(Cu, Fe)3O4 Spinel Coating Thermally Converted from Cu-Fe2O3 Composite on Steel Interconnect Via Electrophoresis-Electroplating

Abstract

A Cu-Fe2O3 composite coating was deposited on SUS 430 steel via a cost-effective approach of electrophoresis-electroplating for solid oxide fuel cell (SOFC) interconnects application. Oxidation behavior and oxide scale electrical property of the coated steels corresponding to the SOFC cathode environment were investigated. After oxidation for 5 weeks in air at 800 ℃, the oxide scale exhibits a tri-layer structure including an inner layer of Cr2O3, a middle layer of (Cu, Fe, Cr)3O4 and an outer layer of (Cu, Fe)3O4. The results demonstrate that the (Cu, Fe)3O4 spinel converted from Cu-Fe2O3 composite coating not only significantly suppresses the out-diffusion of Cr and reduces the growth rate of Cr2O3, but also lowers the area specific resistance (ASR) of the oxide scales.