Preparation of Chromone-Based Schiff Base as Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid

In this study, a novel Schiff base compound based on chromone was synthesized and its inhibition efficiency on corrosion of carbon steel in the hydrochloric acid was investigated. In this regard, the inhibition efficiency of the compound were investigated by weight loss methods, UV-Vis test, electrochemical methods such as electrochemical impedance spectroscopy (EIS) and polarization, scanning electron microscopy (SEM), X-ray diffraction spectroscopy (EDX) and absorption isotherm. The results of the studies indicated good inhibition efficiency with an efficiency above 92% for the synthesized Schiff base in the acidic media. Concentrations of 0.5, 1, 1.5 and 2 mM were investigated for the inhibitor, and the best result was obtained at concentration of 1 mM. SEM-EDX results showed that in the presence of inhibitor, the adsorption amount of chloride ions on the steel surface decreased to 90% and according to the adsorption isotherm, Inhibitor absorption on the steel surface follows Langmuir adsorption isotherm.