화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.165, No.2, E70-E75, 2018
Fundamental Aspects of Uranium Electropolishing in AlCl3-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid
A smooth and flat uranium surface with trace of well-defined grain boundaries has been obtained by electropolishing in the Lewis acidic AlCl3-1-ethyl-3-methylimidazolium chloride ionic liquid. The surface roughness Ra and Ry of the uranium reduced substantially from 130.1 nm and 899.4 nm to 16.77 nm and 206.89 nm after electropolishing, respectively. The underlying mechanism of electropolishing has been investigated by the combination of electrochemical, spectroscopic and surface characterization methods. A current density plateau in the measured polarization curves of uranium is observed, which is directly related to the mass transport limit of U3+. The mass transport mechanism of the process follows the salt precipitation model, and the precipitate is proposed to be in the form of U(Al2Cl7) (x)(AlCl4)(3-x). (C) The Author(s) 2018. Published by ECS.