咪唑离子液体对铜在硫酸溶液中的缓蚀作用

引用本文: 张启波, 华一新. 咪唑离子液体对铜在硫酸溶液中的缓蚀作用[J]. 物理化学学报, 2011, 27(03): 655-663. doi: 10.3866/PKU.WHXB20110339 shu

Citation: ZHANG Qi-Bo, HUA Yi-Xin. Effect of Alkylimidazolium Ionic Liquids on the Corrosion Inhibition of Copper in Sulfuric Acid Solution[J]. Acta Physico-Chimica Sinica, 2011, 27(03): 655-663. doi: 10.3866/PKU.WHXB20110339 shu

咪唑离子液体对铜在硫酸溶液中的缓蚀作用

张启波 ,
华一新

基金项目:
国家自然科学基金(50864009, 50904031) (50864009, 50904031)

高等学校博士学科点专项科研基金(20070674001)资助项目 (20070674001)

摘要:

采用动电位极化和电化学阻抗谱技术研究了三种新型烷基咪唑离子液体, 1-丁基-3-甲基咪唑硫酸氢盐([BMIM]HSO₄), 1-已基-3-甲基咪唑硫酸氢盐([HMIM]HSO₄), 1-辛基-3-甲基咪唑硫酸氢盐([OMIM]HSO₄), 对铜在0.5 mol·L_-1 H₂SO₄溶液中的缓蚀作用. 实验结果表明: 咪唑离子液体能有效抑制铜在硫酸溶液中的腐蚀, 相同浓度下的缓蚀效率大小顺序为[OMIM]HSO₄>[HMIM]HSO₄>[BMIM]HSO₄. 动电位极化表明三种咪唑化合物的加入对铜的阴阳极腐蚀过程均有抑制作用, 属于混合型缓蚀剂. 电化学阻抗谱用带两个常相位原件的等效电路对含两个时间常数的体系进行拟合, 发现咪唑化合物的添加会引起电荷传递电阻和双电层电容等阻抗参数的变化, 表明此类化合物通过吸附于铜电极与溶液界面起到缓蚀作用, 且这种吸附符合Langmuir吸附等温关系. 吸附过程热力学计算说明咪唑化合物在铜表面发生了自发的物理吸附.

关键词:

English

Effect of Alkylimidazolium Ionic Liquids on the Corrosion Inhibition of Copper in Sulfuric Acid Solution

ZHANG Qi-Bo ,
HUA Yi-Xin

1.
Key Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
Received Date: 20 October 2010
Available Online: 03 March 2011
Fund Project:
国家自然科学基金(50864009, 50904031)

高等学校博士学科点专项科研基金(20070674001)资助项目

Abstract:

The effects of three newly synthesized alkylimidazolium based ionic liquids: 1-butyl-3- methylimidazolium hydrogen sulfate ([BMIM]HSO₄), 1-hexyl-3-methylimidazolium hydrogen sulfate ([HMIM]HSO₄), and 1-octyl-3-methylimidazolium hydrogen sulfate ([OMIM]HSO₄), on the corrosion inhibition of copper in 0.5 mol·L_-1 H₂SO₄ solution were investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. All the measurements show that these alkylimidazolium ionic liquids are excellent inhibitors for copper in sulfuric acid media and the effectiveness of these inhibitors decreases as follows: [OMIM]HSO₄>[HMIM]HSO₄>[BMIM]HSO₄ at the same concentration. Potentiodynamic polarization studies indicate that the three inhibitors are mixed type inhibitors and that both the cathodic and anodic processes of copper corrosion are suppressed. The electrochemical impedance results were evaluated using an equivalent circuit in which two constant phase elements (CPE) were offered for these systems with two time constants. Changes in impedance parameters (charge transfer resistance and double layer capacitance) with the addition of the inhibitors also suggest that these imidazolium based molecules act by adsorbing at the copper/solution interface. The adsorption of these imidazolium based compounds on the copper surface in an acidic solution is found to fit the Langmuir adsorption isotherm. Thermodynamic calculations reveal that the adsorption of inhibitors on the metal surface occurs by a physisorption-based mechanism involving a spontaneous process.

Key words:

Corrosion inhibitor
/ Alkylimidazolium ionic liquid
/ Copper
/ Potentiodynamic polarization
/ Electrochemical impedance spectroscopy

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沈阳化工大学材料科学与工程学院沈阳 110142

咪唑离子液体对铜在硫酸溶液中的缓蚀作用

English

Effect of Alkylimidazolium Ionic Liquids on the Corrosion Inhibition of Copper in Sulfuric Acid Solution

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

咪唑离子液体对铜在硫酸溶液中的缓蚀作用

English

Effect of Alkylimidazolium Ionic Liquids on the Corrosion Inhibition of Copper in Sulfuric Acid Solution

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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