Magnesium (Mg) alloys have numerous characteristics such as low cost, high melting point, lowequivalent weight, high electrochemical reactivity for battery applications, biodegradability,abundance, which make them attractive material in many applications. For different applications,the reactivity of Mg alloys was extensively studied in aqueous solutions of inorganic salts and inpure ionic liquids (IL) (see for instance [1, 2]). The activity domain being very different betweenwater and ionic liquids, it is of interest to study how the material behavior will be influenced by themodification of the electrolyte in the intermediate cases when water and IL are both present incomparable concentrations. There is however, a lack of knowledge about the electrochemicalreactivity of Mg alloys and the nature of the surface films formed in such systems.This work will present the results of potentiodynamic polarization tests of commerciallyavailable Mg alloys carried out in aqueous solutions of ILs with various concentrations. The effectof the IL concentration on the nature and quantity of the surface oxides, hydroxides and organiclayers will be verified by confocal Raman spectroscopy, infrared spectroscopy, Glow dischargeoptical emission spectroscopy (GD-OES) and X-ray photoelectron spectroscopy.
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