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中文摘要：
应用极化曲线法和电化学阻抗技术,结合扫描电子显微镜方法,测试钢筋在模拟混凝土孔隙液中的钝化与去钝化行为,以及溶液pH值对钢筋电化学腐蚀行为的影响作用。结果表明,钢筋在pH值为12.50的模拟液中处于钝态,随着溶液pH值的降低,钢筋的耐蚀性下降。钢筋表面去钝化发生腐蚀的临界pH值在11.12～11.05范围内。
英文摘要：
The passivation and depassivation behavior of reinforcing steel in simulated concrete pore solutions（SPS） with different pH values was studied by the polarization curves,electrochemical impedance spectroscopy and scanning electron microscopy.The results indicated that reinforcing steel was in the passive state in the simulated concrete pore solution with pH 12.50.The lower the pH value of solutions,the more unstable the passive film of reinforcing steel.The critical pH value for the localized corrosion of the reinforcing steel in the simulated concrete pore solutions was between 11.12 and 11.05 based on the electrochemical measurements.
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