Synthesis, Characterization, Thermodynamic Analysis and Quantum Chemical Approach of Branched N, N′-bis(p-hydroxybenzoyl)-Based Propanediamine and Triethylenetetramine for Carbon Steel Corrosion Inhibition in Hydrochloric Acid Medium

Abstract The influence of branched N , ′-bis( p -hydroxybenzoyl) containing propylenediamine (PDA) and triethylenetetramine (TETA) composites for corrosion inhibition carbon steel in acidic solution (1 M HCl) was investigated using several quantum chemical, electrochemical impedance spectroscopy potentiodynamic polarization as techniques. molecules were posteriorly characterized by proton nuclear magnetic resonance ( 1 H NMR) Fourier transform infrared (FTIR) while the surfaces test coupons X-ray diffraction (XRD) scanning electron microscopy (SEM) obtained results revealed that two amino compounds, propanediamine ′-HBPDA) ′-HBTETA), have significant efficiency toward attack its performance significantly boosted increasing concentration di- tetramine inhibitors. inhibitors achieved a maximum 99.1% indicated from measurements. isotherm feature Langmuir adsorption appeared to be proper factor associating experimental gains with an applicable mechanism process. free energy ∆G ads calculated − 27.5, 29.1 kJ/mol based on model, indicating physical surface. Further, images morphological analysis exhibited various features owing aggressive medium employed inhibitor. These synthesized amines supplied many favorable scores fabrication functional mixed-type computational studies reveal ′-HBPDA ′-HBTETA could absorb via lone pairs π clouds, confirming their ability good