Corrosion behaviour of galvanized steel and electroplating steel in aqueous solution: AC impedance study and XPS

International audienceThe efficiency of a new triazole deriv., namely, 2-{(2-hydroxyethyl)[(4-methyl-1H-1,2,3-benzotriazol-1-yl)methyl]amino}ethanol (TTA) has been studied for corrosion inhibition of galvanized steel and electroplating steel in aq. soln. Corrosion inhibition was studied using electrochem. impedance spectroscopy (EIS). These studies have shown that TTA was a very good inhibitor. Data obtained from EIS show a frequency distribution and therefore a modeling element with frequency dispersion behavior, a const. phase element (CPE) has been used. The corrosion behavior of galvanized steel and electroplating steel in aq. soln. was also investigated in the presence of 4-methyl-1H-benzotriazole (TTA unsubstituted) by EIS. These studies have shown that the ability of the mol. to adsorb on the steel surface was dependent on the group in triazole ring substituent. XPS surface anal. with TTA shows that it chemisorbed on surface of galvanized steel and electroplating steel