盐酸溶液中Tween-80和CTAB对Q235钢的缓蚀协同作用  

Synergistic Effect of Tween-80 and CTAB on Corrosion Inhibition of Q235 Steel in HCl Solution

作　　者：张银辉 王玮[1,2,3] 常洪莉[1,2,3] 宫敬 ZHANG Yin-hui;WANG Wei;CHANG Hong-li;GONG Jing(National Engineering Laboratory for Pipeline Safety,China University of Petroleum,Beijing 102249,China;MOE Key Laboratory of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)油气管道输送安全国家工程实验室,北京102249 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [3]中国石油大学(北京)城市油气输配技术北京市重点实验室,北京102249

出　　处：《表面技术》2018年第10期11-21,共11页Surface Technology

基　　金：国家自然科学基金(51422406;51534007;51274218);国家科技十三五重大专项(2016ZX05028-004-001;2016ZX05066005-001)~~

摘　　要：目的探究Tween-80(失水山梨醇单油酸酯聚氧乙烯醚)和CTAB(十六烷基三甲基溴化铵)共同存在于盐酸溶液中时,两者对钢材的缓蚀协同作用。方法采用失重法、极化曲线、阻抗谱、协同参数、SEM图和AFM图,对钢材腐蚀的电化学特征、Tween-80和CTAB的协同作用效果以及钢材腐蚀后的表面形貌进行探究。结果在各反应温度下,当不同浓度Tween-80与2?10^(-5) mol/L CTAB共同作用于1 mol/L盐酸溶液中时,腐蚀电流密度显著减小,电荷转移电阻显著增大。复配缓蚀剂属于混合型缓蚀剂,能够同时抑制阴极和阳极反应,其缓蚀效率随反应温度升高而下降。当反应温度为30、40、50℃时,复配缓蚀剂分别在Tween-80浓度为5?10^(-6)、2?10^(-5)、2?10^(-5) mol/L的条件下达到最佳缓蚀效果,最佳缓蚀效率分别为97.05%、94.00%和93.96%。SEM图和AFM图显示,钢材在含复配缓蚀剂的盐酸溶液中反应12 h后,表面平坦,平均粗糙度很小。结论Tween-80与CTAB以一定浓度共同存在于盐酸溶液中时,两者之间具有很好的协同作用。复配缓蚀剂能够显著提高缓蚀效率,有效地抑制钢材的腐蚀。The work aims to study synergistic effect of Tween-80 and CTAB coexisting in HCl solution on corrosion inhibition of steel.Electrochemical characteristics of steel corrosion,synergistic effect of Tween-80 and CTAB,and surface morphology of corroded steel were investigated by means of weight loss method,polarization curve,impedance spectroscopy,synergistic parameters,SEM and AFM images.At each reaction temperature,when different concentrations of Tween-80 and 2×10^-5 mol/L CTAB coexist in HCl solution,corrosion current density reduced significantly while charge transfer resistance increased significantly.The compounded inhibitor was a mixed-type inhibitor which could simultaneously inhibit anodic and cathodic reactions,and its inhibition efficiency decreased with the increase of temperature.At the reaction temperature of 30,40 and 50℃,the optimum inhibition effect could be achieved if the concentration of Tween-80 was 5×10-6,2×10^-5 and 2×10^-5 mol/L,respectively;and the optimum inhibition efficiency was 97.05%,94.00%and 93.96%,respectively.SEM and AFM images showed that the steel surfaces was flat and intact,and average roughness was small after 12 hours of reaction in HCl solution containing compounded inhibitor.Tween-80 and CTAB have good synergistic effect when they coexist at a certain concentration in HCl solution.The compounded inhibitor can significantly improve inhibition efficiency and effectively inhibit corrosion of steel.

关 键 词：TWEEN-80 CTAB 缓蚀剂 Q235钢 盐酸 

分 类 号：TG174.42[金属学及工艺—金属表面处理]