Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 5, Pages 1045-1052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am900023j
Keywords
magnesium alloy; ionic liquids; surface film; NMR; corrosion
Funding
- EPSRC
- Australian Research Council
- Australian Centre For Electromaterials Science
- Australian Postgraduate Award
- EPSRC [EP/F022913/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F022913/1] Funding Source: researchfish
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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.
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