Selective dissolution and surface enrichment of alloy components of passivated Fe18Cr and Fe18Cr3Mo single crystals |
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| Authors: | C Leygraf G Hultquist I Olefjord B-O Elfström VM Knyazheva AV Plaskeyev YaM Kolotyrkin |
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| Affiliation: | Department of Physical Chemistry, The Royal Institute of Technology, S-100 44 Stockholm 70, Sweden;Department of Engineering Metals, Chalmers University of Technology, S-402 20 Göteborg, Sweden;Karpov Institute of Physical Chemistry, Moscow B-120, U.S.S.R. |
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| Abstract: | The possible surface enrichment of chromium and molybdenum during dissolution of Fe18Cr (110) and Fe18Cr3Mo (110) alloys at constant potentials in the passive region is elucidated by taking into account quantitative information on partial dissolution rates of alloy components as measured by γ-spectrometry and on chemical composition of passivating films as measured by ESCA and AES. Combining results from all methods it is found that chromium under all conditions is enriched in the passivating films. An accumulation of chromium in the alloy is also indicated. For molybdenum, an enrichment in the passive film is observed at ? 0.2 V (SCE), whereas in the potential interval 0.1–0.9 V, the molybdenum enrichment as determined by ESCA and AES is hardly significant. On the other hand, γ-spectrometry gives a clear indication of molybdenum enrichment in both potential regions. |
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