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Anodic dissolution behaviour and surface texture development of cobalt under electrochemical machining conditions

: Schneider, M.; Schubert, N.; Höhn, S.; Michaelis, A.


Electrochimica Acta 106 (2013), S.279-287
ISSN: 0013-4686
Fraunhofer IKTS ()
anodic cobalt dissolution; electrochemical machining (ECM); grain orientation; in situ microscopy; surface texture

The anodic dissolution of hcp-cobalt in sodium nitrate solution under near-ECM conditions was investigated in situ by using a specially designed flow channel cell. The in situ investigation was focused on current densities of 5A/cm2 and 10A/cm2. Cobalt dissolves actively as cobalt (II) ion with a current efficiency close to 100%. In contrast to copper, the current-voltage relation does not show an active-passive transition. The dissolution strongly depends on the crystallographic orientation of the grains. The lowest dissolution rate was observed on plains vicinal to the basal plane {0001}. No gas evolution was observed. The surface roughness is determined by the micro roughness on the individual grains.