Investigation of the oxidation behavior of Mn-coated AISI 441 steel for SOFCs interconnect application

Document Type : Research Paper

Abstract

Protective coatings that resist oxide scale growth and decrease chromium evaporation are necessary to make
stainless steel interconnect materials for long-term durable operation of solid oxide fuel cells (SOFCs). In
this study a layer of manganese was coated on the surface of AISI 441 ferritic stainless steel which is used in
solid oxide fuel cells for interconnect applications. The oxidation behavior of coated substrates was studied
as a function of time at operating conditions of SOFCs. Cyclic oxidation has been also tested at 800 ºC for
100 cycles. Manganese coating during isothermal oxidation caused to the oxidation resistance by limiting
the outward diffusion of Cr cation and the inward diffusion of oxygen anion. Results of cyclic oxidation
exhibited that the coated substrates demonstrate good resistance against the spallation and cracking.

Keywords

• Oxidation
• Solid oxide fuel cell
• AISI 441 ferritic stainless steel
• Interconnect

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