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On the biodegradation performance of an Mg–Y–RE alloy with various surface conditions in simulated body fluid

Paper ID Volume ID Publish Year Pages File Format Full-Text
2356 109 2009 10 PDF Available
Title
On the biodegradation performance of an Mg–Y–RE alloy with various surface conditions in simulated body fluid
Abstract

This study documents the influence of different surface conditions produced by various heat treatments on the in vitro degradation performance of an Mg–Y–RE alloy (WE43) investigated by immersion in simulated body fluid. WE43 samples were, respectively (i) annealed at 525 °C (plus artificial aging at 250 °C in one case) and afterwards polished; and (ii) polished, annealed at 500 °C in air and subsequently investigated in the oxidized state. Thermogravimetric analysis (TGA) indicates a mass gain during oxidation in air, following a square-root law over time. X-ray diffraction spectra imply a growing Y2O3 layer upon oxidation, and Auger electron spectroscopy depth profiles show an increased oxide layer thickness which develops according to the behavior observed by TGA. Macroscopically, the degradation performance of the differently heat-treated samples can be divided into two groups. Annealed and polished samples show a fast and homogeneous degradation which slows with time. Their degradation behavior is approximated by a parabolic law. Oxidized samples exhibit a slow initial degradation rate which increases when the protection of the oxide layer is reduced. Overall, they reveal a sigmoidal degradation behavior. Here the differing degradation performances of the annealed–polished and the oxidized samples are related to the different surface conditions and explained on the basis of a depletion hypothesis.

Keywords
Magnesium biodegradation; Simulated body fluid; Surface conditions; Oxide layer; Yttrium depletion
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On the biodegradation performance of an Mg–Y–RE alloy with various surface conditions in simulated body fluid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 5, Issue 1, January 2009, Pages 162–171
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