The dissolution of iron under cathodic polarization
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It has been shown that the dissolution rate for iron at cathodic potential is higher than expected on the grounds of the Wagner-Traud mixed potential theory. This observation cannot be explained by a parallel chemical process as suggested by Kolotyrkin et al. The dissolution appeared to be unaffected by potential, pH, cations (Li+, Na+, K+), anions (SO2-4, Cl-, ClO-4) and solvent (water-dioxan mixtures). However, the dissolution rate was decreased by an order of magnitude when the electrode was connected to a strong magnet, suggesting that the mechanical degradation of the surface under the influence of the cathodically evolved hydrogen is the main cause of the measured effects. © 1979 Pergamon Press Ltd.
Keywords:Cathodic polarization / Iron and alloys / corrosion -electrochemical
Source:Corrosion Science, 1979, 19, 7, 643-651
- Pergamon Press