Title: Effect of surface orientation on dissolution rate and surface dynamics of UO2 single crystals in nitric acid
Authors: BERTOLOTTO SOLÈNESZENKNECT STÉPHANIELALLEMAN SOPHIEMAGNALDO ALASTAIRRAISON PHILIPPEODORICO MICHAELPODOR RENAUDCLAPAREDE LAURENTDACHEUX NICOLAS
Citation: CORROSION SCIENCE vol. 176 p. 109020
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2020
JRC N°: JRC122186
ISSN: 0010-938X (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC122186
DOI: 10.1016/j.corsci.2020.109020
Type: Articles in periodicals and books
Abstract: UO2 single crystals with (100), (110) and (111) oriented faces were dissolved in 2 mol.L-1 HNO3 at room temperature. The evolution of the topography of the surface was monitored and reliable dissolution rates corresponding to the three crystallographic orientations were determined under controlled hydrodynamic and chemical conditions. The dissolution tests of UO2 polished single crystals showed two different kinetic steps. During the first uncatalysed kinetic regime, the enhanced reactivity of the surface at defect sites was demonstrated. The second kinetic step was attributed to a catalysed dissolution mechanism involving species produced at the solid/solution interface during the first step.
JRC Directorate:Nuclear Safety and Security

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