Anticorrosive Effect of Halogenated Aniline Enaminoesters on Carbon Steel in HCl

Four enaminoesters derived from halogenated aniline, with potential anticorrosion activity, were synthesized and tested against carbon steel AISI 1020 in acid medium using 1.0 mol L-1 HCl. The synthesis was demonstrated through the reaction of ethyl acetoacetate four different amines, presence glacial acetic molecular sieve, ethanol as solvent for 24 h. evaluation anticorrosive activity performed gravimetric technique electrochemical methods, such impedance spectroscopy (EIS), linear polarization resistance (LPR), potentiodynamic (PP). Results indicated that F-EN (Ethyl (2Z)-3-[(4-fluoro-phenyl)-amino]-but-2-enoate) inhibitor had higher corrosion inhibition efficiency, 98% by mass loss, 85% techniques. Adsorption obeyed Langmuir isotherm, thus suggesting inhibitors form a monolayer film metal surface. These results also contributed to calculations physicochemical parameters E a , id="M2"> △ H ≠ ads id="M3"> S which confirmed when compared absence inhibitors.