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Anodic dissolution of cobalt in aqueous sodium nitrate solution at high current densities

: Schneider, Michael; Schubert, Nora; Höhn, Sören; Michaelis, Alexander


Materials and corrosion 66 (2015), Nr.6, S.549-556
ISSN: 0947-5117
Fraunhofer IKTS ()
anodic cobalt dissolution; electrochemical machining; in-operando microscopy; surface texture

The present work focuses on the anodic dissolution of cobalt and the surface texture development in 2.9 mol/L sodium nitrate solution under current controlled conditions at 25 and 30 A/cm2. Before the electrochemical experiments the crystallographic orientation of the samples was investigated by EBSD. The anodic behavior of cobalt as well as the surface topography was microscopically observed using a special electrochemical through flow cell in-operando during the current controlled dissolution. The experiments were completed by SEM/EDX-analysis. The authors evidence that the dissolution process at high current densities is independent of the crystallographic orientation of the sample and leads to a surface polishing. The current efficiency is approximately 100%. Only a weak and temporary oxygen evolution was detected at 25 A/cm2.