Area-dependent impedance-based voltage shifts during tribocorrosion of Ti-6Al-4V biomaterials: theory and experiment. (24th June 2016)

• Record Type: Journal Article
• Authors: Gilbert, Jeremy L; Mali, Sachin A; Liu, Yangping
• Is Part Of: Surface topography. Volume 4:Number 3(2016:Jul./Sep.)
• Publication Date: 2016-06-24
• Subjects: fretting corrosion -- impedance -- titanium alloys -- voltage transients -- orthopedic implants -- tribocorrosion; Surfaces (Physics) -- Periodicals; Surfaces (Physics) -- Measurement -- Periodicals; 530.417
• DOI: 10.1088/2051-672X/4/3/034002
• Languages: English
• ISSNs: 2051-672X

Abstract

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.