| Summary: | Cr<sub>2</sub>O<sub>3</sub> scale growth and volatilization are the main cause of the performance degradation of solid oxide fuel cells (SOFCs) with an Fe-based ferritic stainless steel (FSS) interconnect. In this work, an amorphous Ti(Nb)-Si-C coating is prepared on the pre-oxidized SUS430 with D.C. magnetron sputtering as the protective coating. The amorphous Ti(Nb)-Si-C coated alloy exhibits significantly enhanced oxidation resistance, and the oxidation kinetics obey the parabolic law with a low parabolic rate of 9.36 × 10<sup>−15</sup> g<sup>2</sup>·cm<sup>−4</sup>·s<sup>−1</sup>. A dual-layer oxide scale is formed composed of an inner layer rich in Cr<sub>2</sub>O<sub>3</sub> and an outer layer rich in rutile TiO<sub>2</sub> and amorphous SiO<sub>2</sub>. MnCr<sub>2</sub>O<sub>4</sub> appears at the interface between the inner and outer oxide layers. Meanwhile, the amorphous Ti(Nb)-Si-C coating also effectively blocks the outward diffusion of Cr. In addition, the coated steel presents good electrical properties with an area-specific resistance (ASR) of 13.57 mΩ·cm<sup>2</sup> at 800 °C after oxidation at 800 °C in air for 500 h.
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