Establishment of equivalent circuits from electrochemical impedance spectroscopy study of corrosion inhibition of steel by pyrazine in sulphuric acidic solution

Kissi, Mohamed; Bouklah, M.; Hammouti, B.; Benkaddour, M.

doi:10.1016/j.apsusc.2005.06.035

Cited by 234 publications

(85 citation statements)

References 33 publications

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“…A number of organic compounds are known to be applied as corrosion inhibitors for steel in acidic environments [1][2][3][4][5][6][7][8][9][10][11]. Such compounds typically contain nitrogen, oxygen or sulphur in a conjugated system and function via adsorption of the molecules on the metal surface, creating a barrier to corrodent attack.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

Ebenso¹,

Eddy²,

Odiongenyi³

2009

Port. Electrochim. Acta

123

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The corrosion inhibition of mild steel in H 2 SO 4 in the presence of methocarbamol was studied using thermometric and gasometric (hydrogen evolution) methods. The study revealed that the corrosion rate increases with temperature, time and concentration of H 2 SO 4 . Addition of methocarbamol to the corrodent solution lowered the corrosion rate of mild steel. Inhibition efficiency (%I) of methocarbamol was found to increase with concentration and decreased with temperature. Adsorption of methocarbamol molecule on mild steel surface was found to obey the Langmuir adsorption isotherm. The phenomenon of physical adsorption is proposed from the obtained thermodynamic parameters.

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Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

Ebenso¹,

Eddy²,

Odiongenyi³

2009

Port. Electrochim. Acta

123

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“…Fourier Transform Infrared spectroscopy was undertaken to identify the functional groups involved in the adsorption of VA constituents on the mild steel surface .The spectra of VA powder (1) and that of the surface scrapings removed from the mild steel surface after 24h immersion in 1 M HCl (2) and 0.5 M H 2 SO 4 (3) containing 1500 mg/L VA were recorded and the results are presented in Fig.9. The multiplicity of peaks observed for VA powder shows that the extract contained a complex mixture of constituents.…”

Section: Fourier Transform Infrared Spectroscopy Resultsmentioning

confidence: 99%

“…Some organic compounds are known to be applicable as corrosion inhibitors for mild steel in acidic media [1][2][3][4][5][6]. Many materials of plant origin have been successfully used to reduce metal corrosion in the past [7][8][9][10][11].…”

Section: Introductionmentioning

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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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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“…It is calculated from the relation [29] where R t is the charge transfer resistance in the case of steel immersed in corrosive solution, and R t ′ in the presence of oil inhibitor. The analysis of Table 5 let us conclude that the addition of L. stoechas oil enhances the values of R t and reduces the C dl values.…”

Section: Electrochemical Impedance Spectroscopy Characterizationsmentioning

confidence: 99%

“…The physical or chemical nature of adsorption depends on several parameters, such as the nature of the metal and its charge, the chemical structure of organic molecules as well as the type of the electrolyte. The surface coverage (θ) for different concentrations of L. stoechas oil in acid medium is evaluated by adopting gravimetry as study methods, we can write [4,27,29] (6)…”

Section: Kinetics-thermodynamics Parametermentioning

confidence: 99%

Development and validation of stability-indicating UPLC method for the determination of lafutidine and its impurities in bulk and pharmaceutical dosage form

et al. 2013

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The current study was designed to give more knowledge and helping to exploit the leaves of the plants L. stoechas collected in Tlemcen region in the west of Algeria by determining the anti-corrosive activity of its essential oil. The inhibitory efficiency of the essential oil of the plant obtained by hydrodistillation and characterized by GC and GC/MS was studied using gravimetric and electrochemical methods (polarization curves and electrochemical impedance). The effect of temperature on the corrosion behavior of the steel and the inhibitory efficiency was studied in a temperature range of 303-323 K at 2 g/L. The surface morphology of the samples immersed in 1 M HCl for 24 h, before and after adding inhibitor at (2 g/L at 30 °C) was analyzed by scanning electron microscope (SEM) Quanta 250 with tungsten filament from the company FEI. Results show that the addition of the essential oil of the plant to the medium induces a diminish in the rate of corrosion and augmentation in the inhibitory efficiency of the oil. We established that the inhibition efficiency increase with concentration of the essential oil of lavender to attain 76.19% at 2 g/L. Polarization curves revealed that lavender oil react as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability, and the changes in impedance parameters were indicative of adsorption of essential oil of lavender on the metal surface. The thermodynamic parameters indicate that the adsorption of the molecules of the oil takes place according to the Langmuir isotherm in the corrosive medium studied and that they are physisorbed on the metal surface. The analysis of the surface by electron microscopy demonstrates the absence of surface attack patterns in the presence of the oil. The results obtained from different tested techniques were in good agreement.

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Establishment of equivalent circuits from electrochemical impedance spectroscopy study of corrosion inhibition of steel by pyrazine in sulphuric acidic solution

Cited by 234 publications

References 33 publications

Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

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

Development and validation of stability-indicating UPLC method for the determination of lafutidine and its impurities in bulk and pharmaceutical dosage form

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