Investigating the oxidation and electrical behavior of AISI 304 steel coated with cobalt for the application of solid oxide fuel cell

Subject Areas :

Mohammad Reza  Ashorzadeh ¹ (Department of Metallurgy and Materials Science, Faculty of Engineering, Shahid Bahonar University of Kerman, Jomhoori Eslami Blvd., 76169-133, Kerman, Iran.)
Morteza  Zandrahimi ² (Department of Metallurgy and Materials Science, Faculty of Engineering, Shahid Bahonar University of Kerman, Jomhoori Eslami Blvd., 76169-133, Kerman, Iran.)
Hadi  Ebrahimifar ³ (Assistant Prof., Department of Materials Engineering,Faculty of Mechanical and Materials Engineering, Graduate University of Advanced Technology, Kerman, Iran)

Received: 2019-02-06 Accepted : 2019-08-06 Published : 2020-04-20

Keywords: Oxidation, Solid oxide fuel cell, Coating, Area Specific resistance (ASR), AISI 304 Austenitic Stainless Steel,

Abstract :

Oxidation resistance and electrical conductivity of stainless steels used as interconnects in solid oxide fuel cells can be improved by using a conductive and protective coating layer. In this study, AISI 304 austenitic stainless steel was coated in a cobalt powder base pack mixture. Isothermal oxidation test was used to investigate the oxidation resistance of coated and non-coated steel. Area specific resistance (ASR) was also measured as a function of oxidation time at 800 °C. Microstructure of coated and oxidized samples was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) device. The results showed that cobalt coated samples showed better oxidation resistance than non-coated samples. The results showed that increasing the temperature would increase the area specific resistance. The cobalt coating layer also converted to CoFe2O4, Co3O4 and CoCr2O4 spinels during the isothermal oxidation process. Cobalt spinels exhibited less ASR (27.4 mΩ cm2) compared to the uncoated sample (60.5 mΩ cm2).

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