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In this paper, the differences in the passivation behaviours of low alloy steel rebars in saturated Ca(OH)2 solution (SC) and cement extract solution (CE) were studied by Mott-Schottky, XPS and cyclic potentiodynamic polarisation (CPP) analyses. The results indicate that the formation rate of a passive film in SC is faster than that in CE at the initial stage of immersion. With the same passivation time, the passive film that formed in CE has a lower self-corrosive current density, a greater film resistance, a thicker film and better stability than the film formed in SC. The passive films formed in SC and CE have the same composition, and they both exhibit n-type semiconductor characteristics, but the passive films formed in CE have a lower donor carrier concentration and better compactness than those formed in SC. The unpassivated steel has a higher critical Cl concentration in SC. However, after the steel rebar is passivated for 7 days, the critical Cl concentration in CE is higher than that in SC. The critical Cl concentration of passivated steel rebars is 4 times higher than that of unpassivated steel rebars, which indicates that passive films can significantly improve the pitting corrosion resistance of steel rebars.

Electrochemical Investigation of Passive Film Properties on Low Alloy Steel Rebars in Cement Extract and Saturated Ca(OH)2 Solutions