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Title: Study of parabolic rate constant for coated AISI 430 steel with Mn3O4 and MnFe2O4 spinels
Authors: Ebrahimifar, Hadi
Zandrahimi, Morteza
Keywords: Parabolic rate constant;AISI 430 ferritic stainless steel;Oxidation;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 (kp) 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 Mn3O4 and MnFe2O4 spinels during oxidation caused to the improvement of the oxidation resistance.
Page(s): 314-320
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.18(4) [August 2011]

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