Optimizing strength-corrosion properties in sulfuric acid environment via tailoring V–Cr composition in medium-entropy VCrCoNi alloys

The corrosion resistance of VCrCoNi medium-entropy alloys in a 0.5 M H2SO4 solution was investigated by tailoring V and Cr compositions while minimizing microstructural differences. The elemental effects were discussed regarding the formation of the passive film and its subsequent impact on corrosion resistance. The results revealed that an increase in the Cr/V ratio enhances the corrosion resistance by forming a Cr-enriched passive film. However, the elevated ratio negatively affects the mechanical strength, wherein V plays a crucial role. The optimal balance between mechanical strength and corrosion resistance was discussed based on electrochemical measurements and immersion test results.