The Effect of Mo Addition on Oxygen Vacancies in the Oxide Scale of Ferritic Stainless Steel for SOFC Interconnects

The concentration and diffusion coefficient of oxide ion vacancies in the oxide scale formed on Fe-22Cr-0.5Mn ferritic stainless steel with and without molybdenum (Mo) was measured at 800℃ by the electrochemical polarization method. After pre-oxidation for 100 h in ambient air at 800 ℃, the oxide sc...

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Bibliographic Details
Published inCorrosion science and technology Vol. 23; no. 1; pp. 33 - 40
Main Authors Dae Won Yun, Hi Won Jeong, Seong Moon Seo, Hyung Soo Lee, Young Soo Yoo
Format Journal Article
LanguageKorean
Published 한국부식방식학회 28.02.2024
Subjects
Interconnect
Molybdenum
Oxidation
Solid oxide fuel cell
Stainless steel
Interconnect
Oxidation
Solid oxide fuel cell
Molybdenum
Stainless steel
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Summary:The concentration and diffusion coefficient of oxide ion vacancies in the oxide scale formed on Fe-22Cr-0.5Mn ferritic stainless steel with and without molybdenum (Mo) was measured at 800℃ by the electrochemical polarization method. After pre-oxidation for 100 h in ambient air at 800 ℃, the oxide scale on one side was completely removed with sandpaper. A YSZ plate was placed on the side where the oxide scale remained. Platinum (Pt) meshes were attached on the top of the YSZ plate and the side where the oxide scale was removed. Changes in electrical current were measured after applying an electrical potential through Pt wires welded to the Pt meshes. The results were interpreted by solving the diffusion equation. The diffusion coefficient and concentration of oxide ion vacancy decreased by 30% and 70% in the specimen with Mo, respectively, compared to the specimen without Mo. The oxide ion vacancy concentration of chromia decreased due to the addition of Mo.
Bibliography:The Corrosion Science Society of Korea
KISTI1.1003/JNL.JAKO202410280819907
ISSN:1598-6462
2288-6524