Experimental and Theoretical Studies of Schiff Bases Derived from ۳,۴-Diamino Pyridine as Corrosion Inhibitors for Carbon Steel N۸۰ in Acidic Medium

Two Schiff base compounds, S۱ and S۲, were synthesized from ۳,۴-diaminopyridine with ۴-chlorobenzaldehyde and ۴-diaminobenzaldehyde, respectively. These compounds were then characterized using various spectroscopic techniques, including Ultraviolet-Visible spectroscopy, infrared spectroscopy (FTIR), proton-nuclear magnetic resonance spectroscopy (۱H-NMR), carbon-۱۳ atom magnetic resonance spectroscopy (۱۳C-NMR), and electron ionization mass spectrometry (EI-Mass). The Tafel curve is a method used to measure electrochemical polarization. The findings of this investigation verified that the corrosion rate was more significant when inhibitors were not present but decreased when S۱ and S۲ inhibitors were introduced. The study also examined the activation energy and thermodynamic parameters of free energy (ΔG۰), enthalpy (ΔH۰), and entropy change (ΔS۰) using Langmuir adsorption isotherms. The electrochemical approach (Tafel extrapolation) verified that the developed solvents (S۱ and S۲) successfully inhibit corrosion by creating a protective film on the surface of the carbon steel.

کلیدواژه ها:

Schiff base ۳ ، ۴-diamino pyridine ، Inhibitors ، corrosion ، Carbon steel N۸۰