Abstract
In-situ gamma scattering and ex-situ conversion electron Mössbauer, and Auger spectroscopy were applied to investigate anodic layers on steel. Samples treated in the active potential range in phosphate buffer solution show a Fe(II)-phosphate deposit on the surface. After treatment in the passive potential region, only Fe 3+ was found to exist in the oxide layer. The passive layer does not consist of stoichiometric oxidic phases.
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Reference
N. Sato andG. Okamoto, Electrochemical passivation of metals, in Comprehensive treatise of electrochemistry, vol. 4, ed. J.O 'M. Bockris (Plenum Press, New York 1981).
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The financial support of this work by the Deutsche Forschungsgemeinschaft is greatly acknowledged.
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Stumm, U., Meisel, W. & Gütlich, P. Anodic layers formed on steel in phosphate buffer solution. Hyperfine Interact 28, 923–925 (1986). https://doi.org/10.1007/BF02061595
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DOI: https://doi.org/10.1007/BF02061595