Evaluating candidate materials for balance of plant components in SOFC: Oxidation and Cr evaporation properties. (September 2021)

• Record Type: Journal Article
• Authors: Reddy, Mareddy Jayanth; Svensson, Jan-Erik; Froitzheim, Jan
• Is Part Of: Corrosion science. Volume 190(2021)
• Publication Date: 2021-09
• Subjects: Solid oxide fuel cell -- Balance of plant -- Chromium evaporation -- Alumina former -- Denuder technique; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109671
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Prospective Fe- and Ni-base alloys are investigated for application in BOP components. Cr, Al-lean FeCrAl alloy, A197 forms a protective oxide layer even at 650 °C. A197 has two orders of magnitude lower chromium evaporation than AISI 441 and AISI 444 at 650 °C and 850 °C. Alloy 800H formed a protective Fe-Ni spinel layer on the top of the chromia scale when exposed at 850 °C. The oxidation behaviour of the selected alloys at 650 °C improved upon pre-oxidation. Abstract: Balance of plant (BOP) components made of metallic materials in solid oxide fuel cells are subject to high-temperature corrosion and are a significant source of volatile chromium species. Prospective Fe and Ni-base alloys, AISI 441, AISI 444, a FeCrAl alloy A197/Kanthal® EF101, alloy 600, and alloy 800H are investigated for their suitability to BOP components. Oxidation kinetics and chromium evaporation were employed to study the selected alloys at 650 °C and 850 °C for 500 h. A197 performed the best while AISI 441 and AISI 444, performed the worst. Pre-oxidation significantly improved the performance of the alloys at 650 ⁰C.