35钢在城市交通工程中应用越来越多,酸雨对其腐蚀严重,过去对其研究不多.为此,配制了模拟酸雨溶液,研究了35钢在模拟酸雨溶液中的腐蚀行为,探讨了酸雨酸度和浸泡时间对35钢腐蚀行为的影响.采用极化曲线、电化学交流阻抗(EIS)及扫描电镜(SEM)方法对35钢的腐蚀进行了测试分析.结果表明:随着模拟酸雨溶液pH值的降低,35钢的腐蚀电流逐渐增大,腐蚀速率增大,腐蚀电位负移;随着浸泡周期的延长,阻抗谱中锈层阻抗增大,腐蚀速率降低,表面生成的腐蚀锈层对基体起到一定的保护作用.SEM和EDS分析表明,35钢在低pH值的酸雨中腐蚀严重,表面蚀坑密集且深,腐蚀产物粗大疏松,致密性差,为硫酸盐,而pH值升高时腐蚀相对较轻,蚀坑较小.
The corrosion behavior of 35 steel in simulated acid rain was evaluated. The effects of the acidity and immersion time on its corrosion behavior were investigated by measuring the polarization curves and electrochemical impedance spectrum and observing with a scanning electron microscope. It was found that the corrosion current and corrosion rate of 35 steel increased with decreasing pH value of simulated acid rain, correspondingly the corrosion potential of 35 steel became negative. At the same time, the impedance of rust was increased and corrosion rate was lowered with increasing immersion time, indicating that the corrosion rust was able to protect the steel substrate to some extent. Moreover,35 steel was heavily corroded in simulated acid rain of a lower pH value, dominated by numerous deep corrosion pits and thick and porous corrosion products, while it experienced mild corrosion in simulated acid rain of a higher pH value.
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