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

Abstract : 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [12 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00806016
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, March 29, 2013 - 12:41:51 PM
Last modification on : Thursday, October 24, 2019 - 11:38:03 AM
Long-term archiving on : Sunday, June 30, 2013 - 4:00:58 AM

File

baril_2419.pdf
Files produced by the author(s)

Identifiers

Citation

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, Electrochemical Society, 2007, vol. 154, pp.C108-C113. ⟨10.1149/1.2401056⟩. ⟨hal-00806016⟩

Share

Metrics

Record views

188

Files downloads

979