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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CaCO_3或含钙氧化物CaFe_2O_4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.
The influence of the pH value of the solution in the simulated concrete pore after carbonation on the electrochemical corrosion behavior of the reinforcement was studied by means of electrochemical impedance spectroscopy, cyclic voltammetry and potentiodynamic polarization. The results showed that with the decrease of pH, The stability and corrosion resistance of the films decreased to some extent.When the pH value of the simulated solution was 12.5 and 11.5, the stability of the passivation film was attributed to the dissolution of the passive film and the precipitation of CaCO_3 or Ca CaFe_2O_4 and other corrosion-resistant effect of the dynamic equilibrium process.When the pH value continues to decline (pH = 10.5, 10.0), the passive film gradually destabilized destruction, uniform activation corrosion appears.