A novel cobalt-free Cu 1.2 Mn 1.8 O 4 spinel coating is prepared and evaluated for the metal interconnect of solid oxide fuel cell. Mn-35Cu and Co-35Mn alloy coatings are deposited on 430 SS substrate and then in-situ oxidized in air at 750 • C for 100 h. XRD results confirm that Cu 1.2 Mn 1.8 O 4 spinel with some Mn 2 O 3 is formed, and the average thickness of the coating is 70-80 µm according to cross section image. Spinel oxide coating is compact and has good adherence to the substrate, and very low Cr and Fe contents are detected in the coating. A small area specific resistance of 8.7 mΩ cm 2 is achieved at 800 • C for the composited Cu 1.2 Mn 1.8 O 4 spinel coating, which is much less than that of the composited (Co,Mn) 3 O 4 spinel coating. The research indicates that the Cu 1.2 Mn 1.8 O 4 coating evolved by the high-energy micro-arc alloying process is a promising coating material for the metallic interconnects.
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