Corrosion of mg alloy ZE41 and its mitigation using ionic liquids

Neil, W., Forsyth, M. and Hinton, B.R.W. 2010, Corrosion of mg alloy ZE41 and its mitigation using ionic liquids, in ACA 2010 : Corrosion and Prevention : Proceedings of the 2010 Australasian Corrosion Association Conference, Australasian Corrosion Association, Melbourne, Vic., pp. 431-445.

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Title Corrosion of mg alloy ZE41 and its mitigation using ionic liquids
Author(s) Neil, W.
Forsyth, M.ORCID iD for Forsyth, M.
Hinton, B.R.W.ORCID iD for Hinton, B.R.W.
Conference name Australasian Corrosion Association. Conference (50th :2010 : Adelaide, South Australia)
Conference location Adelaide, South Australia
Conference dates 14-17 Nov. 2010
Title of proceedings ACA 2010 : Corrosion and Prevention : Proceedings of the 2010 Australasian Corrosion Association Conference
Editor(s) [Unknown]
Publication date 2010
Conference series Australasian Corrosion Association Conference
Start page 431
End page 445
Total pages 15
Publisher Australasian Corrosion Association
Place of publication Melbourne, Vic.
Keyword(s) Corrosion protection
Ionic liquids
Magnesium alloy
Pitting corrosion
Summary Magnesium alloy ZE41 (Mg-Zn-RE-Zr), which is used extensively in the aerospace industry, possesses excellent mechanical properties albeit poor corrosion resistance. This work investigates the mechanism of corrosion, and the interaction between the grain boundary intermetallic phases, the zirconium (Zr)-rich regions within the grains and the bulk Mg rich matrix in both the as-cast and heat-treated conditions. The results of optical and scanning electron microscopy (SEM) show the importance of the microstructure in the initiation and propagation of corrosion in an aqueous environment. The Zr-rich regions play a distinct role in the early stages of corrosion with this alloy. The second part of this work investigates the interaction of two different ionic liquids (ILs) with the surface of the ZE41 alloy. ILs based on trihexyltetradecylphosphonium (P 6,6,6,14) coupled with either diphenylphosphate (DPP) or bis(trifluoromethanesulfonyl) amide (Tf 2N) have been shown to react with Mg alloy surfaces, leading to the formation of a surface film that can improve the corrosion resistance of the alloy. The interaction of the ILs with the ZE41 surface has been investigated by optical microscopy and SEM. Surface characterization has been performed using Time of Flight-Secondary Ion Mass Spectrometry (ToF-SIMS) and X-ray Photoelectron Spectroscopy (XPS). The surface characterization and microscopy revealed the preferential interaction with the grain boundaries and grain boundary phases. Thus the morphology and microstructure of the Mg surface seems critical in determining the nature of the interaction with the IL. The corrosion protection of the IL films formed on the ZE41 surface was investigated by SEM and potentiodynamic polarisation.
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ISBN 9781617824791
Language eng
Field of Research 109999 Technology not elsewhere classified
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category E1.1 Full written paper - refereed
Copyright notice ©2010, Australasian Corrosion Association
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