Corrosion Behavior of High Strength Steel in Reinforced Concrete Environment

Corrosion behavior of HPB300, HRB400E, and HRB500E steel bars in simulated void liquid of concrete was studied through electrochemical experiments, and the influence of Cl^- content (0.04 mol/L～0.08 mol/L) on corrosion resistance of the three steel bars was also studied. The results showed that all the three steel bars could reach a stable passivation state in the simulated pore liquid; and with the addition of Cl^-, the corrosion rate of the steel bars increased. Because HRB500E steel bar contained more Cr, Ni, V and other alloying elements, it had the smallest grain size and the best corrosion resistance.