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Microstructure and Oxidation Behavior of Cobalt Diffusional Coating Fabricated on AISI 429 Stainless Steel

  • Hadi EbrahimifarEmail author
Original Paper
  • 13 Downloads

Abstract

The best candidates for interconnects in solid oxide fuel cells are chromia-forming alloys. However, the low oxidation resistance of these materials needs to be solved to obtain better performance of the interconnect. The aim of this study was to coat AISI 429 ferritic stainless steel with a cobalt-based layer using pack cementation technique. For investigating the oxidation behavior of the coated and uncoated AISI 429 steel, three types of oxidation tests were conducted: isothermal oxidation at 750 °C; cyclic oxidation at 750 °C; and oxidation at different temperatures (400–900 °C). The cobalt-based coating and oxide scales formed were studied by X-ray diffraction and scanning electron microscopy. The cobalt-based coating converted to Co3O4, CoFe2O4, and CoCr2O4 spinels during oxidation exposure. The results showed that the cobalt spinels improved oxidation resistance through the decrease in Cr2O3 growth.

Keywords

Oxidation Cobalt Coating Microstructure SOFC 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Materials Engineering, Faculty of Mechanical and Materials EngineeringGraduate University of Advanced TechnologyKermanIran

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