INHIBITION OF COPPER CORROSION BY ARYLAZOTRIAZOLES IN NITRIC-ACID SOLUTION

A study has been made to investigate the effect of some azoheterocycli c dyes of the type 3-arylazo 1,2,4-triazole (AT) on the corrosion of c opper exposed to 0.5 M nitric acid solution at different temperatures and at different AT concentrations. Using potentiodynamic polarization and Tafel electrochemical methods, it can be shown that AT compounds are good inhibitors of copper corrosion in HNO3 solution. The kinetic and thermodynamic parameters of the inhibited system were determined. The high inhibition efficiency of these compounds may be due to the ad sorption of the additive itself and/or the adsorption of the formed Cu (II)-AT complexes at the polarized electrode interface. Cathodic polar ization measurements showed that AT dyes are predominantly cationic in hibitors.