An electrochemical impedance study of ionic liquid film formation and aqueous corrosion of magnesium alloy ZE41
Howlett, Patrick C., Neil, Wayne, Khoo, Timothy, Sun, Jiazeng, Forsyth, Maria and MacFarlane, Douglas R. 2008, An electrochemical impedance study of ionic liquid film formation and aqueous corrosion of magnesium alloy ZE41, Israel journal of chemistry, vol. 48, no. 3-4, pp. 313-318, doi: 10.1560/IJC.48.3-4.313.
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An electrochemical impedance study of ionic liquid film formation and aqueous corrosion of magnesium alloy ZE41
Ionic liquid surface treatments are proposed as a method of controlling corrosion processes on magnesium alloys. An important magnesium alloy, ZE41 (nominally 4% Zn and 1% rare earth), was treated with the ionic liquid trihexyl(tetradecyl)phosphonium diphenylphosphate (P66614DPP). Impedance spectra were acquired at intervals during the treatment, indicating the development of a film and allowing a measure of the film formation process to be obtained over time. Mechanically polished and electro-polished surfaces were prepared; these surfaces, treated and untreated, were subsequently exposed to 0.1 M NaCl aqueous solutions. The corrosion behavior of the prepared surfaces were assessed using impedance spectroscopy and optical microscopy. The results indicated a significant role for the method of surface preparation used and, in both cases, the ionic liquid treatment produced a more corrosion-resistant surface.
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