The mechanism of deposition of calcium phosphate coatings from solution onto magnesium alloy AZ31

In recent years, magnesium alloys have been proposed as a new class of metallic bioabsorbable implant material. Unfortunately, hydrogen gas evolution and an increase in alkalinity are both byproducts of the degradation process. This necessitates the development of magnesium alloys with controlled de...

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Bibliographic Details
Published in:Journal of biomedical materials research. Part A 2009-08, Vol.90A (2), p.339-350
Main Authors: Gray-Munro, J. E., Strong, M.
Format: Article
Language:English
Subjects:
Alloys - chemistry
Biocompatible Materials
Calcium - chemistry
calcium phosphate coating
Calcium Phosphates - chemistry
Chromatography, High Pressure Liquid
Coated Materials, Biocompatible - chemistry
Crystallization
Durapatite - chemistry
Humans
hydroxyapatite
Ions
magnesium
Magnesium - chemistry
Models, Chemical
Polymers - chemistry
Spectrophotometry, Atomic - methods
surface analysis
Surface Properties
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Summary:In recent years, magnesium alloys have been proposed as a new class of metallic bioabsorbable implant material. Unfortunately, hydrogen gas evolution and an increase in alkalinity are both byproducts of the degradation process. This necessitates the development of magnesium alloys with controlled degradation rates. The development of biocompatible coatings that can delay the onset of corrosion is essential for improving the lifetime and performance of these materials in vivo. Calcium phosphate coatings have been shown to improve the biocompatibility of metallic implants for orthopedic applications. In this article, we report a solution chemistry technique for depositing calcium phosphate coatings on magnesium alloy surfaces. Our kinetic studies indicate that the deposition of the coating is related to the anodic dissolution of the substrate. Characterization of the coating by XPS, SEM/EDS, and XRD reveal that the coating produced is a poorly crystalline calcium magnesium hydroxyapatite material. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009
ISSN:1549-3296
1552-4965
DOI:10.1002/jbm.a.32107