abstract
The study investigates how pre-oxidation conditions affect the properties of cobalt-free protective coatings for solid oxide fuel cell (SOFC) interconnects. Coatings were composed of commercial spinel CuMn1.9Fe0.1O4, applied to Crofer 22 APU via electrophoretic deposition (EPD). Steel samples underwent pre-oxidation at 600-850 degrees C in air. Pre-oxidation at 800 degrees C proves to be the most effective, forming a uniform oxide layer that reduced ASR by over 50 % compared to pristine steel. All coatings demonstrate consistent thickness (13-26 mu m) and low porosity (11-13 %), with structural characteristics that effectively limit gas-phase transport. Following sintering, XRD studies revealed a dual-phase composition of the coatings comprising spinel (Cu,Mn)3O4 and bixbyite (Mn,Fe)2O3, which is likely to enhance Cr trapping while remaining stable electrically and mechanically. Analysis using artificial neural networks (ANN) based on ASR results confirm that pre-oxidation at 800 degrees C ensures mid-term stability, with minimal chromium diffusion observed after 200 h of testing at 700 degrees C.
keywords
FERRITIC STAINLESS-STEEL; ELECTRICAL-PROPERTIES; ELECTROPHORETIC DEPOSITION; METALLIC INTERCONNECTS; OXIDATION BEHAVIOR; THERMAL-EXPANSION; OXIDE; CONDUCTIVITY; MANGANESE; FE
subject category
Chemistry; Electrochemistry; Energy & Fuels
authors
Lazor, M; Naumovich, Y; Ajdys, L; Yaremchenko, A; Zurawska, A; Wiecinska, P
our authors
Aleksey Yaremchenko
Principal ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
The authors would like to acknowledge financial support from the National Science Centre Poland (NCN) OPUS-25 project number UMO2023/49/B/ST8/03265: "Alternative to alloying: advanced protective coatings for low-cost alloys for solid oxide cell stack technology", and from the Faculty of Chemistry at Warsaw University of Technology, Poland. A.Y. acknowledges financial support within the project CICECOAveiro Institute of Materials (UIDB/50011/2020 (DOI: 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI: 10.54499/UIDP/50011/2020) , and LA/P/0006/2020 (DOI: 10.54499/LA/P/0006/2020) ) financed by national funds through the FCT/MCTES (PIDDAC) , Portugal.r financed by national funds through the FCT/MCTES (PIDDAC) , Portugal.