Temperature dependence of corrosion of ferritic stainless steel in dual atmosphere at 600–800 °C
Artikel i vetenskaplig tidskrift, 2018

The ferritic stainless steel AISI 441 (EN 1.4509) is exposed for 1000 h to air - 3% H2O on one side and to Ar - 5% H2 – 3% H2O on the other at temperatures 600, 700, and 800 °C. Conditions are chosen to mimic the environment of metallic interconnects in an operating solid oxide fuel cell (SOFC). At 600 °C, ∼25 μm thick Fe2O3/(Fe,Cr)3O4 forms on large parts of the air side of the samples. Reference samples exposed to air - 3% H2O on both sides form thin protective layers of (Cr,Mn)3O4/Cr2O3 at the same temperature. At higher temperatures, 700 and 800 °C, all samples form protective layers of (Cr,Mn)3O4/Cr2O3 regardless of exposure to single or dual atmosphere. It is concluded that corrosion resistance in a dual atmosphere has an inverse dependence on temperature. Different hypotheses for the underlying cause for the dual atmosphere effect are discussed and compared to the experimental data.

High temperature oxidation

Dual atmosphere

AISI 441

Interconnect

Solid oxide fuel cells

Hydrogen

Författare

Patrik Alnegren

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Mohammad Sattari

Chalmers, Fysik, Materialens mikrostruktur

Jan-Erik Svensson

Chalmers, Kemi och kemiteknik, Energi och material

Jan Froitzheim

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Journal of Power Sources

0378-7753 (ISSN)

Vol. 392 129-138

Ämneskategorier

Oorganisk kemi

Energiteknik

Materialkemi

Styrkeområden

Energi

Materialvetenskap

DOI

10.1016/j.jpowsour.2018.04.088