Effect of Blends of Benzotriazole and Thiourea on the Anodic Dissolution of Copper

The blending of benzotriazole (BTAH) and thiourea (TU) was shown to exert synergistic or antagonistic effects on the anodic dissolution of copper at pH ≈ 1.8 depending on their concentrations in the blend. While synergism was observed in blends with low concentrations of TU and BTAH, antagonism was...

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Bibliographic Details
Published in:Adsorption science & technology 2002-06, Vol.20 (5), p.485-494
Main Authors: Ashour, E.A., Hegazy, H.S., Ateya, B.G.
Format: Article
Language:English
Subjects:
Adsorption
ANODES
Anodic dissolution
Benzotriazole
Blends
Chemistry
Copper
DISSOLUTION
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
Polymer blends
Surface chemistry
THIOUREA
Thioureas
TRIAZOLE
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Summary:The blending of benzotriazole (BTAH) and thiourea (TU) was shown to exert synergistic or antagonistic effects on the anodic dissolution of copper at pH ≈ 1.8 depending on their concentrations in the blend. While synergism was observed in blends with low concentrations of TU and BTAH, antagonism was observed in blends containing higher, i.e. ≥ 10−2 M, concentrations of TU to an extent which increased with the concentration of TU. The antagonistic effect of TU was discussed in the light of its tendency to produce hydrogen sulphide which promotes the anodic dissolution of copper. Analysis of the adsorption behaviour of the individual compounds using the Langmuir isotherm revealed stronger interaction of the copper surface with BTAH than with TU, as judged by free energy of adsorption values of −18.8 and −8.7 kJ/mol for BTAH and TU, respectively.
ISSN:0263-6174
2048-4038
DOI:10.1260/026361702320644761