Intramolecular synergistic effect of glutamic acid, cysteine and glycine against copper corrosion in hydrochloric acid solution |
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Authors: | Da-Quan Zhang Bin XieLi-Xin Gao Qi-Rui CaiHyung Goun Joo Kang Yong Lee |
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Affiliation: | a Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, PR Chinab Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, Seoul 120-749, Republic of Korea |
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Abstract: | The corrosion protection of copper by glutamic acid, cysteine, glycine and their derivative (glutathione) in 0.5 M hydrochloric acid solution has been studied by the electrochemical impedance spectroscopy and cyclic voltammetry. The inhibition efficiency of the organic inhibitors on copper corrosion increases in the order: glutathione > cysteine > cysteine + glutamic acid + glycine > glutamic acid > glycine. Maximum inhibition efficiency for cysteine reaches about 92.9% at 15 mM concentration level. The glutathione can give 96.4% inhibition efficiency at a concentration of 10 mM. The molecular structure parameters were obtained by PM3 (Parametric Method 3) semi-empirical calculation. The intramolecular synergistic effect of glutamic acid, cysteine and glycine moieties in glutathione is attributed to the lower energy of the lowest unoccupied molecular orbital (ELUMO) level and to the excess hetero-atom adsorption centers and the bigger coverage on the copper surface. |
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Keywords: | Corrosion inhibitor Amino acid Glutathione Copper Synergistic effect Electrochemical impedance spectroscopy |
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