11-23% Cr steels for solid oxide fuel cell interconnect applications at 800?C- How the coating determines oxidation kinetics

卷:48

Article

关键词: FERRITIC STAINLESS-STEEL;    HIGH-TEMPERATURE OXIDATION;    IRON-CHROMIUM ALLOYS;    ELECTRICAL-CONDUCTIVITY;    LONG-TERM;    METALLIC INTERCONNECTS;    COMPOSITE COATINGS;    GROWTH MECHANISMS;    THERMAL-EXPANSION;    BEHAVIOR;   

DOI  :  10.1016/j.ijhydene.2022.11.326

来源: SCIE

【 摘 要 】

The present work investigates the low-cost steels AISI 441, AISI 430, and AISI 444 against the tailor-made high Cr steel Crofer 22 APU (22.9 wt% Cr) at 800 degrees C in simulated solid oxide fuel cell (SOFC) cathode conditions. Furthermore, a low Cr steel, AISI 409 (11.4 wt% Cr) is included in the study. The oxidation, chromium evaporation, and area-specific resistance (ASR) of the uncoated and Ce/Co-coated steels are studied for up to 3000 h. Ce/Co-coated steels showed significant improvement in behaviour compared to their uncoated coun-terparts. The oxidation and chromium evaporation behaviour between the uncoated steels varied substantially while the Ce/Co coated steels exhibited highly similar behaviour. The area-specific resistance of the coated low-cost steels was on par with Crofer 22 APU. However, 430 formed a continuous silica layer, resulting in a higher ASR after 3000 h. Cross-sections of the uncoated and Ce/Co-coated steels were analysed using a scanning electron microscope and energy dispersive X-ray spectroscopy.(c) 2022 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/ licenses/by/4.0/).

【 授权许可】

Free