Effect of Ti on the corrosion behavior of (FeCrCoNi)100−xTix alloy

A (FeCrCoNi) 100-x Ti x system was designed and prepared, and the corrosion behavior of the alloy in NaCl and H 2 SO 4 was studied. Potentiodynamic polarization curves and EIS tests show that the passive corrosion current density decreases with the increase of Ti content. XPS analysis shows that the passive film has a double-layer structure, and the outer TiO 2 of the passive film and the Cr 2 O 3 of the inner layer play an important role in the corrosion resistance of the alloy. With increasing Ti content, the density of carriers in the passivation film decreases, and the alloy passivation film is denser and has better protection performance. • The electrochemical behavior and passivation behavior of FeCrCoNiTix high entropy alloy in NaCl and H 2 SO 4 solution were studied • The passivation film of FeCrCoNiTix high entropy alloy has a double layer structure • The addition of Ti reduces the carrier density of the passivated film and improves the corrosion resistance of the passivated film