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The influence of niobium and vanadium on passivity of titanium-based implants in physiological solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
12773 816 2003 11 PDF Available
Title
The influence of niobium and vanadium on passivity of titanium-based implants in physiological solution
Abstract

Surface films play a key role in corrosion and osteointegration processes of titanium-based orthopedic implants. The influence of niobium and vanadium as alloying elements on titanium alloy passivity have been investigated in Hanks’ Balanced Salt Solution (HBSS), at 37°C and pH 6.9.Ti6Al4V and Ti6Al6Nb have been considered. The excellent passivating properties of the anodically formed Ti(IV)-based surface oxide film and high corrosion resistance of the Ti6Al6Nb alloy have been attributed to the stabilizing effect of Nb5+ cations on the passive film, by annihilation of stoichiometric defects (anion vacancies) caused by the presence of titanium suboxides. Localized corrosion sensitivity of the Ti6Al4V alloy has been correlated to the dissolution of vanadium at the surface film/electrolyte interface coupled with generation of cation vacancies and their diffusion through the film as a part of the solid-state diffusion process. The presence of a high concentration of chloride ions (0.15 g l−1) in HBSS further accelerates these processes.

Keywords
Orthopedic implants; Titanium–vanadium alloys; Titanium–niobium alloys; Corrosion; Passivity; Stoichiometric defects
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 24, Issue 21, September 2003, Pages 3765–3775
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us