High temperature corrosion evaluation and lifetime prediction of porous Fe22Cr stainless steel in air in temperature range 700–900 °C

• Published in: Corrosion science Vol. 189; p. 109589
• Main Authors: Koszelow, D., Makowska, M., Marone, F., Karczewski, J., Jasiński, P., Molin, S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 15.08.2021; Elsevier BV
• Subjects: Alloys; Chromium; Corrosion tests; High temperature; High temperature corrosion; Oxidation; Reaction kinetics; SEM; Service life assessment; Stainless steel; Stainless steels; Thermogravimetry; X-ray diffraction; X-ray diffraction; SEM; Stainless steel; High temperature corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2021.109589

[Display omitted] •The specific surface area of porous alloys was determined by X-ray microscopy.•Porous alloys were oxidized at isothermal conditions at 700−900 °C for 100 h.•Post-mortem characterisation included SEM, XRD, and X-ray tomography.•A lifetime prediction model for porous alloys is presented. This work describes a high temperature corrosion kinetics study of ∼30 % porous Fe22Cr alloys. The surface area of the alloy (∼0.02 m2 g−1) has been determined by tomographic microscopy. The weight gain of the alloys was studied by isothermal thermogravimetry in the air for 100 h at 700–900 °C. Breakaway oxidation was observed after oxidation at 850 °C (∼100 h) and 900 °C (∼30 h). The lifetime prediction shows the investigated porous alloy can be used for >3000 h at temperatures <700 °C. At temperatures ≥700 °C, the lifetime of the porous alloy is limited by the available chromium reservoir.