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In vitro studying corrosion behaviour of biocorrodible Mg alloys
conference contribution
posted on 2012-01-01, 00:00 authored by S Jamalia, S Moulton, Maria ForsythMaria Forsyth, G WallaceThe idea of bioabsorbable/biocorrodible stents has gained increasing attention in the last decade. Permanent coronary stents, traditionally made from 316L grade stainless steel, are routinely used for the treatment of blocked arteries. However, these stents can cause complications such as restenosis, thrombosis and the need for the patient to undergo prolonged antiplatelet therapy. Biodegradable metal stents provide an opportunity for the stent to remain in place for a period to ensure restoration of function and then degrade through a carefully controlled bio-corrosion process. Among the number of potentially suitable materials, Magnesium alloys have shown great promise as a stent material due to their non-toxicity [1] and the corrosion rates attainable in biological environments. However, a carefully controlled corrosion process is essential in order to avoid hyper hydrogen generation and the fatal consequences that follow. In addition uniform corrosion is a basic requirement to maintain the mechanical integrity and load bearing characteristics. Work being undertaken in our laboratories focuses on controlling the corrosion behaviour of magnesium in a simulated biological environment in the presence of protein. In the investigation reported here the Mg alloy has been examined using Scanning Electrochemical Microscope (SECM) to visualize the corrosion process and identify the corrosion pattern. Complementary bulk electrochemical techniques (EIS and potentiodynamic polarization) have been used to acquire kinetic and mechanistic information. Early results obtained by SECM have revealed the tendency towards pitting corrosion in the early stages which subsequently develops in to filiform corrosion.
History
Event
Australasian Corrosion Association. Conference (2012 : Melbourne, Victoria)Pagination
1 - 11Publisher
Australasian Corrosion AssociationLocation
Melbourne, VictoriaPlace of publication
[Melbourne, Vic.]Start date
2012-11-11End date
2012-11-14ISBN-13
9781622769698Language
engPublication classification
E1 Full written paper - refereedTitle of proceedings
ACA Corrosion & Prevention 2012 : Proceedings of the Annual Australasian Corrosion Association ConferenceUsage metrics
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