Enigma, EP/R001766/1 .

Keywords

  • Titanium alloys
  • Tribocorrosion
  • Repassivation
  • Tribofilm
  • Electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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