Evaluation of electrophoretically deposited CuMn1.8O4 spinel coatings on Crofer 22 APU for solid oxide fuel cell interconnects

Dense and well-adhered CuMn1.8O4 spinel-oxide coatings were successfully deposited on Crofer 22 APU substrates by a cost-effective electrophoretic deposition technique. The coatings were effective in reducing the oxidation rate of the stainless steel substrates. A diffusion model has been developed that indicates that the coated stainless steel substrates exhibit paralinear oxidation kinetics. The effective diffusivities in the coating and in the thermally grown oxide scale were calculated to be 2 x 10(-15) and 2.5 x 10(-16) cm(2)/s, respectively, at 800 degrees C and 5 x 10(-16) and 1.6 x 10(-17) cm(2)/s, respectively, at 750 degrees C. The asprocessed coated sample showed only 4.6 m Omega cm(2) of area specific resistance at 800 degrees C. (c) 2008 The Electrochemical Society.