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The passivation behaviour of passive films on the surface of reinforcing steels exposed to alkaline solutions was investigated. Two types of reinforcing steels (low-carbon steel and low-alloy steel) with different surface conditions (polished steel with uniform surface and as-received ribbed surface with mill scale) were chosen to compare their passivation capability. Moreover, steels were exposed to high-alkaline simulated concrete pore solution and low-alkaline saturated Ca(OH) 2  solution for 10 d to form passive films spontaneously. The results reveal that the passivation capability of steels was significantly affected by the surface condition, whereas the influence of steel type and alkaline solution was relatively less pronounced.

Influence of surface condition, steel type and alkaline solution on passivation capability of reinforcing steels