Abstract
Magnesium anodization was examined in room temperature :EMIC and :DMPIC ionic liquids, where EMIC = 1‐ethyl‐3‐methylimidazolium chloride and DMPIC = 1,2‐dimethyl‐3‐propylimidazolium chloride. For all melts, the :organic chloride mole ratio was <1, yielding chloride‐rich (i.e., basic) compositions. The rate of magnesium anodization was limited by diffusion of chloride ions to the electrode surface. From the Cottrell slopes for magnesium anodization at a Mg disk electrode and for chloride oxidation at a Pt disk electrode, the chloride stoichiometry of the anodization process in :EMIC was determined to be 4.1 (± 0.5), corresponding to the formation of soluble . Similar chloride stoichiometry was found in :DMPIC. buffers the melt to approximate neutrality from the basic side, dissolving as . Magnesium metal was chemically stable in basic :DMPIC, but it reacted completely and irreversibly with basic :EMIC to produce colored organic byproducts. Some comments are made on the acidity of and in the basic melts.
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