Effect of Substituted Benzotriazoles on the Anodic Dissolution of Iron in H2SO4

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Abstract
The kinetics of iron corrosion in deoxygenated 0.5M H2SO4 containing either unsubstituted benzotriazole or its 5-substituted derivatives, BTA-CH3 (TTA), BTA-NH2, BTA-NO2, BTA-Cl, and BTA-COOH have been investigated. At 0.1 mM and 2 hours immersion of iron, a simple adsorption mode of the inhibitors is indicated during anodic dissolution. At higher concentrations and at both 2 hours and 24 hours immersion, interaction of the inhibitor and a surface reaction intermediate during anodic dissolution is indicated. During cathodic polarization (i.e., hydrogen evolution reaction), the results show simple adsorption of the inhibitors at all of the above conditions. Correlations of the corrosion rates of inhibited iron and Hammett substituent constants have been obtained. Greater inhibition is obtained with electron-withdrawing substituents than with electron-providing substituents.

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