Abstract

KHADOM, ANEES A; YARO, APRAEL S  and  KADHUM, ABDUL AMIR H. ADSORPTION MECHANISM OF BENZOTRIAZOLE FOR CORROSION INHIBITION OF COPPER-NICKEL ALLOY IN HYDROCHLORIC ACID. J. Chil. Chem. Soc. [online]. 2010, vol.55, n.1, pp. 150-152. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072010000100035.

The inhibition of copper corrosion by Benzotriazole (BTA) in 5% HC1 has been investigated by weight loss technique at different temperatures. Langmuir adsorption isotherm, Freundlich Adsorption Isotherm and Kinetic-Thermodynamic Model were used to describe the adsorption process depending on values of surface converge. Maximum value of surface converge was 0.998 for BTA at 35 °C and 15 g/1 inhibitor concentration, while the lower value was 0.868 at 55 °C and 1 g/1 inhibitor concentration. The films formed on the copper-nickel alloy surface of BTA appeared to obey the Langmuir Adsorption Isotherm more than Freundlich adsorption isotherm. In the other hand, results showed that the Kinetic-Thermodynamic Model was unsuitable to fit the experimental data of the BTA of the present study.

Keywords : adsorption isotherms; corrosion inhibition; copper-nickel alloy; benzotriazole; inhibitor efficiency.