Area-dependent impedance-based voltage shifts during tribocorrosion of Ti-6Al-4V biomaterials: Theory and experiment

Jeremy L. Gilbert, Sachin A. Mali, Yangping Liu

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Tribocorrosion of medical devices causes the electrode potential across the device-solution interface to become more negative. This study provides a theoretical impedance-based understanding of voltage versus time changes that arise. It combines tribocorrosion with the voltage-dependent impedance characteristics of the surface, the relative anodic and cathodic areas and the mechanics and electrochemistry of oxide abrasion. An area-dependent Randle's circuit is used with the tribocorrosion current equation to show the time-dependent voltage change with disruption and repassivation of the oxide. Heredity integrals are used to predict voltage over time for any arbitrary current-time path. Experiments using titanium pin-on-disk fretting corrosion are used to assess the theoretical model and to demonstrate its behavior.

Original languageEnglish (US)
Article number034002
JournalSurface Topography: Metrology and Properties
Volume4
Issue number3
DOIs
StatePublished - Sep 1 2016

Keywords

  • Fretting corrosion
  • Impedance
  • Orthopedic implants
  • Titanium alloys
  • Tribocorrosion
  • Voltage transients

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films

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