Cyclic Oxidation Of Mn-co Spinel Coated Sus 430 Alloy In The Cathodic Atmosphere Of Solid Oxide Fuel Cells

摘要

In order to improve oxidation resistance and long-term stability of the metallic interconnects and prevent the cathode of solid oxide fuel cells (SOFCs) from Cr-poisoning, an effective, relatively dense and well adherent Mn-Co spinel protection coating with a nominal composition of MnCo_2O_4 is applied onto the surfaces of the SUS 430 ferritic stainless steel by a cost-effective sol-gel process. The long-term thermally cyclic oxidation kinetics and oxide scale structures as well as the composition of the coated SUS 430 alloy are investigated. The Mn-Co spinel protection layer demonstrates an excellent structural and thermome-chanical stability, and effectively acts as a mass barrier to the outward diffusion of cations, especially Cr, and a lowered parabolic rate constant of k_p = 1.951 × 10~(-15) g~2cm~(-4)s~(-1) is obtained.