To address the high-temperature oxidation issue of SUS430 interconnects for solid oxide fuel cell (SOFC), the electrophoretic deposition to fabricate an Mn-Co spinel coating was employed, and key process parameters including annealing temperature, holding time, heating rate, and atmosphere were optimized. The experimental results demonstrate that the optimized two-step thermal conversion process (holding for 2 h at 1 050 ℃ in N₂ atmosphere, followed by heating at 2 ℃/min to 825 ℃ and holding for 2 h in air) yields a high-performance coating. The coating exhibits remarkable oxidation resistance, with an oxidation rate constant (2.4414×10^–12 g²·cm^?4·s^?1) which is one order of magnitude lower than that of the blank specimen after 400 h high-temperature oxidation. Furthermore, the Mn-Co spinel coating has a Cr content (mass fraction of 7.06%) significantly lower than that in the blank specimen (mass fraction of 44.92%). This coating can effectively suppress the volatilization and diffusion of Cr.