New insights into the fundamental chemical nature of ionic liquid film formation on magnesium alloy surfaces

Forsyth, Maria, Neil, Wayne C., Howlett, Patrick S., Macfarlane, Douglas R., Hinton, Bruce R. W., Rocher, Nathalie, Kemp, Thomas F. and Smith, Mark E. 2009, New insights into the fundamental chemical nature of ionic liquid film formation on magnesium alloy surfaces, ACS applied materials & interfaces, vol. 1, no. 5, pp. 1045-1052, doi: 10.1021/am900023j.

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Title New insights into the fundamental chemical nature of ionic liquid film formation on magnesium alloy surfaces
Author(s) Forsyth, MariaORCID iD for Forsyth, Maria
Neil, Wayne C.
Howlett, Patrick S.ORCID iD for Howlett, Patrick S.
Macfarlane, Douglas R.
Hinton, Bruce R. W.ORCID iD for Hinton, Bruce R. W.
Rocher, Nathalie
Kemp, Thomas F.
Smith, Mark E.
Journal name ACS applied materials & interfaces
Volume number 1
Issue number 5
Start page 1045
End page 1052
Total pages 8
Publisher American Chemical Society
Place of publication Washington D.C.
Publication date 2009-04-14
ISSN 1944-8244
Keyword(s) magnesium alloy
ionic liquids
surface film
Summary Ionic liquids (ILs) based on trihexyltetradecylphosphonium coupled with either diphenylphosphate or bis(trifluoromethanesulfonyl)amide have been shown to react with magnesium alloy surfaces, leading to the formation a surface film that can improve the corrosion resistance of the alloy. The morphology and microstructure of the magnesium surface seems critical in determining the nature of the interphase, with grain boundary phases and intermetallics within the grain, rich in zirconium and zinc, showing almost no interaction with the IL and thereby resulting in a heterogeneous surface film. This has been explained, on the basis of solid-state NMR evidence, as being due to the extremely low reactivity of the native oxide films on the intermetallics (ZrO2 and ZnO) with the IL as compared with the magnesium-rich matrix where a magnesium hydroxide and/or carbonate inorganic surface is likely. Solid-state NMR characterization of the ZE41 alloy surface treated with the IL based on (Tf)2N− indicates that this anion reacts to form a metal fluoride rich surface in addition to an organic component. The diphenylphosphate anion also seems to undergo an additional chemical process on the metal surface, indicating that film formation on the metal is not a simple chemical interaction between the components of the IL and the substrate but may involve electrochemical processes.
Language eng
DOI 10.1021/am900023j
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, American Chemical Society
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