氯化氢隔膜泵膜片电化学腐蚀行为研究  

Research on electrochemical corrosion behavior of diaphragm in hydrogen chloride diaphragm pump

作　　者：蔡丰义 陈英华[1,2] 李海生[1,2] 陈聚凯 张敬亮 张勋 张政 CAI Fengyi;CHEN Yinghua;LI Haisheng;CHEN Jukai;ZHANG Jingliang;ZHANG Xun;ZHANG Zheng(School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Zhongneng Silicon Industry Technology Development Co.,Ltd.,Xuzhou 221000,China)

机构地区：[1]中国矿业大学化工学院,江苏徐州221116 [2]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室,江苏徐州221116 [3]江苏中能硅业科技发展有限公司,江苏徐州221000

出　　处：《流体机械》2025年第2期1-7,32,共8页Fluid Machinery

基　　金：国家自然科学基金项目(52206215)。

摘　　要：为了研究氯化氢隔膜泵膜片在高氯、高温氯化氢环境中的电化学腐蚀行为,采用Tafel极化法和电化学阻抗法(EIS)分析膜片的耐蚀性能,并利用SEM,EDS,XPS测试方法,对不同工况下的膜片腐蚀样品进行分析。结果表明,301L不锈钢膜片在HCl环境中腐蚀严重,极化曲线均没有稳定的钝化区,随着溶液浓度及温度的提升,自腐蚀电流密度增大,耐蚀性能下降;不锈钢膜片对温度表现出较高的敏感性,90 ℃ HCl溶液环境下的电荷转移电阻为3.682,仅为50 ℃时的6.7%,腐蚀电流密度为1.258×10^(-2) A/cm^(2),是50 ℃时的3.94倍,离子扩散速率加快;Cl^(-)的竞争吸附使腐蚀产物中的氧化物难以维持稳定,表面难以形成钝化膜,容易导致不锈钢点蚀的发生。研究结果可为隔膜泵膜片耐腐蚀研究和设计提供依据和参考。In order to investigate the electrochemical corrosion behavior of hydrogen chloride diaphragm pump membranes in high-chloride and high-temperature hydrogen chloride environments,Tafel polarization method and Electrochemical Impedance Spectroscopy(EIS)were employed to analyze the corrosion resistance of the membranes.The corrosion samples of the membranes under different operating conditions were analyzed by SEM,EDS,and XPS testing methods.The results indicate that 301L stainless steel membranes suffer severe corrosion in hydrogen chloride environments,with no stable passivation region observed in the polarization curves.With increasing solution concentration and temperature,the self-corrosion current density increases,leading to a decrease in corrosion resistance.The stainless steel membranes exhibit high sensitivity to temperature.The charge transfer resistance in a 90℃HCl solution environment is 3.682,which is only 6.7%of that at 50℃.The corrosion current density is 1.258×10^(-2) A/cm^(2),which is 3.94 times that at 50℃,and the ion diffusion rate accelerates.Competition for Cl^(-)adsorption makes it difficult for oxides in the corrosion products to maintain stability,hindering the formation of a passive film on the surface,thus leading to the occurrence of pitting corrosion in stainless steel.These findings provide a basis and reference for the study and design of corrosion-resistant membranes for diaphragm pumps.

关 键 词：隔膜泵 膜片 HCL溶液 电化学腐蚀 腐蚀行为 

分 类 号：TH323[机械工程—机械制造及自动化] TG174.3[金属学及工艺—金属表面处理]