precipitation of struvite on pure magnesium and in vitro degradation behaviour

Walter, Rhys, Mehjabeen, Afrin, Gordon, Timothy, and Kannan, M. Bobby (2013) precipitation of struvite on pure magnesium and in vitro degradation behaviour. In: Proceedings of the CHEMECA 2013. 30562. From: CHEMECA 2013, 29 September - 2 October 2013, Brisbane, QLD, Australia.

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Magnesium is a prime candidate for use as a biodegradable biomaterial for bone fracture repair. However, the degradation rate of magnesium under physiological conditions is too high to maintain mechanical integrity until complete bone healing, and as such requires a biocompatible coating to reduce the degradation rate. One method to achieve this is by biomimetically depositing calcium phosphates onto the magnesium substrate. However, this method is slow and dissolution of the magnesium may occur during the process. In this study, struvite (magnesium ammonium phosphate) was coated on pure magnesium using the dip coating method as a precursor to a biomimetically formed calcium phosphate coating. The in vitro degradation behaviour of the coated magnesium was tested using electrochemical methods. Electrochemical impedance spectroscopy (EIS) results showed a significant improvement in the polarisation resistance (RP) for the struvite coated samples when compared to the bare metal. The RP of the coated samples increased slightly after 3 h immersion in simulated body fluid, due to the deposition of calcium phosphates onto the struvite, and remained relatively stable for the remaining immersion period. This method may be suitable as a pretreatment when biomimetically precipitating calcium phosphate onto magnesium.

Item ID: 30230
Item Type: Conference Item (Research - E1)
ISBN: 978-1-922107-07-7
Keywords: magnesium; biomaterials; corrosion; struvite
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Date Deposited: 18 Mar 2014 02:39
FoR Codes: 09 ENGINEERING > 0903 Biomedical Engineering > 090301 Biomaterials @ 100%
SEO Codes: 86 MANUFACTURING > 8612 Fabricated Metal Products > 861201 Coated Metal and Metal-Coated Products @ 100%
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