Undecyl substitution in imidazole and its action on corrosion inhibition of copper in aerated acidic chloride media |
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| Authors: | Da-quan Zhang Li-xin Gao Guo-ding Zhou Kang Yong Lee |
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| Affiliation: | (1) Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai, 200090, P.R. China;(2) Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, Seoul, 120-749, Republic of Korea |
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| Abstract: | Inhibition of copper corrosion by imidazole (IM) and 1-n-undecyl-imidazole (UDIM) in 0.5 M HCl was investigated by weight-loss
measurements, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). 1-n-undecyl-imidazole
showed the better inhibitive effect compared with IM. Potentiodynamic polarization results revealed that both IM and UDIM
acted as anodic inhibitors, in particular UDIM suppressed anodic current densities significantly. Molecular structure parameters
of IM and UDIM were obtained by using an MM2 forcefield program and AM1 quantum chemical calculation. It was found that UDIM
has higher levels of HOMO and LUMO energy and a larger electron density in its imidazoly ring.
Presented as paper No.13-07 at 14th APCC conference, October 2006, Shanghai, China |
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| Keywords: | Copper Acid corrosion Weight loss EIS Polarization |
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