Potentiostatic control of ionic liquid surface film formation on ZE41 magnesium alloy

Efthimiadis, Jim, Neil, Wayne C., Bunter, Andrew, Howlett, Patrick C., Hinton, Bruce R. W., MacFarlane, Douglas R. and Forsyth, Maria 2010, Potentiostatic control of ionic liquid surface film formation on ZE41 magnesium alloy, ACS applied materials & interfaces, vol. 2, no. 5, pp. 1317-1323.

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Title Potentiostatic control of ionic liquid surface film formation on ZE41 magnesium alloy
Author(s) Efthimiadis, Jim
Neil, Wayne C.
Bunter, Andrew
Howlett, Patrick C.
Hinton, Bruce R. W.
MacFarlane, Douglas R.
Forsyth, Maria
Journal name ACS applied materials & interfaces
Volume number 2
Issue number 5
Start page 1317
End page 1323
Total pages 7
Publisher American Chemical Society
Place of publication Washington D.C.
Publication date 2010-05
ISSN 1944-8244
1944-8252
Keyword(s) ionic liquids
trihexyl(tetradecyl)phosphonium
diphenylphosphate
magnesium alloy, ZE41
impedance spectroscopy
surface film
corrosion
Summary The generation of potentially corrosion-resistant films on light metal alloys of magnesium have been investigated. Magnesium alloy, ZE41 [Mg−Zn−Rare Earth (RE)-Zr, nominal composition 4 wt % Zn, 1.7 wt % RE (Ce), 0.6 wt % Zr, remaining balance, Mg], was exposed under potentiostatic control to the ionic liquid trihexyl(tetradecyl)phosphonium diphenylphosphate, denoted [P6,6,6,14][DPP]. During exposure to this IL, a bias potential, shifted from open circuit, was applied to the ZE41 surface. Electrochemical impedance spectroscopy (EIS) and chronoamperometry (CA) were used to monitor the evolution of film formation on the metal surface during exposure. The EIS data indicate that, of the four bias potentials examined, applying a potential of −200 mV versus OCP during the exposure period resulted in surface films of greatest resistance. Both EIS measurements and scanning electron microscopy (SEM) imaging indicate that these surfaces are substantially different to those formed without potential bias. Time of flight-secondary ion mass spectrometry (ToF-SIMS) elemental mapping of the films was utilized to ascertain the distribution of the ionic liquid cationic and anionic species relative to the microstructural surface features of ZE41 and indicated a more uniform distribution compared with the surface following exposure in the absence of a bias potential. Immersion of the treated ZE41 specimens in a chloride contaminated salt solution clearly indicated that the ionic liquid generated surface films offered significant protection against pitting corrosion, although the intermetallics were still insufficiently protected by the IL and hence favored intergranular corrosion processes.
Language eng
Field of Research 091207 Metals and Alloy Materials
030399 Macromolecular and Materials Chemistry not elsewhere classified
Socio Economic Objective 850602 Energy Storage (excl. Hydrogen)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30031053

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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