盐酸介质中咪唑离子液体对铜的缓蚀作用

以1-甲基咪唑、1,4-丁烷磺内酯和浓硫酸为原料,用乙醚洗涤合成了1-甲基-3-(4-硫酸基丁基)咪唑硫酸盐(4-BMIM)缓蚀剂。采用动电位极化和交流阻抗技术研究了4-BMIM在5%HCl溶液中对铜的缓蚀性能及作用机理。实验结果表明:缓蚀效率随着缓蚀剂浓度的增加先增大后降低,当浓度为0.03mol/L时,缓蚀效率最高;同一浓度下,随着温度的升高缓蚀效率降低。动电位极化表明咪唑离子的加入对铜的阴、阳极腐蚀过程均有抑制作用,是混合型缓蚀剂。热力学计算结果表明咪唑离子液体吸附在铜表面,其吸附机制为自发进行的物理吸附,并且在铜/溶液界面的吸附遵循Langmuir吸附等温式。

Corrosion Inhibitor of Imidazolium Ionic Liquid on Copper in HCI Solution

1 methy 3 (4vsulfate butyl) imidazolium ionic liquid was synthetized using 1-methylimidazole,1,4-butane sultone,concentrated sulfuric acid by being washed with ether.The potentiodynamic polarization and electrochemical impedance spectroscopy were used to study the corrosion mechanism and inhibiting performance of 4-BMIM on copper in 5％ hydrochloric acid medium.The results show that the inhibition efficiency first increases and then decreases with the increase of inhibition concentration,and the maximum inhibition efficiency is obtained with 0.03mol/L 4-BMIM.However,the inhibition efficiency decreases with the increase of temperature at the same concentration.The polarization curves show that 4-BMIM is a mixed type inhibitor,and inhibits both the cathodic and anodic reactions.The results of thermodynamic calculation reveal that adsorption mechanism of 4-BMIM on the copper surface is spontaneous physisorption and it fits the Langmuir adsorption isotherm.