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Published on: March 15, 2017
Influence of 5-Chlorobenzotriazole on Inhibition of Copper Corrosion in Acid Rain Solution
Ana T Simonović1, Žaklina Z Tasić1, Milan B Radovanović1
1Technical Faculty in Bor, University of Belgrade, Bor, VJ 12, P.O. Box 50, 19210 Bor, Serbia.
Abstract:
This paper aims to examine the efficiency of 5-chlorobenzotriazole (5Cl-BTA) as a copper corrosion inhibitor in acidic rain solutions with a pH value of 2.42 by the electrochemical polarization method. 5-Chlorobenzotriazole acts similar to a mixed type inhibitor, according to the potentiodynamic polarization measurements. Results obtained in this research suggest that 5Cl-BTA is a good inhibitor; it decreases anodic and cathodic reaction rates, and the highest inhibition efficiency was 91.2%. The inhibitory effect of 5-chlorobenzotriazole is explained by the formation of the layer on the copper surface. Stability of the protective layer increased with inhibitor concentration. Scanning electron microscopy and energy-dispersive analysis of X-rays analysis confirmed that on the electrode surface, a protective layer was formed. Adsorption of 5Cl-BTA obeys the Langmuir adsorption isotherm. 5Cl-BTA showed good inhibitory characteristics even when the Cl- ions were present in examined solutions.
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