| Popis: |
Over the past few years Raman spectroscopy has been increasingly used to characterise oxide catalysts supported on alumina, silica and titania (1–3). This has been further extended to investigate oxides produced as corrosion products on metals and alloys (4–7). Farrow and Nagelberg (4,5) have characterised a number of high temperature corrosion products formed on stainless steels finding evidence of spinel phases along with oxides of both chrcmium and iron. Tjong (6) has studied corrosion products formed at high temperatures on a range of Fe/Cr alloys of Cr content 3, 9, 12 and 18 wt% and observed different products forming on the surface as a function of time, temperature and alloy composition. Fabis et al. (7) have demonstrated the feasability of making in-situ measurements using Raman techniques, and have investigated iron, chrcmium and stainless steels in air. This work has been extended (8) to include sulphidising atmospheres using 10% H2S/N2, gas mixture. Iron sulphide, chromium sulphide and mixed sulphide phases were identified. |
