Abstract
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.
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