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.

研究了钝化膜在暴露于碱性溶液的钢筋表面上的钝化行为。选择两种具有不同表面条件的增强型钢（低碳钢和低合金钢）（具有均匀表面的抛光钢和带有轧机氧化皮的肋状表面），以比较它们的钝化能力。此外，将钢暴露于高碱性模拟混凝土孔隙溶液和低碱性饱和Ca（OH）₂溶液中10 d，以自发形成钝化膜。结果表明，表面条件对钢的钝化能力有显着影响，而钢种和碱溶液的钝化能力相对较弱。