The inhibition of 4-(2′-amino-5′-methylphenylazo) antipyrine on corrosion of mild steel in HCl solution

Rehim, Sayed S. Abd El; Ibrahim, Magdy A. M.; Khalid, Khadijah

doi:10.1016/s0254-0584(00)00462-4

Cited by 269 publications

(85 citation statements)

References 12 publications

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“…Results presented in this table show that lower E a values were obtained in the presence of inhibitors compared to the blank. Also, E a values decreased with increase in concentration of GA. Lower E a values in the presence of the additives compared to those in the blank solution indicate that the inhibitor will be less effective at ordinary temperatures, but inhibition efficiency increased considerably at higher temperatures [37,38]. Such behaviour was observed for the temperature dependence of the inhibition efficiency for GA alone and in combination with KI in this study and further supports the proposed chemisorption mechanism.…”

Section: Kinetic/ Thermodynamic Studiessupporting

confidence: 83%

Synergistic Influence of Gum Arabic and Iodide Ion on the Corrosion Inhibition of Aluminium in Alkaline Medium

Umoren

2009

Port. Electrochim. Acta

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The effect of iodide ion on the corrosion inhibition of aluminium in NaOH in the presence of Gum Arabic (GA) was studied using weight loss and hydrogen evolution techniques at 303 and 313 K. The results obtained showed that inhibition efficiency increased with increasing GA concentration. The inhibiting action of GA was considerably enhanced by the addition of KI. The adsorption of KI, GA alone and in combination with iodide ion was found to obey Temkin adsorption isotherm. The inhibiting effect of GA and (GA+KI) increased with increase in temperature of the corrosion medium, indicating chemical adsorption mechanism. Synergism parameter evaluated was found to be greater than unity for the different concentrations of GA, which shows that the enhanced inhibition of GA caused by the addition of iodide ion is due to synergistic effect. It could be deduced from the thermodynamic parameters obtained that adsorption of GA alone and in combination with KI onto the metal surface is spontaneous.

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Section: Kinetic/ Thermodynamic Studiessupporting

confidence: 83%

Synergistic Influence of Gum Arabic and Iodide Ion on the Corrosion Inhibition of Aluminium in Alkaline Medium

Umoren

2009

Port. Electrochim. Acta

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“…and 3APPH compounds, has been investigated by the electrochemical impedance spectroscopy (EIS) at 30 ∘ C. The charge transfer resistance ( ct ) values were calculated from the difference in impedance at lower and higher frequencies [18,19].…”

Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 99%

Interaction of Two Water Soluble Heterocyclic Hydrazones on Copper in Nitric Acid: Electrochemical, Surface Morphological, and Quantum Chemical Investigations

Raphael

Kakkassery

Shanmughan

et al. 2016

International Journal of Metals

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Two novel heterocyclic compounds (E)-2-(1-(pyridin-3-yl)ethylidene)hydrazinecarbothioamide (3APTSC) and (E)-3-(1-(2-phenylhydrazono)ethyl)pyridine (3APPH) derived from 1-(pyridin-3-yl)ethanone were synthesized and characterized by various spectroscopic techniques. The corrosion inhibition efficacies of these compounds on copper in 0.1 M HNO 3 were screened by electrochemical corrosion monitoring techniques such as potentiodynamic polarization studies and impedance spectroscopy. Investigations clearly established that 3APPH displayed higher corrosion inhibition efficiency on Cu than 3APTSC at all concentrations. The mechanism of inhibition was verified with the help of adsorption isotherms. 3APTSC and 3APPH obeyed Langmuir adsorption isotherm on Cu surface. Thermodynamic parameters such as adsorption equilibrium constant ( ads ) and free energy of adsorption (Δ ads ) were also evaluated. Potentiodynamic polarization investigations confirmed that the 3APTSC and 3APPH act as mixed type inhibitors. Surface analysis of the metal specimens was performed by scanning electron microscopy. Energy of HOMO and LUMO, their difference, number of electrons transferred, electronegativity, chemical hardness, and so forth were evaluated by quantum chemical studies. Agreeable correlation was observed between the results of quantum chemical calculations and other corrosion monitoring techniques.

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“…The decrease in cathodic (b c ) and anodic (b a ) or the increase in (b a ) only in case of solutions of pH 4 Tafel slopes (Table 1) indicated that the 1-Butyl-4-methylpyridinium tetrafluoroborate molecules are adsorbed on both the anodic and cathodic sites resulting in an inhibition of both anodic dissolution of copper and cathodic reduction reactions. Moreover, these inhibitors cause small change in the cathodic and anodic Tafel slopes, indicating that 4MBPBF 4 is first adsorbed onto copper surface and therefore impedes the reaction by merely blocking the reaction sites of copper surface without affecting the cathodic and anodic reaction mechanism [57].…”

Section: Polarization Behaviour Of Coppermentioning

confidence: 99%

Inhibition Effect of 1-Butyl-4-Methylpyridinium Tetrafluoroborate on the Corrosion of Copper in Phosphate Solutions

Scendo¹,

Uznanska²

2011

International Journal of Corrosion

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The influence of the concentration of 1-Butyl-4-methylpyridinium tetrafluoroborate (4MBPBF 4 ) as ionic liquid (IL) on the corrosion of copper in 0.5 M PO 3− 4 solutions of pH 2 and 4 was studied. The research involved electrochemical polarization method, and scanning electron microscopy (SEM) technique. The results obtained showed that the inhibition efficiency of corrosion of copper increases with an increase in the concentration of 4MBPBF 4 but decreases with increasing temperature. The thermodynamic functions of corrosion analysis and adsorptive behavior of 4MBPBF 4 were carried out. During the test, the adsorption of the inhibitor on the copper surface in the phosphate solutions was found to obey the Langmuir adsorption isotherm and had a physical mechanism.

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The inhibition of 4-(2′-amino-5′-methylphenylazo) antipyrine on corrosion of mild steel in HCl solution

Cited by 269 publications

References 12 publications

Synergistic Influence of Gum Arabic and Iodide Ion on the Corrosion Inhibition of Aluminium in Alkaline Medium

Synergistic Influence of Gum Arabic and Iodide Ion on the Corrosion Inhibition of Aluminium in Alkaline Medium

Interaction of Two Water Soluble Heterocyclic Hydrazones on Copper in Nitric Acid: Electrochemical, Surface Morphological, and Quantum Chemical Investigations

Inhibition Effect of 1-Butyl-4-Methylpyridinium Tetrafluoroborate on the Corrosion of Copper in Phosphate Solutions

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