Theoretical and experimental inhibitive properties of mild steel in HCl by ethanolic extract ofBoscia senegalensis

Abstract

The experimental aspect of the corrosion inhibition potentials of Boscia senegalensis was carried out using gravimetric and linear polarization techniques techniques as well as scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), whereas the theoretical aspect was done by using the Density functional theory (DFT) calculations to performed and model the electronic structures of some extract constituents, including Physiosorptive interactions with the Fe surface. The analyses of the experimental results showed that the inhibition efficiency increased with increase in concentration of the inhibitor and decreased with increase in temperature. The efficiency of the extract in HCl (70%). Thermodynamic parameters revealed that the adsorption of extract onto the metal surface was spontaneous, exothermic and supported the Physical adsorption process. FTIR results showed that the inhibition mechanism was by absorption process, through the functional groups present in the extract and that of the inhibited. Surface morphology also revealed that corrosion product confirmed the protection offered by the extract on the surface of the metal immersed in the acid media. The data obtained were fitted into various adsorption isotherms though the Freundlich isotherm was found to be best fit.

Carbon steel corrosion: a review of key surface properties and characterization methods

“…They conrmed the interaction of extract and mild steel by observing a change in the spectra aer immersing mild steel in extract-containing HCl solution. Awe et al 135 studied the inhibitive property of Boscia senegalensis on mild steel in HCl medium. The FTIR study revealed that C-N and C]O bonds were responsible for the inhibitor interaction with the surface of mild steel as those bonds were missing in the spectra.…”

Computational Studies of the Corrosion Inhibition Potentials of Quercetin and Coumarin

“…Molecular weight indicates the possible metal surface coverage by the inhibitor. The larger the molecular weight of an inhibitor, the greater the ionization energy because large molecule volume implies increased surface coverage [13]. Molecular weight indicates possible metal coverage.…”

Computational Study for Molecular Properties of Some of the Isolated Chemicals from Leaves Extract of Guiera Senegalensis as Aluminium Corrosion Inhibitor

“…This configuration maximizes contact between the molecule and the metal surface. It has been reported that, the more negative the Eads of the inhibitor-metal surface, the better the adsorption of the inhibitor onto the metal surface and subsequently the higher the inhibition performance [32][33]. Based on the Eads values obtained, molecule B having more negative value of Eads is expected to perform better in inhibiting the corrosion of Al(1 1 0) in gas phase because of its molecular size and double bond on aromatic carbon atoms.…”