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An Electrochemical Impedance Study of Ionic Liquid Film Formation and Aqueous Corrosion of Magnesium Alloy ZE41
Author(s) -
Howlett Patrick C.,
Neil Wayne,
Khoo Timothy,
Sun Jiazeng,
Forsyth Maria,
MacFarlane Douglas R.
Publication year - 2008
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.48.3-4.313
Subject(s) - corrosion , ionic liquid , chemistry , phosphonium , dielectric spectroscopy , aqueous solution , magnesium , magnesium alloy , alloy , electrochemistry , chemical engineering , metallurgy , inorganic chemistry , materials science , electrode , polymer chemistry , organic chemistry , engineering , catalysis
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 (P 66614 DPP). 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.