期刊
THIN SOLID FILMS
卷 520, 期 1, 页码 356-361出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.07.009
关键词
Corrosion inhibitor; Amino acid; Glutathione; Copper; Synergistic effect; Electrochemical impedance spectroscopy
类别
资金
- NSFC [20776083, 20911140272]
- Program for New Century Excellent Talents in China University [NET-08-089]
- National Research Foundation of Korea (NRF) [F01-2009-000-10090-0]
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 (E(LUMO)) level and to the excess hetero-atom adsorption centers and the bigger coverage on the copper surface. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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