Influence of Cl- on Corrosion Behavior of Steel HPB300 in Simulated Concrete Pore Solution

Free corrosion, liner polarization, potentiodynamic polarization, SEM and XRD were used to investigate the influence of Cl- on the corrosion behavior of steel HPB300 in simulated concrete pore solution. The results indicate that Cl- is an important factor causing steel to corrosion. With the increase of Cl- concentration, free corrosion potential changed negatively, and seawater concentration did not affect the stable free corrosion potential when the concentration of Cl- reached 0.25 mol/L; linear polarization resistance Rp decreased gradually, anodic passive range of potentiodynamic polarization narrowed gradually, breakdown potential changed negatively from 0.6 V to -0.3 V(SCE). The main corrosion products were FeO(OH) and FeCl2, and the porosity reduced, micro morphology shape changed from sheet into massive shape.