研究了钢筋在混凝土试样和添加Ｃｌ＾－的混凝土试样中的电化学阻抗谱。发现钢筋的阻抗 谱特征随着时间及混凝土成份的不同而发生变化。当阻抗上出现扩散控制的直线段时，表示钢筋开始发生腐蚀。在混凝土试样中钢筋的阻抗谱与在模拟液中的有所不同，主要是在阻抗谱的高频处出现表示Ｃａ（ＯＨ）２沉积膜的容抗弧。
The EIS of rebars in concrete without chloride ion and with 0. 8mol/L chloride ion were measured. The effects of time and composition of concrete on the characteristics of EIS of rebars were studied. When a straight line, which meant diffusion control, appeared on the EIS, the rebar in concrecte began to corrode. The characteristics of EIS of rebars in concrete were different from those of rebars in simulated pore solutions. There were capaci- tive loops, which indicated the existence of sedimentary film of Ca(OH),, in high frequency range. The corresponding equivalent circuits were proposed respectively, which could inter- pret the corrosion mechanism of rebnrs in concrete.
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