Journal
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
Volume 4, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2051-672X/4/3/034002
Keywords
fretting corrosion; impedance; titanium alloys; voltage transients; orthopedic implants; tribocorrosion
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Funding
- Depuy Synthes
- Medtronic, Inc.
- Stryker Orthopedics
- Cheney International Faculty Fellowship at the University of Leeds
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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.
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