卤素阴离子对离子液体缓蚀性能的影响

doi:10.11902/1005.4537.2021.218

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 791-797 DOI: 10.11902/1005.4537.2021.218

研究报告

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卤素阴离子对离子液体缓蚀性能的影响

冯丽¹^,²(

), 张胜涛³, 郑思远¹, 胡志勇¹, 朱海林¹, 马雪梅¹

^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

Effect of Halogen Anions on Corrosion Inhibition of Ionic Liquids

FENG Li¹^,²(

), ZHANG Shengtao³, ZHENG Siyuan¹, HU Zhiyong¹, ZHU Hailin¹, MA Xuemei¹

^1.School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China
^2.Dezhou Graduate School, North University of China, Dezhou 253034, China
^3.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China

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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 H₂SO₄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。

关键词 ：缓蚀剂, 离子液体, 硫酸, 电化学, X70钢, 形貌分析

Abstract：

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 H₂SO₄ 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 H₂SO₄ 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.

Key words： corrosion inhibitor Ionic liquid sulfuric acid electrochemistry X70 steel morphology analysis

收稿日期: 2021-08-30

ZTFLH:

TG174

基金资助:国家自然科学基金(201878029)

通讯作者: 冯丽 E-mail: 20200164@nuc.edu.cn

Corresponding author: FENG Li E-mail: 20200164@nuc.edu.cn

作者简介: 冯丽,女,1992年生,博士

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引用本文:

冯丽, 张胜涛, 郑思远, 胡志勇, 朱海林, 马雪梅. 卤素阴离子对离子液体缓蚀性能的影响[J]. 中国腐蚀与防护学报, 2022, 42(5): 791-797.
Li FENG, Shengtao ZHANG, Siyuan ZHENG, Zhiyong HU, Hailin ZHU, Xuemei MA. Effect of Halogen Anions on Corrosion Inhibition of Ionic Liquids. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 791-797.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.218 或 https://www.jcscp.org/CN/Y2022/V42/I5/791

图1 咪唑基离子液体缓蚀剂的化学结构

图2 拟合含和不含感抗阻抗数据所用的等效电路

图3 X70钢电极在不同浓度[VBIM]Cl、[VBIM]Br和[VBIM]I的0.5 mol/L H2SO4溶液中的Nyquist和Bode图

表1 X70钢电极在不同浓度[VBIM]Cl、[VBIM]Br和[VBI M]I的 0.5 mol/L H2SO4溶液中的电化学阻抗数据

图4 X70钢电极在含不同浓度[VBIM]Cl、[VBIM]Br和[VBIM]I的0.5 mol/L H2SO4溶液中的极化曲线图

表2 X70钢电极在含不同浓度[VBIM]Cl、[VBIM]Br和[VBIM]I的0.5 mol/L H2SO4溶液中的极化曲线参数

图5 X70钢电极在不含和含有 5 mmol/L [VBIM]Cl、[VBIM]Br和[VBIM]I的0.5 mol/L H2SO4溶液中浸泡4 h后的SEM形貌

图6 X70钢电极在不含和含有5 mmol/L [VBIM]Cl、[VBIM]Br和[VBIM]I的0.5 mol/L H2SO4溶液中浸泡4 h后的AFM形貌

图7 离子液体缓蚀机理示意图

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