Inhibition of copper corrosion in 3.5 percent NaCl solutions by triazole derivative

Purpose - The purpose of this paper is to study the corrosion behavior of copper in 3.5 percent NaCl solutions with and without 3-amino-5-mercapto-1,2,4-triazole (3-AMT). Design/methodology/approach - Weight-loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy are applied to study the corrosion behavior of copper in the absence and presence of different concentrations of 3-AMT under the influence of various experimental conditions. Findings - The results show that inhibition efficiency (IE) increases with increasing the immersion time in the presence of 1.0 x 10(-4) mol/l 3-AMT and the IE% maintains about 94 percent during the studied inhibitor concentration of 5.0 x 10(-3) mol/l. The Tafel polarization studies indicate that the IE% increases with increasing concentration of 3-AMT, and the compound was a mixed inhibitor. The adsorption of 3-AMT on the surface on copper has been found to obey the Langmuir adsorption isotherm, and the values of free energy of adsorption are calculated. 3-AMT is chemically adsorbed on the copper surface. Originality/value - The results of this paper can be used for reducing corrosion rates of copper in which a suitable inhibitor with the highest efficiencies is required in chloride solutions.