卤素阴离子对离子液体缓蚀性能的影响  

Effect of Halogen Anions on Corrosion Inhibition of Ionic Liquids

作　　者：冯丽 张胜涛[3] 郑思远 胡志勇 朱海林 马雪梅 FENG Li;ZHANG Shengtao;ZHENG Siyuan;HU Zhiyong;ZHU Hailin;MA Xuemei(School of Chemical Engineering and Technology,North University of China,Taiyuan 030051,China;Dezhou Graduate School,North University of China,Dezhou 253034,China;School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331,China)

机构地区：[1]中北大学化学工程与技术学院,太原030051 [2]中北大学德州研究生分院,德州253034 [3]重庆大学化学化工学院,重庆401331

出　　处：《中国腐蚀与防护学报》2022年第5期791-797,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(201878029)。

摘　　要：通过电化学阻抗谱、极化曲线、扫描电镜和原子力显微镜等测试对比了不同卤素阴离子的咪唑基离子液体对X70钢在0.5 mol/L H_(2)SO_(4)溶液中的缓蚀性能。结果表明,它们都属于混合型缓蚀剂,均可以有效地抑制X70钢的腐蚀;且随着缓蚀剂浓度的增大,缓蚀效率逐渐增大;在浓度为5 mmol/L时,缓蚀效率达到最大。1-乙烯基-3-丁基咪唑碘盐([VBIM]I)的缓蚀效率最高,其次为1-乙烯基-3-丁基咪唑氯盐([VBIM]Cl),而1-乙烯基-3-丁基咪唑溴盐([VBIM]Br)的最低,这主要归因于I-的特异性吸附。所研究离子液体缓蚀剂的阴离子和阳离子之间存在协同缓蚀作用,即离子液体的阴离子和阳离子都参与了对金属的缓蚀。The corrosion inhibition performance of imidazolidyl ionic liquids with different halogen anions(such as 1-vinyl-3-butyl-imidazolium chloride salt,[VBIM]Cl,1-vinyl-3-butylimidazolium bromide,[VBIM]Br,and 1-vinyl-3-butylimidazolium iodide,[VBIM]I)on X70 steel in 0.5 mol/L H_(2)SO_(4) solution was comparatively assessed by electrochemical impedance spectroscopy,polarization curve measurement,scanning electron microscopy and atomic force microscopy.The results indicated that they were all the mixed corrosion inhibitor and could effectively inhibit the corrosion of X70 steel in 0.5 mol/L H_(2)SO_(4) solution.With the increase of the concentration of corrosion inhibitors,the corrosion inhibition efficiency increases gradually.And the inhibition efficiency reached the maximum by the concentration of 5 mmol/L.The corrosion inhibition efficiency of the inhibitors may be ranked as the follows:[VBIM]I is higher than[VBIM]Cl and[VBIM]Br in turn,which is mainly due to the specific adsorption of I-.The inhibition mechanism may be described as that there is a synergistic inhibition effect between the cation and anion of the studied ionic liquid corrosion inhibitors.In other words,both the anions and cations of ionic liquid can participate in the corrosion inhibition process of metal.

关 键 词：缓蚀剂 离子液体 硫酸 电化学 X70钢 形貌分析 

分 类 号：TG174[金属学及工艺—金属表面处理]