Corrosion Behavior of Reinforced Steel Bar with Different Surface States in the Progress of Cl^- Invasion

The corrosion behavior of reinforced steel with different surface states in steel bar immersed in simulated solution containing Cl- was investigated by electrochemical measurements, scanning electron microscopy with energy dispersive X-ray spectrometer (SEM/EDX). The changes of corrosion potential and corrosion current density of reinforced steel with the immersion time were obtained, and the morphology of samples with different surface states was analyzed. The results show that the corrosion behavior of reinforced concrete was different in different immersion stages. The stability of passive film formed on the polished steel was better than that of as-supplied steel at the initial stage was when Cl- did not reach the surface of steel. The corrosion rate of as-supplied steel was larger than that of polished steel with the increase of Cl- ions on the surface of steel due to the rough surface caused by thermal oxidation in manufacture process.