Experimental and theoretical assessment of the inhibiting action of Aspilia africana extract on corrosion aluminium alloy AA3003 in hydrochloric acid

Mejeha, Ihebrodike M.; Nwandu, Michael C.; Okeoma, Kelechukwu B.; Nnanna, Lebe A.; Chidiebere, Maduabuchi A.; Eze, F. C.; Oguzie, Emeka E.

doi:10.1007/s10853-011-6079-2

Cited by 66 publications

(30 citation statements)

References 54 publications

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“…Table 3 lists the associated quantum chemical parameters, including HOMO energy (E HOMO ), LUMO energy (E LUMO ), energy gap (E LUMO-HOMO ), absolute hardness (η), absolute electronegativity (χ), electron charge transfer, (ΔN) absolute softness (σ), and the adsorption energies. Interestingly, the obtain values fall within the range reported for some organic inhibitors [34,51].…”

Section: Computational Resultssupporting

confidence: 87%

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Exploiting the Anticorrosion Effects of Vernonia Amygdalina Extract for Protection of Mild Steel in Acidic Environments

Adindu

Ogukwe

Eze

et al. 2016

Journal of Electrochemical Science and Technology

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The corrosion protection of mild steel in 1 M HCl and 0.5 M H solutions by ethanol extract of Vernonia amygdalina (VA) was studied using a combination of experimental and computational methods. The obtained results revealed that VA reduced the corrosion of mild steel in both environments and inhibition efficiency increased with VA concentration but decreased with prolonged exposure. Electrochemical results showed that the extract functioned via mixed corrosion inhibiting mechanism by adsorption of some organic constituents of the extract on the metal/acid interface. Findings from infrared spectroscopy and electron microscopy all confirmed that VA retarded mild steel corrosion in both 1 M HCl and 0.5 M H 2 SO 4 through an adsorption process. The adsorption behavior of selected constituents of the extract was modeled using density functional theory computations.

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Section: Computational Resultssupporting

confidence: 87%

“…This was achieved using the Materials Studio 4.0 software (BIOVIA Inc.) Electronic structure modeling was achieved in DMol 3 workspace, using a Mulliken population analysis, the DND basis set and the Perdew-Wang (PW) local correlation density functional [31,[49][50]. Details of the simulation are as described in [51]. Fig.…”

Section: Computational Resultsmentioning

confidence: 99%

Exploiting the Anticorrosion Effects of Vernonia Amygdalina Extract for Protection of Mild Steel in Acidic Environments

Adindu

Ogukwe

Eze

et al. 2016

Journal of Electrochemical Science and Technology

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“…Similar behaviour of steel in sulphuric acid has been reported (Keddam et al, 1981;Cang et al, 2013). It was observed that the diameter of the high frequency capacitive loop increased with increase in S+P concentration, indicating increased charge transfer resistance with increase in S+P concentration which was attributed to increased corrosion inhibition efficiency of S+P (Mejeha et al, 2012). Also, the Nyquist capacitive semi circles indicate that the corrosion process was mainly controlled by the charge transfer process (Rct) and double-layer capacitance Cdl 1 The low frequency inductive loop may be ascribed to either, the relaxation process resulting from the adsorption of intermediate species like H + , Cland other surface species exhibiting negative change with potential on the oxide film of the electrode surface (Bai and Conway, 1991;Lenderrink et al, 1993;Veloz and Gonzalez, 2002) or the re-dissolution of the passivated surface at low frequency (Sherif and Park, 2006;Lebrini.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Inhibition of pipeline steel corrosion in acidic environment using sulphadoxine and pyrimethamine

Int¹

2019

Preprint

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The anti-corrosive properties of sulphadoxine + pyrimethamine (S+P) on the corrosion of pipeline steel in acidic environment were investigated using electrochemical techniques. The results obtained showed an excellent inhibition efficiency which increased with increase in inhibitor concentration. The corrosion inhibition efficiency increased up to 99.04 % at 0.01M S+P and decreased with rise in temperature down to 85.93 % at 333 K and 0.01 M S+P, suggesting a physiosorptive mechanism of adsorption. Also the adsorption data was fitted into Langmuir and Temkin adsorption isotherms, while the inhibitive action was shown to proceed by mixed inhibition mode.

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“…Electronic parameters for the simulation include restricted spin polarization using DND basis set and Perdew-Wang(PW) local correlation density functional. Details of the computation methods are presented in [38,39]. Figure 10 represents the electronic properties of conessine, 10(a) represents the optimized structure 10(b) shows the highest occupied molecular orbital 10(c) represents the lowest unoccupied molecular orbital (LUMO) 10(d) is the total electron density 10(e) shows the center for electrophilic attack and 8(f) is the centre for nucleophilic attack.…”

Section: International Letters Of Chemistry Physics and Astronomy Vomentioning

confidence: 99%

Corrosion Inhibition of Mild Steel in 0.5 M H2SO4 Using Ethanol Extract of Funtumia elastica

Adindu

Oguzie

Ogukwe

2016

ILCPA

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ABSTRACT. The adsorption and corrosion inhibitive effect of the ethanol extract of Funtumia elastica (FE) leaves on mild steel corrosion in 0.5 M H 2 SO 4 was studied using gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopic techniques. As well as Fourier transform infrared spectroscopy and computational methods. The gravimetric and electrochemical studies revealed that FE is an adsorption inhibitor. The potentiodynamic polarization result showed that the inhibitor is a mixed type corrosion inhibitor for mild steel in 0.5 M H 2 SO 4 , inhibiting both the cathodic and anodic partial reactions. Density functional theory calculations were performed to model the electronic structures of some selected extract constituents (conessine, and ascorbic acid) to confirm their inhibiting potential and established their individual contributions to the observed inhibiting effects.

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Experimental and theoretical assessment of the inhibiting action of Aspilia africana extract on corrosion aluminium alloy AA3003 in hydrochloric acid

Cited by 66 publications

References 54 publications

Exploiting the Anticorrosion Effects of Vernonia Amygdalina Extract for Protection of Mild Steel in Acidic Environments

Exploiting the Anticorrosion Effects of Vernonia Amygdalina Extract for Protection of Mild Steel in Acidic Environments

Inhibition of pipeline steel corrosion in acidic environment using sulphadoxine and pyrimethamine

Corrosion Inhibition of Mild Steel in 0.5 M H<sub>2</sub>SO<sub>4</sub> Using Ethanol Extract of <i>Funtumia elastica</i>

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