Traditional electrochemical tests and the contact electrical resistance technique (CER) were used to investigate the effect on corrosion of pure copper (99.999 wt%) of adding benzotriazole (BTA) and 1-hydroxybenzotriazole (1-OH-BTA) to acidic solutions (sulfuric acid [H2SO4], pH = 1.7, and sodium sulfate [Na2SO4] until total sulfate [SO42–] concentration = 0.1 M). This technique permitted growth of oxide and/or salt films as well as adsorption of the organic inhibitors on the copper surface to be evaluated. Formation of copper oxide ([Cu2O]2), sulfate (CuSO4·5H2O), thiocyanate (CuSCN), and halogenyde (CuI, CuBr, and CuCl) films on copper electrodes was followed in situ in sulfate solutions at various pH values under low overpotentials. Effects of pH, solution anion content, and/or the amount of BTA or 1-OH-BTA on electrical resistance (R) of the surface films formed on pure copper electrodes were treated. BTA acted as a more efficient corrosion inhibitor than 1-OH-BTA, reaching inhibition percentages (IP) of ~ 90% compared to those of 1-OH-BTA, which reached a maximum of ~ 76% in 2 x 10–3 M solutions. It was possible to distinguish between maximum R of the surface film, found in solutions containing BTA, associated with the adsorption of neutral inhibitor molecules, and the sharp rise in R attributable to [Cu(BTA)]n complex formation.
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1 February 1998
Research Article|
February 01 1998
In-Situ Contact Electrical Resistance Technique for Investigating Corrosion Inhibitor Adsorption on Copper Electrodes Available to Purchase
G. Moretti;
G. Moretti
*University of Venice, Department of Chemistry, S. Marta D.D. 2137-I-30123, Venice,
Italy
.
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V.V. Molokanov;
V.V. Molokanov
**Institute of Physical Chemistry, Russian Academy of Sciences, Leninsky Prospect 31, Moscow, 117071,
Russia
.
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G. Quartarone;
G. Quartarone
*University of Venice, Department of Chemistry, S. Marta D.D. 2137-I-30123, Venice,
Italy
.
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A. Zingales
A. Zingales
*University of Venice, Department of Chemistry, S. Marta D.D. 2137-I-30123, Venice,
Italy
.
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
1998
CORROSION (1998) 54 (2): 135–144.
Citation
G. Moretti, V.V. Molokanov, G. Quartarone, A. Zingales; In-Situ Contact Electrical Resistance Technique for Investigating Corrosion Inhibitor Adsorption on Copper Electrodes. CORROSION 1 February 1998; 54 (2): 135–144. https://doi.org/10.5006/1.3284837
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