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Citation: ZHANG Da-Quan, GAO Li-Xin, ZHOU Guo-Ding, LU Zhu. Corrosion Inhibition of Heterocyclic Compounds Containing Mercapto Group for Copper in HCl Solution[J]. Chinese Journal of Applied Chemistry, ;2002, 19(6): 535-538. shu

Corrosion Inhibition of Heterocyclic Compounds Containing Mercapto Group for Copper in HCl Solution

ZHANG Da-Quan ^a,, ,
GAO Li-Xin ^a ,
ZHOU Guo-Ding ^a ,
^a ,
LU Zhu ^b

1.
a Key Laboratory for Corrosion and Protection of Thermal Power Equipment under State Power Corporation, Shanghai Institute of Electric Power, Shanghai 200090;
2.
b Corrosion Prevention Center, East China University of Science and Technology, Shanghai

Corresponding author: ZHANG Da-Quan,
Received Date: 20 October 2001
Available Online: 8 January 2002
Fund Project: 国家自然科学基金(29876008) (29876008)上海市教委科技发展基金(2000-k-01)资助项目 (2000-k-01)

The corrosion inhibition action of benzotriazole(BTA), 2-mercapto benzoxazole(MBO) and 2-mercapto benzimidazole(MBI) for copper in 0.5 mol/L HCl solution was investigated by potentiodynamic polarization and impedance spectroscopy. Coupon tests showed that the best inhibition efficiency was 91.6% by using MBI in concentration of ca. 10^-3 mol/L. The molecular structure parameters of BTA, MBO and MBI were obtained via MM2 forcefield program and PPP-SCF quantum chemical calculation, which indicated that MBI has the higher HOMO and LUMO energy, as well as larger c electron density.
- corrosion inhibition,
- mercaptobenzoxazole,
- mercaptobenzimidazole,
- potentiodynamic polarization,
- impedance
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