Comprehensive insights into competitive oxidation/sulfidation reactions on binary ferritic alloys at high temperatures. (15th July 2022)

• Record Type: Journal Article
• Authors: Stephan-Scherb, Christiane; Lehmusto, Juho; Falk, Florian; Sobol, Oded; Pint, Bruce A.
• Is Part Of: Corrosion science. Volume 203(2022)
• Publication Date: 2022-07-15
• Subjects: Steel -- Iron -- SIMS -- SEM -- High-temperature corrosion -- Oxidation -- Sulphidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110236
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Interpreting high-temperature corrosion induced by mixed-gas atmospheres is challenging due to the different contributions of oxidizing gases. Here, a comprehensive study on the combined oxidation/sulfidation using label molecules is presented. Fe-Cr model alloys with 2 wt% and 9 wt% Cr were isothermally exposed using a volumetric mixture of 0.5%S 16 O2 /27%H2 18 O and 0.5%S 16 O2 /7%H2 18 O at 650 °C for 5 h and then characterized by secondary ion mass spectroscopy (SIMS). Additionally, the reactions were followed in-situ utilizing energy dispersive X-ray diffraction. The study showed that both S 16 O2 and H2 18 O contribute to the oxidation of the alloys but to different extents depending on the Cr-content. Highlights: S16O2 an H218O contribute both to oxidation. Grown oxides are deficient in cations (Fe and Cr). Cr content in the alloy affected the extent of 18 O incorporation. Oxidation/sulfidation was followed in-situ. Differences between in-situ and ex-situ observed reaction products were demonstrated.