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In Situ Multielement XANES Study of Formation and Reduction of the Oxide Film on Stainless Steel
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1994
Year
EngineeringOxidation ResistanceAppropriate Fluorescence LinesChemistryChemical DepositionCorrosionElectrode Reaction MechanismEdge SpectroscopyMaterials EngineeringMaterials ScienceOxide FilmOxide ElectronicsSurface ElectrochemistrySpectroelectrochemistryElectrochemistryStainless SteelSurface ScienceMetallurgical ProcessMetal ProcessingElectrochemical Surface Science
The effectiveness of in situ multielement x‐ray absorption near edge spectroscopy for studying the passivation of alloys is demonstrated. By simultaneously windowing the appropriate fluorescence lines with a 13‐element energy‐dispersive germanium detector it is possible to measure concurrently the behavior of different alloying elements during electrochemical polarization. A thin film of stainless steel was stepped between −1.5 and +0.4 V (MSE) (the transpassive region of chromium) in a pH 8.4 borate buffer. On the first oxidation, no metal was lost and Fe and Ni showed some oxidation. On reduction, significant Fe and a barely detectable quantity of Ni dissolved. During the second oxidation, some Cr and a smaller fraction of Ni dissolved.