Abstract
The evolution under open-circuit conditions of iron passive films formed at 0.8 VSCE in a borate buffer solution at pH 8.4 was investigated with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. The composition of the freshly formed passive film as determined by X-ray photoelectron spectroscopy (XPS) was found to be in agreement with a bilayer model, where the inner layer is composed mainly of iron oxide and the outer layer consists of a hydrated material. Results of XPS measurements also showed that the open-circuit breakdown of passive films was consistent with a reductive dissolution mechanism. When the iron electrode reached an intermediate stage in the open-circuit potential decay (approximately −0.3 VSCE), the oxide film, containing both Fe(II) and Fe(III), was still protective. The impedance response in this stage exhibited a mixed control by charge transfer at the metal/film and film/solution interfaces and diffusion of point defects through the film. At the final stage of the open-circuit potential decay (approximately −0.7 VSCE), the oxide film was very thin, and the ratio of Fe3+/Fe2+ and O2−/OH− had decreased significantly. The impedance response also exhibited a mixed charge-transfer–diffusion control, but the diffusion process was related to transport of species in the electrolyte solution resulting from dissolution of the oxide film.
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Acknowledgements
The authors are grateful to Dr. P. Bartolo Perez and Mr. W. Cauich of CINVESTAV-Mérida for helpful discussions and technical assistance in the XPS measurements. It is also acknowledged the technical assistance of Ms. Marbella Echeverría. Finally, L.A. Toledo Matos is thankful to CONACyT-Mexico for providing a scholarship for his doctoral studies.
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Toledo-Matos, L.A., Pech-Canul, M.A. Evolution of an iron passive film in a borate buffer solution (pH 8.4). J Solid State Electrochem 15, 1927–1934 (2011). https://doi.org/10.1007/s10008-010-1213-7
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DOI: https://doi.org/10.1007/s10008-010-1213-7