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采用电化学阻抗方法,研究了在紫外光辐照下带锈层碳钢的腐蚀电化学行为,探究了紫外光所致的锈层光电催化效应及其对碳钢腐蚀的影响。结果表明,紫外光辐照能引发锈层光电催化反应,促使电极的腐蚀加速;锈层由γ-FeOOH外锈层和Fe2O3与Fe3O4内锈层组成,但它们在光电催化中的作用仍待研究。长期腐蚀过程的电化学阻抗谱图表明,带锈低碳钢电极的腐蚀比裸电极的大,随时间延长锈层逐步增厚引起光电催化效应强度增大,促进基体电极腐蚀程度增加;锈层积累42 d达到一定厚度时,随时间延长锈层促进基体电极腐蚀程度减缓,引起光电催化效应的强度会趋于一个稳定值。
Electrochemical impedance spectroscopy (EIS) was used to study the electrochemical corrosion behavior of carbon steel with rust layer under ultraviolet light irradiation. The electro-catalytic effect of rust layer caused by ultraviolet light and its influence on the corrosion of carbon steel were investigated. The results show that the ultraviolet radiation can cause the photoelectrocatalytic reaction of the rust layer to accelerate the corrosion of the electrode. The rust layer is composed of the outer rust layer of γ-FeOOH and the inner rust layer of Fe2O3 and Fe3O4. However, their role in photoelectrocatalysis remains to be studied . The electrochemical impedance spectroscopy of the long-term corrosion process shows that the corrosion of the mild steel with rust is larger than that of the bare electrode. With the prolongation of the rust layer, the thickening of the rust layer increases the intensity of the photo-catalysis and increases the corrosion of the matrix electrode. When the deposition reaches a certain thickness for 42 days, the corrosion of the corrosion layer on the substrate decreases with the passage of time and the intensity of the photo-catalysis effect tends to be stable.