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19.04.2020 | Ausgabe 6/2020 Open Access

Metallurgical and Materials Transactions A 6/2020

Investigation of Surface Segregation in Fe-Cr-Si Alloys by XPS

Metallurgical and Materials Transactions A > Ausgabe 6/2020
K. Idczak, R. Idczak
Wichtige Hinweise
Manuscript submitted November 6, 2019.

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The surface segregation of Fe-Cr-Si alloys was studied using the X-ray photoelectron spectroscopy (XPS). The experiment was performed in two stages, for the as-prepared samples and after oxidation process. Analysis of measured XPS spectra allowed one to characterize the changes in the surface chemical composition during the oxidation and thermal treatment procedures. According to the obtained results, it could be stated that the enhanced anti-corrosion properties of the Fe-Cr-Si alloys which contain more than 10 at. pct of Cr and 5 at. pct of Si in the bulk are mainly connected with the strong surface segregation process of both solutes. In the case of alloys which contain less solutes (Fe0.94Cr0.03Si0.03, Fe0.90Cr0.05Si0.05), the behavior of Cr atoms is different during the oxidation process. Chromium does not segregate to the surface, instead it diffuses into deeper parts of the material leaving the surface covered only by silicon and iron oxides. This effect is responsible for much worse corrosion resistance of the Fe0.94Cr0.03Si0.03 and Fe0.90Cr0.05Si0.05 alloys.

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