On corrosion behaviour of magnesium alloy AZ31 in simulated body fluids and influence of ionic liquid pretreatments

Y. F. Zhang, B. Hinton, G. Wallace, X. Liu, M. Forsyth

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This paper reports on the corrosion of Mg alloy AZ31 in simulated body fluid (SBF) using static immersion tests and electrochemical impedance spectroscopy. A preliminary study on the effect of flowing SBF on the corrosion behaviour of AZ31 has also been carried out. Low toxicity ionic liquids (ILs) trimethyl(butyl)phosphonium diphenyl phosphate P 1444DPP and trihexyl(tetradecyl)-phosphonium bis-2,4,4trimethylpentyl-phosphinate [P 66614][ i(C 8) 2PO 2] have been used to provide corrosion protection for AZ31 in SBF. Time dependent immersion tests indicate that under static conditions, AZ31 suffers severe localised corrosion in SBF, with pits developing predominantly beside the Al-Mn intermetallic phase in the α matrix. At longer immersion times, the corrosion product eventually precipitates and covers the entire specimen surface. When exposed to SBF under flowing conditions with a shear stress of 0·88 Pa, more uniform corrosion was observed. The optical profilometry results and electrochemical impedance spectroscopy analysis suggest that both P 1444DPP and [P 66614][ i(C 8) 2PO 2] pretreatments can increase the corrosion resistance of AZ31 in SBF, in particular by decreasing the number of deeper pits found on the alloy surface. Cytotoxic test shows that the presence of the ILs P 1444DPP and [P 66614][ i(C 8) 2PO 2] in cell culture media slightly inhibits the growth of human coronary artery endothelial cells in comparison with the good cell viability around the treated specimen. A pretreatment with IL is used in order to improve the corrosion resistance of this alloy in SBF. 

Original languageEnglish
Pages (from-to)374-382
Number of pages9
JournalCorrosion Engineering Science and Technology
Volume47
Issue number5
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Keywords

  • Coronary artery stents
  • Electrochemical impedance spectroscopy
  • Flowing cell
  • Ionic liquids
  • Mg alloy AZ31
  • Simulated body fluid

Cite this

Zhang, Y. F. ; Hinton, B. ; Wallace, G. ; Liu, X. ; Forsyth, M. / On corrosion behaviour of magnesium alloy AZ31 in simulated body fluids and influence of ionic liquid pretreatments. In: Corrosion Engineering Science and Technology. 2012 ; Vol. 47, No. 5. pp. 374-382.
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On corrosion behaviour of magnesium alloy AZ31 in simulated body fluids and influence of ionic liquid pretreatments. / Zhang, Y. F.; Hinton, B.; Wallace, G.; Liu, X.; Forsyth, M.

In: Corrosion Engineering Science and Technology, Vol. 47, No. 5, 08.2012, p. 374-382.

Research output: Contribution to journalArticleResearchpeer-review

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KW - Electrochemical impedance spectroscopy

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KW - Ionic liquids

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KW - Simulated body fluid

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