Thermodynamic characterization of metal dissolution and inhibitor adsorption processes in mild steel/2,5-bis(n-thienyl)-1,3,4-thiadiazoles/hydrochloric acid system

Bentiss, Fouad; Lebrini, Mounim; Lagrenée, Michel

doi:10.1016/j.corsci.2005.05.034

Cited by 915 publications

(321 citation statements)

References 31 publications

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“…In order to gain more information about the mode of adsorption (physisorption, chemisorption or comprehensive adsorption) of the drug on the surface of CS, the experimental data have been tested with several adsorption isotherms (Langmuir, Freundlich, Temkin, kinetic-thermodynamic model and Flory-Huggins isotherm). A very good fit is observed with a regression coefficient (R 2 = 0.9994) for the Langmuir adsorption isotherm which confirms the validity of this approach (29). The Langmuir adsorption isotherm is based on the view that every adsorption site is identical and energetically equivalent (30).…”

Section: Adsorption Considerationsupporting

confidence: 54%

Studies on the inhibition of carbon steel corrosion in hydrochloric acid solution by expired Carvedilol drug

Fouda

Morsi

Mogy

2017

Green Chemistry Letters and Reviews

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An expired pharmaceutical product, Carvedilol, was studied as save drug to prevent carbon steel (CS) corrosion in acidic environments by using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The inhibition efficiency increased with increasing drug dose and decreased with increasing temperature, reaching a maximum value of 98.94% at 25°C and 1.6 × 10 −4 M. Polarization data showed that the drug is of a mixed type. The inhibition of CS corrosion by Carvedilol can be attributed to the adsorption ability of drug molecules onto the reactive sites of the metal surface. The adsorption process follows the Langmuir isotherm via physical adsorption. The surface morphologies of CS were examined by atomic force spectroscopy (AFM). The results obtained from different techniques are in good agreement.

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Section: Adsorption Considerationsupporting

confidence: 54%

Studies on the inhibition of carbon steel corrosion in hydrochloric acid solution by expired Carvedilol drug

Fouda

Morsi

Mogy

2017

Green Chemistry Letters and Reviews

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“…R p value decreases with the increasing temperature due to the desorption process from the mild steel surface to the bulk of the solution. The obtained semicircles are not perfect semicircles; this is because of the typical behavior of a solid metal electrode that shows frequency dispersion of the impedance data [10,11] which is attributed to the roughness and other inhomogeneities of the solid surface [12][13][14].…”

Section: Electrochemical Impedance Spectroscopic (Eis) Measurementmentioning

confidence: 99%

Inhibition study of mild steel corrosion in 1 M hydrochloric acid solution by 2-chloro 3-formyl quinoline

Prasanna¹,

Praveen²,

Hebbar³

et al. 2015

Int J Ind Chem

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The corrosion inhibition study of 2-chloro 3-formyl quinoline was conducted for mild steel corrosion in 1 M hydrochloric acid solution at a temperature range of 303-333 K by chemical and electrochemical measurements. Inhibition efficiency increases with the increase of inhibitor concentration but decreases with increasing temperature. The polarization measurement reveals that the inhibitor acts as the mixed type and this inhibition effect is attributed to the adsorption of the inhibitor on the surface of mild steel from the bulk of the solution. The adsorption of 2-chloro 3-formyl quinoline on mild steel surface is exothermic and obeys the Freundlich adsorption isotherm. Thermodynamic parameters and activation parameters were calculated and discussed in depth. Scanning electron microscopy (SEM) micrographs were used to investigate the surface morphology of the steel sample in presence and absence of inhibitor.

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“…It was found that the linear correlation coefficients clearly prove that the adsorption of the formazan of benzaldehyde (FB) from 1 M HCl than 2 M HCl solutions on the mild steel corrosion obeys the Langmuir adsorption isotherm. The negative values of ∆G 0 ads for the addition of inhibitors indicate that the process of adsorption of studied inhibitors is spontaneous in nature 21 . The free energy of adsorption of (∆G ads ), in 1 M HCl was found to be -6.548 kJmol −1 while for 2 M HCl it was found to be -5.290 kJmol −1 , respectively.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Effect Formazan of Benzaldehyde as Corrosion Inhibitor on Preventing the Mild Steel Corrosion in Acidic Medium

2013

Chem Sci Trans

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Abstract:The effect of formazan of benzaldehyde (FB) on the corrosion of mild steel in acidic media (1 M HCl and 2 M HCl) has been investigated using weight loss measurements, electrochemical studies and surface analysis. These studies have also shown that formazan of benzaldehyde is a good inhibitor for mild steel in 1 M HCl and 2 M HCl acid solutions at room temperature in 2 h. In 1 M HCl the inhibition efficiency was high when compared to 2 M HCl acid solutions. The surface analysis also confirms the corrosion inhibition of the mild steel by the inhibitor (FB).

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Thermodynamic characterization of metal dissolution and inhibitor adsorption processes in mild steel/2,5-bis(n-thienyl)-1,3,4-thiadiazoles/hydrochloric acid system

Cited by 915 publications

References 31 publications

Studies on the inhibition of carbon steel corrosion in hydrochloric acid solution by expired Carvedilol drug

Studies on the inhibition of carbon steel corrosion in hydrochloric acid solution by expired Carvedilol drug

Inhibition study of mild steel corrosion in 1 M hydrochloric acid solution by 2-chloro 3-formyl quinoline

Effect Formazan of Benzaldehyde as Corrosion Inhibitor on Preventing the Mild Steel Corrosion in Acidic Medium

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