Abstract
Anodic dissolution of titanium was investigated in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethyl-sulfonyl)amide (BMPTFSA) in the presence of halide ions, Cl– and Br–. Electropolishing of Ti was possible in the presence of Cl– at 353 K, suggesting that the surface of a Ti electrode with the native oxide layer was activated by Cl–. The dissolved species of Ti after anodic dissolution of Ti at 0 V vs. Ag|Ag(I) was found to be tetravalent [TiCl6]2–, because the applied potential was more positive than the redox potential of [TiCl6]2–/[TiCl6]3–. The morphology of a Ti electrode changed after potentiostatic anodic oxidation at –0.5 V in BMPTFSA containing BMPBr, indicating that anodic dissolution of Ti was possible in the presence of Br–.
Published Version
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