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研究了钝化的20号碳钢电极在受到溶液中的CI~-的作用而尚未生成腐蚀孔时(孔蚀诱导期内)的阻抗频谱特征。发现极化电阻比之没有Cl~-时降低了4个数量级,而且低频区阻抗实部呈现电感性收缩现象。这种实部收缩现象随着时间的增加逐渐减弱。对于表面复盖有钝化膜的金属电极的交流阻抗提出了一个统一的数学模型,可以解释溶液中没有Cl~-时和受到Cl~-影响时的钝态金属电极的阻抗频谱。
The impedance spectroscopy characteristics of the passivated 20 # carbon steel electrode subjected to CI ~ - in solution and no corrosion hole has been formed were investigated. It was found that the polarization resistance was reduced by 4 orders of magnitude compared with no Cl ~ -, and the real part of the impedance in the low frequency region showed an inductive contraction phenomenon. This real part shrinks gradually diminish over time. A uniform mathematical model is proposed for the AC impedance of a metal electrode covered with a passivation film, which can explain the impedance spectrum of the passive metal electrode in the absence of Cl ~ - and in the presence of Cl ~ -.