The Effect of Electrodeposition Parameters on the Corrosion Resistance of FeCoNiCrMo High‐Entropy Alloy Coating on the Surface of Aluminum Alloy

Abstract

In the field of new energy vehicles, enhancing the corrosion resistance of aluminum alloy terminals while maintaining their high conductivity presents a significant challenge. Traditional anodized Al alloy surfaces fail to meet service conductivity demands. Here, a FeCoNiCrMo high‐entropy coating was electrodeposited on 6061 Al substrates following zinc immersion and electroless Ni plating. Deposition variables, including current density, bath pH, temperature, and Mo addition, were examined for their influence on morphology, conductivity, and corrosion resistance. Electrochemical measurements and conductivity tests demonstrated that the coating produced at a current density of 2 A/dm 2 , a pH value of 2.5, and a temperature of 35 °C showed outstanding performance in both conductivity and corrosion protection. Under such optimized parameters, the coating exhibited a compact microstructure, reached an electrical conductivity of 39.59% international annealed copper standard, and achieved a low corrosion current density of 5.253 × 10 −7 A/cm 2 . More importantly, we established a direct relationship between the mixing entropy and the corrosion resistance of this Mo‐containing quinary alloy, which has not been previously reported for this system. It also demonstrates that the addition of molybdenum further enhances both the conductive and anticorrosive properties of the coating.