Abstract
A new imidazolidine 4-one derivative, of namly 2-[2-(4-Bromo-phenyl)-imidazo [1,2-a] pyridine-3-yl]-3-(4-nitro-phenyl)-imidazolidine-4-one (BPIPNP) was investigated as corrosion inhibitor for carbon steel in salty (3.5% NaCl) and acidic (0.5M HCl) solutions using potentiometric polarization measurements. The results revealed that the percentage inhibition efficiencies (%IE) in the salty solution (90.67%) are greater than that in the acidic solution (83.52%). Experimentally, the thermodynamic parameters obtained have supported a physical adsorption mechanism and which followed Langmuir adsorption isotherm. Density Functional Theory (DFT) of quantum mechanical method with B3LYP 6-311++G (2d, 2p) level was used to calculate geometrical structure, physical properties and inhibition efficiency parameters, in vacuum and two solvents (DMSO and H2O), all at the equilibrium geometry. The surface changes of carbon steel were studied using Scanning Electron Microscopy SEM and Atomic Force Microscopy (AFM) techniques.
Highlights
Corrosion is an undesirable phenomena occur because chemical or electrochemical reactions between a metal and its environment
In this research we focused on the Imidazo[1,2-a]pyridine derivative (BPIPNP), a heterocyclic entities and pharmacologically important molecule, Figure-1
The aim of this work is to study the inhibition efficiency of the organic inhibitor (BPIPNP) which was prepared by Naeemah Al-Lami et al [6]; experimentally, in salty (3.5% NaCl) and acidic (0.5M HCl) solutions using potentiostatic method, and theoretically, the calculations were done in three media depending on quantum mechanical parameters using Density Functional Theory (DFT) method with [6-311/ B3LYP++G (2d, 2p)] level using Gaussian 09 program
Summary
Corrosion is an undesirable phenomena occur because chemical or electrochemical reactions between a metal and its environment. The aim of this work is to study the inhibition efficiency of the organic inhibitor (BPIPNP) which was prepared by Naeemah Al-Lami et al [6]; experimentally, in salty (3.5% NaCl) and acidic (0.5M HCl) solutions using potentiostatic method, and theoretically, the calculations were done in three media (vacuum, DMSO, and water) depending on quantum mechanical parameters using DFT method with [6-311/ B3LYP++G (2d, 2p)] level using Gaussian 09 program. Three concentrations of (BPIPNP) inhibitor (5, 10 and 20) ppm were prepared, by dissolving (0.005, 0.01 and 0.02) gm, respectively in (6ml) DMSO, transferred each one to (1L) volumetric flask containing (40ml) HCl. The volume for each solution was completed to (1L) with the distilled water. The equilibrium geometry was calculated in two solvents of (DMSO and H2O)
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