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

Protective coatings that resist oxide scale growth and decrease chromium evaporation are necessary to makestainless steel interconnect materials for long-term durable operation of solid oxide fuel cells (SOFCs). Inthis study a layer of manganese was coated on the surface of AISI 441 ferritic stainless steel which is used insolid oxide fuel cells for interconnect applications. The oxidation behavior of coated substrates was studiedas a function of time at operating conditions of SOFCs. Cyclic oxidation has been also tested at 800 ºC for100 cycles. Manganese coating during isothermal oxidation caused to the oxidation resistance by limitingthe outward diffusion of Cr cation and the inward diffusion of oxygen anion. Results of cyclic oxidationexhibited that the coated substrates demonstrate good resistance against the spallation and cracking.