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采用循环干/湿模拟腐蚀增重实验、动电位极化曲线、电化学阻抗谱和XRD方法,研究了模拟海岸-工业大气中SO2对Q235B钢腐蚀行为的影响.结果表明,在腐蚀初期SO2抑制了Q235B钢的腐蚀;在腐蚀后期,SO2促进了Q235B钢的腐蚀.当SO2的浓度较低时,腐蚀速率随SO2浓度的升高而增大;当SO2的浓度较高时,腐蚀速率随SO2浓度的升高而减小.工业-海岸大气中的SO2组分可以抑制腐蚀产物中g-FeOOH和b-FeOOH的生成,而促进a-FeOOH生成.低碳钢腐蚀速率随SO2浓度变化出现的极值现象与SO2导致的锈层相组分变化密切相关.
The effects of SO2 in the simulated coastal-industrial atmosphere on the corrosion behavior of Q235B steel were investigated by cyclic dry / wet simulated corrosion weight gain test, potentiodynamic polarization curve, electrochemical impedance spectroscopy and XRD methods. The results showed that SO2 inhibition The corrosion rate of Q235B steel increased with the increase of SO2 concentration. When the concentration of SO2 was higher, the corrosion rate of Q235B steel increased with the increase of SO2 concentration Concentration of SO2 in the industrial-coastal atmosphere can inhibit the formation of g-FeOOH and b-FeOOH in the corrosion products and promote the formation of a-FeOOH.The corrosion rate of low carbon steel changes with the concentration of SO2 The extreme phenomenon is closely related to the change of phase composition of rust layer caused by SO2.