Study on corrosion resistance of CoCrFeNiTi0.2Mox high entropy alloy in acidic and alkaline solutions

Abstract

Using vacuum arc melting, a new alloy called CoCrFeNiTi0.2Mox (x=0, 0.1, 0.3) was made. We tested corrosion resistance in acidic and alkaline environments by using electrochemical methods. The consequences substantiated that the corrosion resistance of the alloy improved in terms of solvents and molybdenum content, despite some variation in the polarization curves. In 1 mol/L sulfuric acid, the polarization curve of high entropy alloy shows activation, activation-passivation, and passivation stages, and in 1 mol/L caustic soda solution, the polarization curve of CoCrFeNiTi0.2Mox alloys directly changes from the vital polarization region to the passivation region.