盐酸介质中Brönsted酸离子液体对Q235钢的缓蚀行为

doi:10.11902/1005.4537.2014.181

中国腐蚀与防护学报

2015, Vol. 35

Issue (5): 400-406 DOI: 10.11902/1005.4537.2014.181

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盐酸介质中Brönsted酸离子液体对Q235钢的缓蚀行为

李明丽^1,²,刘丹²,曹淑云²,彭坤¹,梁平³,史艳华³,桂建舟^1,²(

),刘峰³

2. 天津工业大学环境与化学工程学院天津 300387
3. 辽宁石油化工大学机械工程学院抚顺 113001

Corrosion Inhibition of Q235 Steel in HCl Solution by Brönsted Acid Ionic Liquid

Mingli LI^1,²,Dan LIU²,Shuyun CAO²,Kun PENG¹,Ping LIANG³,Yanhua SHI³,Jianzhou GUI^1,²(

),Feng LIU³

1. Division of Chemistry, Chemical Engineering and Environment, Liaoning Shihua University, Fushun 113001, China
2. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
3. College of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China

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摘要:

利用电化学方法研究了Brönsted酸离子液体1-甲基-3- (4-磺酸基丁基) 咪唑硫酸氢盐 ([(CH₂)₄SO₃HMIm][HSO₄]) 在0.5 mol/L HCl溶液中对Q235钢的缓蚀作用。结果表明：25 ℃下该酸性离子液体浓度在0~14 mmol/L时,缓蚀率随浓度增加而增加；浓度在14~16 mmol/L时,缓蚀率随浓度增加而减小；离子液体浓度在14 mmol/L时,缓蚀率可达80.7%。动电位极化曲线结果表明,该离子液体是一种混合型缓蚀剂。Q235钢表面腐蚀前后的SEM结果证实了该酸性离子液体在盐酸介质中有缓蚀能力。XPS分析表明,在Q235钢表面存在离子液体分子吸附形成的保护膜,抑制了析氢和Fe溶解反应。

关键词 ：缓蚀剂, 电化学方法, Brönsted酸离子液体, Q235钢

Abstract：

The inhibition effect of Brönsted acid ionic liquids (BAIL) 1-methyl-3-(4-sulfonic acid) butyl imidazolium hydrogen sulfate ([(CH₂)₄SO₃HMIm][HSO₄]) on the corrosion of Q235 steel in 0.5 mol/L HCl solution was investigated by electrochemical measurements. The results showed that the BAIL could suppress the corrosion process of Q235 steel in HCl solution at 25 ℃ through adsorption. The inhibition efficiency increased with the increasing concentration of BAIL in the range 0~14 mmol/L, but decreased with the increasing concentration of BAIL in the range 14~16 mmol/L. The best inhibition efficiency was 80.7% for the solution with 14 mmol/L BAIL. The potentiodynamic polarization curves revealed that the BAIL could act as a mixed-type inhibitor. SEM observation of Q235 surface showed that the adsorption of inhibitor molecules on Q235 surface could form a film of BAIL, and which could prevent both the hydrogen evolution and iron dissolution. This inhibition mechanism was proved further by the results of XPS analysis.

Key words： inhibitor electrochemical measurement Brönsted acid ionic liquid Q235 steel

ZTFLH:

基金资助:国家自然科学基金项目 (21576211),教育部新世纪优秀人才支持计划项目 (NCET-11-1011)及天津市应用基础与前沿技术研究项目 (13JCYBJC41600) 资助

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引用本文:

李明丽, 刘丹, 曹淑云, 彭坤, 梁平, 史艳华, 桂建舟, 刘峰. 盐酸介质中Brönsted酸离子液体对Q235钢的缓蚀行为[J]. 中国腐蚀与防护学报, 2015, 35(5): 400-406.
Mingli LI, Dan LIU, Shuyun CAO, Kun PENG, Ping LIANG, Yanhua SHI, Jianzhou GUI, Feng LIU. Corrosion Inhibition of Q235 Steel in HCl Solution by Brönsted Acid Ionic Liquid. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 400-406.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.181 或 https://www.jcscp.org/CN/Y2015/V35/I5/400

图1 IL的分子结构

图2 不同浓度IL溶液的Nyquist图

图3 拟合电化学阻抗谱所用等效电路

表1 Nyquist图拟合后得到的电化学参数

图4 Q235钢在不同浓度IL溶液中的动电位极化曲线

表2 动电位极化曲线中相关电化学参数

图5 Q235钢表面的SEM像

图6 Q235钢表面的XPS谱

图7 Q235钢表面各元素的XPS谱

图8 IL在Q235钢表面的缓蚀机理

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