2018 Volume 74 Issue 1 Pages 1-9
Corrosion resistance of SD345 steel, which is mainly used for reinforcing steel in concrete, was investigated by electrochemical measurements in a solution that simulates concrete with Cl-. The protective property of passive film of SD345 steel formed in saturated Ca(OH)2 solution was examined by dynamic anodic polarization and impedance measurements. It is revealed that the passive film growing with immersion time in the test solution improves the corrosion resistance of SD345 steel. However, the stability of passive film decreased in the concrete modified solution including over 0.1 M Cl-. In addition, the influence of passive film properties before corrosion test on the corrosion behavior of reinforcing steel in concrete was discussed by corrosion monitoring of SD345 steels with passive film under wet and dry cyclic environment. With increasing the growth period of passive film in the test solution, changes in the corrosion resistance of SD345 steel decreased during wet and dry cyclic environment.
