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dc.contributor.authorBontrager, Jordan
dc.contributor.authorMahapatro, Anil
dc.contributor.authorGomes, Anosh
dc.identifier.citationBONTRAGER, J., MAHAPATRO, A. and GOMES, A.S. (2014), Microscopic bio-corrosion evaluations of magnesium surfaces in static and dynamic conditions. Journal of Microscopy, vol. 255:no. 2:pp 104–115. doi: 10.1111/jmi.12142en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractBiodegradable materials including biodegradable metals are continuously being investigated for the development of next generation cardiovascular stents. Predictive in vitro tests are needed that could evaluate potential materials while simulating in vivo conditions. In this manuscript we report the microscopic bio-corrosion evaluations of magnesium surfaces in static and dynamic conditions. A corrosion test bench was designed and fabricated and static and dynamic corrosion tests were carried out with samples of magnesium alloy. The fluid wall shear stress equation and the Churchill's friction factor equation were used to calculate the fluid velocity required to generate the desired shear stress on samples in the test bench. Static and dynamic corrosion tests at 24 and 72 h were carried out at 0.88 Pa shear stress mimicking the in vivo shear stress. Microscopic evaluations of the corroded surfaces were carried out by optical, scanning electron microscopy and energy dispersive X-ray spectroscopy to evaluate the corrosion behaviour and surface properties of the test samples. The surface and interface analysis of magnesium samples post test indicated that dynamic conditions prevented the build-up of corrosion by-products on the sample surface and the corrosion mechanism was uniform as compared to static conditions. The use of a masking element to restrict the exposed area of the sample didn't result in increased corrosion at the boundary. Thus, we have demonstrated the feasibility of the designed test bench as a viable method for bio-corrosion surface analysis under dynamic corrosion conditions for potential biodegradable cardiovascular stent materials.en_US
dc.description.sponsorshipWSU COE for financial support of Jordan Bontrager.en_US
dc.publisherJohn Wiley & Sons, Inc.en_US
dc.relation.ispartofseriesJournal of Microscopy;v.255:no.2
dc.subjectMicroscopic characterizationen_US
dc.subjectSEM and dynamic in vitro testingen_US
dc.titleMicroscopic bio-corrosion evaluations of magnesium surfaces in static and dynamic conditionsen_US
dc.rights.holder© 2014 The Authors Journal of Microscopy © 2014 Royal Microscopical Society

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