Effects of Substituted Benzotriazoles on the Electrochemical Behavior of Copper in H2SO4
- 1 April 1981
- journal article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 37 (4) , 223-225
- https://doi.org/10.5006/1.3577274
Abstract
Rates of anodic dissolution of copper as well as hydrogen evolution in H2SO4 containing substituted benzotriazoles have been examined. The aromatic ring-substituted benzotriazoles studied were: 5-NH2, 5-NO2. 5-CH3, 5-Cl, 5-C00H, a mixture of 4-C00H and 5-COOH, and the unsubstituted benzotriazole (BTA). The anodic polarization results indicate that BTA-NH2, BTA-COOH and BTA-Cl inhibit copper electrodissolution by surface blockage, with the bare copper surface oxidizing to Cu(II) as the uninhibited metal. In the presence of the other benzotriazoles, copper apparently oxidizes to Cu(I) by forming slightly soluble organo-Cu(I) complexes as the oxidation product. As reported previously by others, copper electrooxidizes to cuprous chloride complexes in the presence of chloride ions (0.1M). None of the benzotriazoles had any effect on the anodic dissolution of copper in the acidic chloride solutions below zero volts vs SCE. On the other hand, at higher potentials where a current plateau was obtained, as...Keywords
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