Reinforcing steel in concrete is protected from corrosion due to the formation of a passive film on its surface. The steel passivity depends on the physical and chemical conditions in its environment. In this work, the effect of pH values, Cl~-concentrations on the corrosion behavior of reinforcing steel in the simulated concrete pore solutions have been studied by electrochemical techniques and X-ray photoelectron spectroscopy. The results indicated that the corrosion potential of the steel shifted negatively and its corrosion current density rose with the Cl' concentration increasing and pH decreasing in the solution. The passive film of the steel was mainly composed of Fe-oxides. When the Cl" concentration reached 0.6 M or pH decreased to 11.3, the steel passivity was destroyed, the Fe~(2+) atomic percentage of the steel surface film increased and the Fe~(3+) content decreased.
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