Abstract
1-(2,4-Dimethylphenyl)-5-amino-1H-tetrazole (DAT) nanoparticles was synthesized and its inhibiting action on the corrosion of stainless steel 316L (SS316L) in sulfuric acid was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). A good correlation was observed between the potentiodynamic studies and EIS with electrochemical noise (EN) measurements. Hence, it seemed that the EN method could be applied as a complementary quantitative technique to study the corrosion behavior of inhibitors. The effect of inhibitors concentration on interpretation of noise resistance and spectral noise impedance was evaluated. Furthermore, Quantum chemical calculations were employed to provide further insight into the mechanism of inhibition by DAT. It was shown that the adsorption of inhibitors on the SS surface took place through both physical and chemical adsorption. The best fit to the experimental data was obtained using Langmuir adsorption isotherm.
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