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. and Forsyth, M. 2012, On corrosion behaviour of magnesium alloy AZ31 in simulated body fluids and influence of ionic liquid pretreatments, Corrosion engineering, science and technology, vol. 47, no. 5, pp. 374-382, doi: 10.1179/1743278212Y.0000000032.

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Title On corrosion behaviour of magnesium alloy AZ31 in simulated body fluids and influence of ionic liquid pretreatments
Author(s) Zhang, Y.F.
Hinton, B.ORCID iD for Hinton, B. orcid.org/0000-0002-0894-1388
Wallace, G.
Liu, X.
Forsyth, M.ORCID iD for Forsyth, M. orcid.org/0000-0002-4273-8105
Journal name Corrosion engineering, science and technology
Volume number 47
Issue number 5
Start page 374
End page 382
Total pages 9
Publisher Maney Publishing
Place of publication London, England
Publication date 2012-08
ISSN 1478-422X
Keyword(s) coronary artery stents
electrochemical impedance spectroscopy
flowing cell
ionic liquids
Mg alloy AZ31
simulated body fluid
Summary 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 P1444DPP and trihexyl(tetradecyl)-phosphonium bis-2,4,4trimethylpentyl-phosphinate [P66614][ i(C8) 2PO2] 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 [P66614][i(C8)2PO2] 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 [P66614][i(C8)2PO2] 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. © 2012 Institute of Materials, Minerals and Mining.
Language eng
DOI 10.1179/1743278212Y.0000000032
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30051142

Document type: Journal Article
Collections: Institute for Frontier Materials
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