Inhibition of Copper Corrosion by 2-Aminobenzenethiol in Aerated 2 M HNO₃ Medium

摘要

Effect of 2-aminobenzenethiol (ABT) on copper corrosion as a corrosion inhibitor in an aerated acidicsolution of 2 M HNO3 has been investigated using gravimetric and electrochemical techniques. Asignificant decrease in the corrosion rate of copper was observed in the presence of the investigatedorganic compound. The potentiodynamic polarization data indicated that the inhibitor was of mixedtype. Impedance measurements showed that the charge transfer resistance increased and double layercapacitance decreased with increase in the inhibitor concentration. Adsorption of ABT molecules oncopper surface was found to obey the Langmuir adsorption isotherm. Also, some thermodynamic datafor the adsorption and dissolution processes are calculated and discussed. Results obtained frompotentiodynamic polarization, impedance measurements and gravimetric method are in goodagreement.