An Impedance Investigation of the Mechanism of Pure Magnesium Corrosion in Sodium Sulfate Solutions - Laboratoire Interfaces et Systèmes Electrochimiques Accéder directement au contenu
Article Dans Une Revue Journal of The Electrochemical Society Année : 2007

An Impedance Investigation of the Mechanism of Pure Magnesium Corrosion in Sodium Sulfate Solutions

Résumé

The corrosion behavior of pure magnesium in sodium sulfate solutions was investigated using voltammetry and electrochemical impedance spectroscopy with a rotating disk electrode. The analysis of impedance data obtained at the corrosion potential was consistent with the hypothesis that Mg corrosion is controlled by the presence of a very thin oxide film, probably MgO, and that the dissolution occurs at film-free spots only. This hypothesis was substantiated both by the superposition of the EIS diagrams, obtained for different immersion times and for two Na2SO4 concentrations once normalized, and by use of scanning electrochemical microscopy in the ac mode to sense the local conductivity of the material. On the basis of the electrochemical results, a model was proposed to describe magnesium corrosion at the open-circuit potential. Simulation of the impedance diagrams was in good agreement with the experimental results.
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Dates et versions

hal-00806016 , version 1 (29-03-2013)

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Geneviève Baril, Gonzalo Galicia, Claude Deslouis, Nadine Pébère, Bernard Tribollet, et al.. An Impedance Investigation of the Mechanism of Pure Magnesium Corrosion in Sodium Sulfate Solutions. Journal of The Electrochemical Society, 2007, vol. 154, pp.C108-C113. ⟨10.1149/1.2401056⟩. ⟨hal-00806016⟩
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