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Kinetics of Anodic Dissolution of a Hydrophilic Metal: Effect of the Surface Morphology

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Abstract

Current-voltage curves for the anodic dissolution of iron in acid chloride and sulfate solutions containing Cl–, Br–, and I– ions are calculated. Calculations, made on the basis of a model of spatial separation of dissolution and passivation processes, account for the formation of pairs of kinks on stationary steps. The calculated curves quantitatively coincide with those found in literature. It is shown that portions of “passivity” in the curves are caused by specifically adsorbed anions, which hinder motion of kinks, while regions of “nonpolarizability” are connected not with the desorption of anions but with accelerated formation of vacancies on the steps, generating fresh active dissolution centers.

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Authors and Affiliations

  1. Russian Federation Scientific Center, “Karpov Research Institute of Physical Chemistry”, (Obninsk Branch), Obninsk, Kaluga oblast, 249020, Russia

    R. M. Lazorenko-Manevich & L. A. Sokolova

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  1. R. M. Lazorenko-Manevich
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  2. L. A. Sokolova
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Lazorenko-Manevich, R.M., Sokolova, L.A. Kinetics of Anodic Dissolution of a Hydrophilic Metal: Effect of the Surface Morphology. Russian Journal of Electrochemistry 39, 1104–1110 (2003). https://doi.org/10.1023/A:1026179621950

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