Azo Schiff Base as Antiscaling Agent for Mild Steel in Hydrochloric Acid: Electrochemical, Non-electrochemical, and DFT Studies
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Anticorrosive behavior of Azo Schiff base ligand comprising 4-[5-((4-chlorophenyl) diazenyl)-2-hydroxybenzylideneamino]-1,5-dimethyl-2-phenyl-1H-pyrazole-3-(2H)-one (CDHBAP) on mild steel in 1 M HCl was investigated by Gravimetric method, AC Impedance measurements, and Tafel polarization techniques. The corrosion rate of mild steel in 1 M HCl solutions increased with increasing temperature (308–328 K). When increasing the concentration of CDHBAP (15–100 ppm), the corrosion rate of mild steel in 1 M HCl solutions decreases and inhibition efficiency is increased. Nyquist plot shows that charge resistance value increased with increasing concentration of CDHBAP. Polarization studies confirm that CDHBAP acts as mixed type inhibitor with predominant anodic effect. The Fourier transform-infrared spectroscopy (FT-IR) and UV–visible (UV–Vis) studies confirm the existence of an absorbed film on mild steel surface. Thermodynamic and adsorption studies reveal that adsorption of CDHBAP abide Langmuir adsorption isotherm. Quantum chemical calculations are further employed to enumerate the relation between quantum chemical parameters (EHOMO, ELUMO, ΔN) and corrosion inhibition efficiency.
KeywordsMild steel Weight loss Adsorption Langmuir DFT studies
This research did not receive any specific grant from funding agencies in the public, commercial, and other sectors.
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The authors declare that they have no conflict of interest.
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