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Control of biodegradation of a Mg alloy in simulated body fluid

conference contribution
posted on 01.01.2011, 00:00 authored by Yafei Zhang, Maria ForsythMaria Forsyth, Bruce HintonBruce Hinton, G Wallace
Mg alloy AZ31 is an attractive candidate for coronary artery stents, as it possesses excellent biocompatibility in human body and good mechanical properties. However, AZ31 magnesium alloys generally have poor corrosion resistance in the body environment. This paper reports on the early stages of an investigation into the corrosion mechanism and the morphology of corrosion of AZ31 in simulated body fluid (SBF). The investigation will also consider ways of improving corrosion resistance of this alloy in SBF through the use of ionic liquids. The results to date have shown that AZ31 suffers severe localized pitting corrosion in SBF. The pits mainly develop adjacent to the Al-Mn intermetallic second phase in the α matrix. Energy Dispersive X-Ray Spectroscopy results revealed the presence of Mg, O, Ca, and P in the layer of corrosion product. Treatment of the AZ31 alloy prior to corrosion testing in SBF with the ionic liquid trimethyl (butyl) phosphonium diphenyl phosphate (P1444DPP) produced some increase in the corrosion resistance of the alloy.

History

Event

International Corrosion. Congress (18th : 2011 : Perth, W. A.)

Pagination

1 - 8

Publisher

International Corrosion Council

Location

Perth, W. A.

Place of publication

[Perth, W. A.]

Start date

20/11/2011

End date

24/11/2011

Language

eng

Publication classification

E1 Full written paper - refereed

Copyright notice

2011, The Authors

Title of proceedings

ICC 2011 : 18th International Corrosion Congress : Corrosion Control, Contributing to a Sustainable Future for All