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New insights into the fundamental chemical nature of ionic liquid film formation on magnesium alloy surfaces
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Forsyth, Maria, Neil, Wayne C., Howlett, Patrick C., 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, 1 (5). pp. 1045-1052. doi:10.1021/am900023j ISSN 1944-8244.
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Official URL: http://dx.doi.org/10.1021/am900023j
Abstract
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)(2)N- 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 him formation on the metal is not a simple chemical interaction between the components of the IL and the substrate but may involve electrochemical processes.
| Item Type: | Journal Article | ||||
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| Subjects: | T Technology T Technology > TA Engineering (General). Civil engineering (General) |
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| Journal or Publication Title: | ACS Applied Materials & Interfaces | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 1944-8244 | ||||
| Official Date: | May 2009 | ||||
| Dates: |
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| Volume: | 1 | ||||
| Number: | 5 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 1045-1052 | ||||
| DOI: | 10.1021/am900023j | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Australian Research Council (ARC), Australian Centre For Electromaterials Science, Australian Postgraduate Award |
Data sourced from Thomson Reuters' Web of Knowledge
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