Manufacture of Co-containing coating on AISI430 stainless steel via pack cementation approach for SOFC interconnect |
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| Affiliation: | 1. Key Lab of Ship-Machinery Maintenance & Manufacture, Dalian Maritime University, Dalian 116026, China;2. School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China;1. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Science, No. 62, Wencui Road, Shenyang, 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, No. 96, JinZhai Road Baohe District, Hefei, Anhui, 230026, China;1. Department of Applied Science and Technology, DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany;3. Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, 4000 Roskilde, Denmark;1. Center for Fuel Cell Innovation, State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, China;1. Shenyang National Laboratory for Materials Science, Northeastern University, No.3-11 Wenhua Road, Shenyang, 110819 China;2. School of Metallurgy, Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, No.3-11 Wenhua Road, Shenyang, 110819 China |
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| Abstract: | Stainless steel can be applied as interconnect materials in solid oxide fuel cells (SOFCs) at operating temperatures 600–800 °C. Chromium (Cr)-forming stainless steel as an interconnect plate possesses a low oxidation resistance at high temperature and electrical conductivity, and volatility of Cr oxide scale can poison the cathode material. One effective strategy is to use a surface coating to improve interconnect performance. This work is to form cobalt (Co)-containing coatings on the surface of AISI 430 ferritic stainless steel interconnect via pack cementation approach. The resultant coating is extremely effective at heightening the oxidation resistance and electrical conductivity of AISI 430 ferritic stainless steel. The area specific resistance of samples was measured as a function of time. The area specific resistance of coated sample with 2% of activator content and holding time of 2 h is 90.21 and 108.32 mΩ cm2 after 450 h of oxidation in air, respectively. Additionally, the coated sample with 2% of activator content and holding time of 2 h has a weight change of merely 0.299 and 0.231 mg/cm2 after 650 h of isothermal oxidation at 800 °C, separately. The results displayed that the formation of CoFe2O4 spinel coating enhanced oxidation resistance by inhibiting the outward diffusion of Cr cations and the inward diffusion of oxygen anions. |
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| Keywords: | Solid oxide fuel cells Interconnect Cobalt-containing coatings AISI 430 ferritic stainless steel Pack cementation approach |
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