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Title: Study of parabolic rate constant for coated AISI 430 steel with Mn<sub>3</sub>O<sub>4</sub> and MnFe<sub>2</sub>O<sub>4 </sub>spinels
Authors: Ebrahimifar, Hadi
Zandrahimi, Morteza
Keywords: Parabolic rate constant
AISI 430 ferritic stainless steel
Solid oxide fuel cell (SOFC)
Issue Date: Aug-2011
Publisher: NISCAIR-CSIR, India
Abstract: The oxidation resistance of AISI 430 ferritic stainless steels which are used as interconnects in solid oxide fuel cells (SOFCs) for the intermediate temperature operation can be improved with a protective coating layer. In this study, the pack cementation method is employed to coat AISI 430 ferritic stainless steel. Isothermal oxidation, cyclic oxidation and oxidation at different temperatures (600-900°C) are applied to evaluate the parabolic rate constant. The coated samples demonstrated lower parabolic rate constant (<i style="">k</i><sub>p</sub>) in each test and it indicates that the coating layer has acted as a mass barrier against the outward diffusion of cations specially chromium. XRD analysis revealed that the formation of Mn<sub>3</sub>O<sub>4</sub> and MnFe<sub>2</sub>O<sub>4 </sub>spinels during oxidation caused to the improvement of the oxidation resistance.
Description: 314-320
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.18(4) [August 2011]

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