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Incorporation of Cr in the passive film on Fe from chromate solutions |
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| Authors: | HS Isaacs S VirtanenMP Ryan P SchmukiLJ Oblonsky |
| Affiliation: | a Materials Sciences Division (MSD), Brookhaven National Laboratory, Bldg 480 P.O. Box 5000, Upton, NY 11973-5000, USA b Department of Materials and Institute of Materials Chemistry and Corrosion, Swiss Federal Institute of Technology, ETH-Hoenggerberg, 8093 Zurich, Switzerland c Department of Materials, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BP, UK d Department for Material Science, University of Erlangen-Nuremberg, LKO, Martensstr. 7, D-91058 Erlangen, Germany e DuPont Technologies, Microcircuit Materials, P.O. Box 13999, Research Triangle Park, NC 27709-3999, USA |
| Abstract: | The uptake of Cr species from chromate solutions by Fe has been studied using X-ray absorption near edge structure (XANES). The objective of the investigation was to compare XANES with radioactive tracer techniques used by Brasher et al. Cr(III) was detected on the passive iron surface. The amount of Cr(III) was increased by cathodic polarization and decreased by anodic polarization. This demonstrated that the uptake of Cr(III) was the result of cathodic processes and was not a direct result of the growth of the passive oxide film. Cr(VI) was only found after Fe was exposed to a saturated dichromate solutions for extended periods indicating that Cr(VI) was not strongly absorbed on the passive film. |
| Keywords: | X-ray absorption spectroscopy Iron passivity Chromium species Chromate inhibitor Chromate adsorption |
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