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利用交流阻抗和动电位极化技术，在碱性硫化物溶液中，分别研究了阳极极化电位下Ｃｌ~对低碳钢钝化过程阻抗行为的影响，钝化膜临界孔蚀电位Ｅｂ与Ｃｌ浓度的关系以及临界ＣＩ~浓度随温度的变化．结果表明，在除氧的碱性硫化物溶液中，阳极极化的初期阻抗具有两个时间常数，随极化电位的升高，钝化膜逐步趋于完整；在点蚀的形成过程中，容抗弧半径逐渐变小，当极化电位为－６００ｍＶ时容抗弧半径大幅度下降，并出现低频实部电感性收缩现象；在点蚀形成后的发展阶段，容抗弧半径继续减小，阻抗谱出现两个时间常数的双容抗弧．极化研究结果表明，不同温度下，随介质Ｃｌ~浓度增加，电极表面的钝化倾向降低，临界孔蚀电位随Ｃｌ~浓度增加而线性正移．
The effect of Cl ~ on the impedance behavior of low carbon steel during passivation process was investigated in alkaline sulfide solution using AC impedance and potentiodynamic polarization respectively. The critical pitting potentials of passive film Eb and Cl The relationship between the concentration and the critical CI ~ concentration with temperature changes. The results show that the initial impedance of anodic polarization has two time constants in the deoxygenated alkaline sulfide solution, and the passivation film gradually becomes more complete with the increase of the polarization potential. During the formation of pitting corrosion, When the polarization potential is -600mV, the arc radius of capacitive reactance decreases sharply and inductive shrinkage of low frequency real part occurs. During the development stage after the formation of pitting corrosion, the arc radius of capacitive reactance continues to decrease , The impedance spectrum appears double capacitance arc of two time constants. The results of polarization studies show that the passivation tendency of the electrode surface decreases with the increase of Cl ~ concentration at different temperatures, and the critical pitting potential moves linearly with the increase of Cl ~ concentration.