Control of biodegradation of a Mg alloy in simulated body fluid

Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon Wallace

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

7 Citations (Scopus)

Abstract

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 (P 1444DPP) produced some increase in the corrosion resistance of the alloy.

Original languageEnglish
Title of host publication18th International Corrosion Congress 2011
Subtitle of host publication20-24 November 2011; Perth, Australia
Place of PublicationBlackburn VIC Australia
PublisherAustralasian Corrosion Association
Pages1813-1820
Number of pages8
Volume3
ISBN (Print)9781618393630
Publication statusPublished - 2011
EventInternational Corrosion Congress 2011 - Perth Convention and Exhibition Centre, Perth, Australia
Duration: 20 Nov 201124 Nov 2011
Conference number: 18th

Conference

ConferenceInternational Corrosion Congress 2011
Abbreviated titleICC 2011
CountryAustralia
CityPerth
Period20/11/1124/11/11
OtherThe 18th International Corrosion Congress took place between the 20th and the 24th November 2011 in the Perth Convention and Exhibition Centre, Australia. The International Corrosion Congress is the major event of the International Corrosion Council (ICC), an international body founded to advance corrosion science and engineering and is held once every three years by different host countries.

Keywords

  • Biodegradable coronary artery stents
  • Ionic liquids
  • Magnesium alloys
  • Pitting corrosion
  • Simulated body fluid

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