A Co-Pd film was deposited on 316L stainless steel by electroplating. The erosion–corrosion behavior ofthe Co-Pd plated samples in hot sulfuric acid solution with SiO2particles was investigated. The resultsshowed that there was a significant synergistic effect between erosion and corrosion. At higher stirringspeed, even in such strong corrosive environment the erosion–corrosion rate of Co-Pd plated samples wascontrolled mainly by the erosion resistance. The erosion–corrosion resistance of pure Pd plated sampledecreased rapidly with increasing stirring speed, whereas that of Co-Pd plated sample kept almost stableunder the tested conditions due to the high micro-hardness and good corrosion resistance of the film.