Ultrasound Assisted Green Synthesis of 3-(4- (dimethylamino) phenyl)-1-phenylprop-2-en-1-one and its Heterocyclics Derived from Hydrazine, Urea and Thiourea as Corrosion Inhibitor for Mild Steel in 1M

The purpose of present study was to investigate the corrosion inhibition property of 3-(4-(dimethylamino) phenyl)-1-phenylprop-2-en-1-one(a chalcone, INH-1) derived from condensation of acetophenone and 4, 4- dimethylamino benzaldehyde and three heterocyclics derived from this using Hydrazine (INH-2), Urea (INH-3) and Thiourea (INH- 4) on mild steel (MS) in 1M HCl by weight loss and electrochemical methods. It was found that inhibition efficiency increases with inhibitor concentration and maximum efficiency was obtained at 25 ppm. Among the studied inhibitors, INH-4 shows the best inhibition efficiency of 98.26 %. Variation of impedance parameters (Rct and Cdl) suggests the formation of protective film of inhibitors on MS surface. The adsorption of inhibitors on MS surface was also studied using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDX) techniques. The potentiodynamic study reveals that all studied compounds are of mixed type. The adsorption of inhibitors on MS surface was found to follow the Langmuir adsorption isotherm. The weight loss experiment was also performed at different temperature to study the effect of temperature on corrosion rate (CR) and evaluated some thermodynamic parameters