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Chemical surface alteration of biodegradable magnesium exposed to corrosion media

Paper ID Volume ID Publish Year Pages File Format Full-Text
1380 82 2011 12 PDF Available
Title
Chemical surface alteration of biodegradable magnesium exposed to corrosion media
Abstract

The understanding of corrosion processes of metal implants in the human body is a key problem in modern biomaterial science. Because of the complicated and adjustable in vivo environment, in vitro experiments require the analysis of various physiological corrosion media to elucidate the underlying mechanism of “biological” metal surface modification. In this paper magnesium samples were incubated under cell culture conditions (i.e. including CO2) in electrolyte solutions and cell growth media, with and without proteins. Chemical mapping by high-resolution electron-induced X-ray emission spectroscopy and infrared reflection microspectroscopy revealed a complex structure of the formed corrosion layer. The presence of CO2 in concentrations close to that in blood is significant for the chemistry of the oxidised layer. The presence of proteins leads to a less dense but thicker passivation layer which is still ion and water permeable, as osmolality and weight measurements indicate.

Keywords
Magnesium; Physiological corrosion; Chemical element mapping; IR reflection microspectroscopy; Corrosion layer
First Page Preview
Chemical surface alteration of biodegradable magnesium exposed to corrosion media
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 7, Issue 6, June 2011, Pages 2704–2715
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering