Abstract:The effect of the corrosion inhibitors of sodium D gluconate(SD), benzotriazole(BTA) and sodium nitrite(SN) on corrosion properties of fine grain high strength reinforcement(HRBF500 reinforcement) in simulated concrete pore solution(SCP solution) containing 3.5%NaCl(by mass) was investigated using dynamic potential polarization, electrochemical impedance spectroscopy(EIS), Mott Schottky curves and SEM techniques. The results show that adding SD to SCP solution, the corrosion processes of HRBF500 reinforcement are inhibited; the impedance value increases; the passivation film displays a typical n type semiconductor and the carrier density decreases. There are no corrosion pits on the surface of HRBF500 reinforcement. However, the corrosion electrochemical indexes of HRBF500 reinforcement are declined when BTA was added, and a great many of corrosion pits are formed. The corrosion processes of HRBF500 reinforcement are also prohibited when SN was added. SD and SN can be used as the corrosion inhibitors for HRBF500 reinforcement; while BTA is unsuitable, different from that for the plain carbon steel.