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对混凝土内钢筋的阳极极化性能与其腐蚀状态的关系进行了研究。结果表明,钢筋阳极极化曲线中的维钝区间与钢筋表面的钝化状态有很好的相关性。当维钝区间大于280mV时,钢筋表面钝化状态保持良好;当维钝区间下降至250～280mV后,钢筋表面开始脱钝并出现部分锈蚀,即阳极极化曲线中250～280mV维钝区间为钢筋表面脱钝并开始锈蚀的节点。混凝土中钢筋表面的脱钝时间与其中氯离子含量具有较为密切的关系,试验中脱钝时间t与氯离子含量c的函数关系为t=-39.8ln(c)+84.4。
The relationship between the anode polarization and the corrosion status of rebars in concrete was studied. The results show that there is a good correlation between the dimension obliquity and the passive state on the surface of steel bars. When the dimension of ductility is greater than 280mV, the passivation of the surface of the steel bar remains good. When the ductile interval is reduced to 250 ~ 280mV, the surface of the bar begins to de-dull and partially rust, that is, the obtuse interval of 250 ~ 280mV in the anodic polarization curve is Reinforced surface blunted and started rusting nodes. The time of decarburization on the surface of rebar in concrete is closely related to the content of chloride ion in the concrete. The relation between the time t of decarburization and the content of chloride ion c in the test is t = -39.8ln (c) +84.4.