دراسة الفعل التثبيطي لبعض المركبات العضوية في وسط أكال لنوع من الفولاذ (دراسة نظرية)
Résumé: The inhibiting performance of three benzidine derivatives named Bis (4(dimethylamino)benzylidene)biphenyl- 4,4′-diamine (DBB), Bis(4-methoxy benzylidene)biphenyl-4,4′-diamine (MBB) Bis(4-chlorobenzylidene)biphenyl-4,4′-diamine (CBB) for carbon steel (CS) corrosion in 1.0 M HCl aqueous media was evaluated using weight loss and electrochemical techniques. The affinity of tested compounds towards the steel surface was investigated using Density Functional Theory (DFT) and Molecular Dynamics (MD) simulations. Compounds revealed a good inhibition action in tested medium even at low concentrations and the inhibition efficiency increases with increasing concentration of inhibitors. Polarization curves show that they act as mixed-type inhibitors and their adsorption process obeyed the Langmuir adsorption model. SEM, AFM and EDX studieswere used to confirm the presence of the protective film formed on the carbon steel surface by observing the corrosion attack morphologies and elemental composition of the corrosion products, respectively. DFT results complement experimental studies and demonstrate that Schiff base moieties and functional groups are responsible for corrosion inhibitive performances of investigated compounds.
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