Corrosion behavior of Cr modified HRB400 steel rebar in 2%NaCl solution

Corrosion behavior of the Cr modified HRB400 carbon steel rebar in 2%NaCl solution was investigated by means of dry/wet cyclic corrosion test, potentiodynamic polarization and electrochemical impedance spectroscopy. Results show that the open circuit potential moved to higher value in positive direction; the corrosion current density decreased; the polarization resistance increased and the corrosion rate declined for the Cr modified steel in comparison to HRB400 steel. After dry/wet cyclic corrosion test for 72 h, the HRB400 steel exhibited an uniform corrosion morphology, however the Cr modified steel rebar exhibited features of local corrosion. Anyhow, the addition of Cr can significantly reduce the uniform corrosion rate of HRB400 steel rebar.