物理化学学报2011，Vol.27Issue(3)：655-663,9.
咪唑离子液体对铜在硫酸溶液中的缓蚀作用
Effect of Alkylimidazolium Ionic Liquids on the Corrosion Inhibition of Copper in Sulfuric Acid Solution
摘要
Abstract
The effects of three newly synthesized alkylimidazolium based ionic liquids: 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIMJHSO4), 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.关键词
缓蚀剂/咪唑离子液体/铜/动电位极化/电化学阻抗谱Key words
Corrosion inhibitor/Alkylimidazolium ionic liquid/Copper/Potentiodynamic polarization/Electrochemical impedance spectroscopy分类
化学化工引用本文复制引用
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(3):655-663,9.基金项目
The project was supported by the National Natural Science Foundation of China (50864009,50904031) and Research Fund for the Doctoral Program of Higher Education of China (20070674001) （50864009,50904031）
国家自然科学基金(50864009,50904031)及高等学校博士学科点专项科研基金(20070674001)资助项目 （50864009,50904031）
