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使用干湿交替方法模拟酸雨大气腐蚀条件,并利用电化学阻抗谱(EIS)技术对腐蚀过程进行实时监测,对低碳钢Q235在模拟酸雨大气环境下的腐蚀行为进行研究,着重探讨阴极还原反应的演化特征.结果表明,低碳钢Q235的阴极反应为氧的还原反应和锈层(腐蚀产物)的还原反应并行.随着干湿交替循环次数的增加,氧还原反应的活性逐渐减弱,最后几乎完全消失;而锈层还原反应的活性逐渐增虽,并取代氧还原反应成为主要的阴极反应.在同一个干湿交替周期内,腐蚀速率随着液膜厚度的减小呈现先增加,然后迅速降低的规律,这是由于液膜厚度对腐蚀反应同时存在2种效果相反的作用所致.
Alternate dry-wet method was used to simulate the condition of acid rain and the corrosion process was monitored by electrochemical impedance spectroscopy (EIS) in real time. The corrosion behavior of mild steel Q235 under simulated acid rain was studied. The effects of cathodic reduction The results showed that the cathode reaction of Q235 in low carbon steel was parallel to the reduction reaction of oxygen and the reduction reaction of rust layer (corrosion product), and the activity of oxygen reduction reaction gradually weakened with the increase of the number of wetting and drying cycles. Almost completely disappeared, while the rust reduction reaction gradually increased, and replace the oxygen reduction reaction as the main cathode reaction in the same wet-dry alternating period, the corrosion rate decreases with the thickness of the liquid film first increased, and then The law of rapid decrease is due to the opposite effect of the two effects of the film thickness on the corrosion reaction.