The electrochemical methods of the potentiodynamic polarization, the electrochemical impendence spectroscopy and the dry/wet cycle corrosion test are employed to investigate the corrosion behavior of the Cr modified HRB400 carbon steel rebar in 0.01 mol/L NaHSO₃ solution. The open circuit potential of the Cr modified steel shifts in the positive direction as compared with the HRB400 carbon steel; The results of the polarization curve show that the corrosion current density of the Cr modified steel is decreased, the polarization resistance is increased and the corrosion rate is declined. After the dry/wet cycle corrosion test for 72 h, the corrosion morphologies of the HRB400 steel and the Cr modified steel see a uniform corrosion, the addition of the Cr element can significantly reduce the corrosion rate of the HRB400 steel rebar.

alloy  /  open circuit potential  /  electrochemical impedance spectroscopy  /  potentiodynamic polarization  /  corrosion rate