Thermodynamic and kinetic factors in chloride ion pitting and nitrogen donor ligand inhibition of aluminium metal corrosion in aggressive acid media

El-Awady, Abbas A.; Abd-El-Nabey, B.A.; Aziz, Saadullah G.

doi:10.1039/ft9938900795

Cited by 47 publications

(24 citation statements)

References 16 publications

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“…The data obtained are presented in Table 2. The results showed that Rct is arranged in the order: HCl < HClO4 < H2SO4; these results are in agreement with the results obtained from the potentiodynamic polarization technique and also with the results obtained previously [15] using the gasometry technique. It has been reported that the addition of Clions increases the anodic dissolution rate of aluminum either by incorporation of the Clion into the oxide film, by which additional charge carriers are generated [16], or by the participation of Clions in the metal dissolution reaction [17,18].…”

Section: Plant and Preparation Of The Plant Extractsupporting

confidence: 91%

nionic Effect on the Acidic Corrosion of Aluminum and its Inhibition by Lupine Extract

Abd-El-Naby

Abdullatef

El-Kshlan

et al. 2015

Port. Electrochim. Acta

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Corrosion behavior of aluminum in 0.1 M HCl, 0.1 M HClO4 and 0.05 M H2SO4 solutions was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results showed that the rate of corrosion of aluminum was arranged in the order: HCl > HClO4 > H2SO4. Lupine extract is an effective green inhibitor for the corrosion of aluminum in acidic solutions. The inhibition efficiency of the extract was found to increase with increasing the concentration of the extract. The obtained results showed that the lupine extract is effective in the order HClO4 > HCl > H2SO4. Theoretical fitting of the corrosion data to the Kinetic-thermodynamic model was tested to clarify the nature of adsorption.

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Section: Plant and Preparation Of The Plant Extractsupporting

confidence: 91%

nionic Effect on the Acidic Corrosion of Aluminum and its Inhibition by Lupine Extract

Abd-El-Naby

Abdullatef

El-Kshlan

et al. 2015

Port. Electrochim. Acta

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“…[2][3] A kinetic-thermodynamic model for the adsorption process at the metal-solution interface has been suggested. 4 Ddata have been analyzed in terms of an active site occupancy (y), a binding constant (K) of the inhibitor to the active site (a measure of its effectiveness), and the effects of temperature, chain length, and number of ligating atoms per inhibitor molecule on those parameters. 4 Ddata have been analyzed in terms of an active site occupancy (y), a binding constant (K) of the inhibitor to the active site (a measure of its effectiveness), and the effects of temperature, chain length, and number of ligating atoms per inhibitor molecule on those parameters.…”

Section: Introductionmentioning

confidence: 99%

Application of the Kinetic-Thermodynamic Model for Inhibition of Acid Corrosion of Steel by Inhibitors Containing Sulfur and Nitrogen

Abd-El-Nabey¹,

Khamis²,

Ramadan³

et al. 1996

CORROSION

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Corrosion inhibition characteristics of four selected Salkylisothioronium halides on steel in sulfuric acid (H 2 SO 4 ) media were investigated at 30°C, 40°C, 50°C, and 60°C. The number of active sites on the metal occupied by a molecule of the inhibitor (1/y) and the binding constants (K) of the inhibitor to the active sites were calculated at the different temperatures. Activation free energies, enthalpies, and entropies for the inhibition processes were determined from rate-constant data measured at 30°C, 40°C, 50°C, and 60°C at two fixed inhibitor concentrations. Data were compared and fitted to a published kinetic-thermodynamic model. Results were compared with fits obtained from application of Langmuir, Frumkin, and Flory-Huggins isotherms. Results also were correlated to the chemical structure of the inhibitors, the length of the alkyl chain of the cation, and the type of the anion.

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“…The following mechanism was proposed for the corrosion of aluminium in hydrochloric acid. 8 Thus this reaction can prevent oxidation reaction of AlCl ads to AlCl z 2 as shown by reaction (b). Immediately afterwards as the corrosion reaction starts it is possible that alkalinity produced at cathodic sides due to hydrogen evolution favours the free base as shown by reaction (f) InH z (soln)'InzH z 'Al : In : : : : : : : (f)…”

Section: Resultsmentioning

confidence: 96%

Electrochemical thermodynamic and kinetic studies of the behaviour of aluminium in hydrochloric acid containing various benzotriazole derivatives

Bereket¹,

Pinarbasi²

2004

Corrosion Engineering, Science and Technology

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In this study the inhibitive behaviour of benzotriazole, 5-methyl benzotriazole, 5-chloro benzotriazole and 5-nitro benzotriazole on the corrosion of pure aluminium in 0?1M HCl has been investigated by the potentiostatic polarisation technique. For this purpose, corrosion potentials E corr , corrosion rates i corr , anodic and cathodic Tafel slopes b a , b c , inhibition efficiencies IE, and surface coverages h, were determined in 0?1M HCl solutions containing various concentrations (i.e. 1610 25 M, 5610 25 M, 1610 24 M, 5610 24 M, 1610 23 M) of benzotriazole derivatives. The efficiency of the studied benzotriazole derivatives at a concentration of 1610 24 M was found be in the following order: 5-nitrobenzotriazole.5-methyl benzotriazole.5chloro benzotriazole.benzotriazole. It was observed that the benzotriazole derivatives were behaving as cathodic inhibitors and the inhibiting action of these heterocyclic compounds was mainly due to adsorption on the metal surface, which parallels the total negative charge of each molecule. From the adsorption isotherms, values of the free energy of adsorption DG ads and the equilibrium constant K ads for the adsorption processes were calculated. Corrosion rates were determined electrochemically at 20uC, 30uC, 40uC, 50uC and 60uC with 1610 24 M or 1610 23 M of these compounds in 0?1M HCl. From the corrosion rates obtained at different temperatures, activation parameters for the corrosion processes such as activation energies E a , activation enthalpies DH* and activation entropies DS* were determined and possible mechanisms for the corrosion and inhibition processes have been proposed. CEST/1958

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Thermodynamic and kinetic factors in chloride ion pitting and nitrogen donor ligand inhibition of aluminium metal corrosion in aggressive acid media

Cited by 47 publications

References 16 publications

nionic Effect on the Acidic Corrosion of Aluminum and its Inhibition by Lupine Extract

nionic Effect on the Acidic Corrosion of Aluminum and its Inhibition by Lupine Extract

Application of the Kinetic-Thermodynamic Model for Inhibition of Acid Corrosion of Steel by Inhibitors Containing Sulfur and Nitrogen

Electrochemical thermodynamic and kinetic studies of the behaviour of aluminium in hydrochloric acid containing various benzotriazole derivatives

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