Experimental and theoretical studies of 2-amino thiazole as an inhibitor for carbon steel corrosion in hydrochloric acid

Abstract

The corrosion inhibition of 2-amino thiazole (AT) for 45# steel in 0.1M HCl solution was studied by means of weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) methods. Quantum chemical calculations based on the density functional theory (DFT) method were performed on AT. The results showed that the corrosion inhibition efficiency of 2-amino thiazole was excellent, and its corrosion inhibition efficiency could reach 90.34% at 500 mg/L. The results obtained from the weight loss experiment and electrochemical experiments were in good agreement. Potentiodynamic polarization study showed that the 2-amino thiazole was a mixed-type inhibitor. And the slow-release process was controlled by electro transfer steps. The electronic properties obtained by quantum chemical approach were correlated with the experiment results.