INVESTIGATION OF ADSORPTION AND INHIBITIVE PROPERTIES OF SOME DIAMINE COMPOUNDS ON MILD STEEL CORROSION IN HYDROCHLORIC ACID SOLUTION

چکیده مقاله

In this work, the adsorption and corrosion inhibition effect of two new synthesized compounds on mild steel in 6M hydrochloric acid was studied by electrochemical impedance spectroscopy, Tafel polarization, weight loss, quantum, and atomic force microscopy methods. The obtained results show that these compounds are efficient corrosion inhibitors for mild steel in hydrochloric acid media. Electrochemical impedance spectroscopy shows that inhibition efficiency increases with increase of concentration of both inhibitors. These molecules obey the Langmuir adsorption isotherm. Some samples of mild steel were examined by atomic force microscopy. Quantum chemical calculations were further applied to reveal the adsorption structure and explain the experimental results.