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A kinetic study on the corrodability of anodic oxide films formed on molybdenum in NaOH solutions

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Abstract

The corrodability of anodic oxide films formed on molybdenum in NaOH solutions was studied using impedance and potential measurements. The corrosion rate was found to increase with increase of alkali concentration, film thickness and temperature and was nearly independent of the rate of oxide formation. The dissolution process was found to involve a valency change from Mo(IV) to Mo(VI) where it seemed, from cathodic polarization, that no electron transfer through the oxide film to/from the metal surface was involved during the dissolution process. In concentrated NaOH solutions ([OH−]≧9 M), the dissolution process appeared to follow zero-order kinetics.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt

    A. G. Gad-Allah, H. A. Abd El-Rahman & M. M. Abou-Romia

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  1. A. G. Gad-Allah
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  2. H. A. Abd El-Rahman
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  3. M. M. Abou-Romia
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Gad-Allah, A.G., Abd El-Rahman, H.A. & Abou-Romia, M.M. A kinetic study on the corrodability of anodic oxide films formed on molybdenum in NaOH solutions. J Appl Electrochem 18, 86–91 (1988). https://doi.org/10.1007/BF01016209

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  • DOI: https://doi.org/10.1007/BF01016209

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