酸性环丁砜溶液对Q235B碳钢腐蚀行为的影响  

Effect of acidic sulfolane solution on corrosion behavior of Q235B carbon steel

作　　者：孙明道 李俊俊 闫涛 宋文静 秦峰 SUN Mingdao;LI Junjun;YAN Tao;SONG Wenjing;QIN Feng(Henan Boiler and Pressure Vessel Inspection Technology Research Institute,Zhengzhou 450016,China)

机构地区：[1]河南省锅炉压力容器检验技术科学研究院,河南郑州450016

出　　处：《物理测试》2025年第1期1-5,共5页Physics Examination and Testing

基　　金：河南省基本科研业务费支撑项目(2022KY04)。

摘　　要：采用静态挂片法、电化学阻抗谱、动电位极化曲线方法,主要研究了30℃和50℃两种典型环境温度下储罐材料Q235B碳钢在酸性环丁砜溶液中的腐蚀行为。结果表明:50℃时腐蚀速率快,约为30℃腐蚀速率的近3倍。通过电化学试验可知,Nyquist曲线显示在高频区出现不完整容抗弧,50℃时高频区容抗弧半径较小,由于温度高时环丁砜发生劣化的活化度更大,溶液内部离子受到阻力变小,腐蚀加剧,这与静态挂片法的结果一致。随着浸泡时间的延长,Q235B碳钢在酸性环丁砜溶液浸泡过程中产生的腐蚀产物未对基体起到保护作用,自腐蚀电位负移,极化电阻变小,耐蚀性逐渐降低。The corrosion behavior of Q235B carbon steel for tank in acidic sulfolane solution at two typical temperatures,i.e.,30℃and 50℃,was investigated and analyzed by static coupon method,electrochemical impedance spectroscopy and potentiodynamic polarization curve method.The results showed that the corrosion rate was fast at 50℃,which was nearly three times of that at 30℃.The electrochemical experiments indicated that Nyquist curve showed incomplete capacitive arc in the high-frequency region,and the radius of capacitive arc in the high-frequency region was small at 50℃.Due to the greater activation degree of sulfolane degradation at high temperature,the resistance of ions in the solution became smaller,leading to the aggravated corrosion,which was consistent with the result of static coupon method.With the extension of immersion time,the corrosion products of Q235B carbon steel during the immersion in acidic sulfolane solution had no protecting effect on the matrix.The self-corrosion potential shifted negatively,the polarization resistance decreased,and the corrosion resistance gradually decreased.

关 键 词：酸性环丁砜 Q235B 腐蚀 电化学 碳钢 

分 类 号：TQ050.9[化学工程]