应用电化学阻抗谱、循环伏安与动电位极化等方法研究了碳化后模拟混凝土孔溶液pH值的变化对钢筋腐蚀电化学行为的影响.结果表明,随着pH值的下降钢筋表面钝化膜的稳定性与耐蚀性不同程度地降低.当模拟液pH值为12.5与11.5时,钝化膜的稳定性处于因pH值降低导致的钝化膜溶解与表面沉积物CaCO3或含钙氧化物CaFe2O4等耐蚀效应的动态平衡过程.当pH值继续下降(pH=10.5,10.0)时,钝化膜逐渐失稳破坏,均匀的活化腐蚀出现.
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