Electrochemical studies on the effect of (2E)‐3‐amino‐2‐phenylazo‐but‐2‐enenitrile and its derivative on the behaviour of copper in nitric acid

El‐Maksoud, S. A. Abd; Hassan, Hamdy H.

doi:10.1002/maco.200604021

Cited by 35 publications

(13 citation statements)

References 45 publications

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“…The electrochemical parameters including charge transfer resistance (R t ) and double layer capacitance (C dl ) derived from the Nyquist plots, which were described elsewhere [6], are given in Table 2. The inhibition efficiencies (IE Rt ) from R t for the corrosion of steel were calculated and also listed in Table 2 by means of the following equation [6,7,22,23]:…”

Section: Tafel Polarizationmentioning

confidence: 99%

Synergistic inhibition between dodecylamine and potassium iodide on the corrosion of cold rolled steel in 0.1 M phosphoric acid

Hao

Jiang

et al. 2008

Materials & Corrosion

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The corrosion inhibition of cold rolled steel in 0.1 M aerated phosphoric acid (H 3 PO 4 ) in the presence of dodecylamine (DDA) and potassium iodide (KI) has been investigated by Tafel polarization curve and electrochemical impedence spectroscopy (EIS) at 20 8C. The results obtained from polarization curve show that the inhibition efficiency of DDA with and without KI increases with increase in concentration of DDA but the inhibition efficiency of DDA without KI is not too high. A synergistic effect exists when DDA and KI are combined together to prevent cold rolled steel corrosion in 0.1 M H 3 PO 4 . All impedance spectra in EIS tests exhibit one capacitive loop which indicates that the corrosion reaction is controlled by charge transfer process. Inhibition efficiencies obtained from Tafel polarization, transfer resistance (R t ) are consistent.

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Section: Tafel Polarizationmentioning

confidence: 99%

Synergistic inhibition between dodecylamine and potassium iodide on the corrosion of cold rolled steel in 0.1 M phosphoric acid

Hao

Jiang

et al. 2008

Materials & Corrosion

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“…These corrosion inhibitors can adsorb on the metal surface in acidic solutions through their atoms and double bonds. Inhibitor adsorption on the metal surface can reduce the corrosion rate of metal . One of the most effective inhibitors that can be used in acidic solutions is indole‐based inhibitors .…”

Section: Introductionmentioning

confidence: 99%

Indole-3-acetic acid and N-acetyltryptophan corrosion inhibition effects on mild steel in 1 M hydrochloric acid solution

Ashhari

Sarabi

2014

Surf. Interface Anal.

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Corrosion inhibition of indole‐3‐acetic acid and N‐acetyl tryptophan on carbon steel was investigated using polarization and electrochemical impedance spectroscopy (EIS). Polarization results revealed that corrosion inhibitors could reduce the rate of cathodic and anodic reactions on metal surface. EIS analysis showed inhibition efficiency of indoles increases by increasing the inhibitor concentration. The maximum inhibition efficiency was 97% and 80% in solutions containing 10 mM indole‐3‐acetic acid and 10 mM N‐acetyl tryptophan, respectively. The adsorption of inhibitors was found to follow Langmuir isotherm. Adsorption and film formation of inhibitors on the metal substrate were confirmed by calculating thermodynamic adsorption parameter (ΔG0ads) and characterization of exposed metals' surface through contact angle measurements. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Physiorption is due to electrostatic attractive forces between the inhibiting organic ions or dipoles and the electrically charged surface of the metal. Chemisorption is due to interaction between unshared electron pairs or p-electrons of the adsorbate with the metal in order to form a coordinate type of bond [18][19][20][21]. Generally, values of DG ads around À20 kJ/mol or lower are consistent with the electrostatic interaction between charged molecules and the charged metal surface (physisorption); and those around À40 kJ/mol or higher involve charge sharing or transfer from organic molecules to the metal surface to form a coordinate type of metal bond (chemisorption).…”

Section: Adsorption Isothermmentioning

confidence: 99%

Adsorption effect of 1‐((2‐hydroxynaphtalen‐1‐yl) (phenyl)methyl)urea on the carbon steel corrosion in hydrochloric acid media

Hosseini

Bahrami

Pilvar³

2009

Materials & Corrosion

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The adsorption effect of 1-((2-hydroxynaphtalen-1-yl)(phenyl)methyl)urea (HNPU) on corrosion behavior of carbon steel in 1 M hydrochloric acid solution was investigated using weight loss, potentiostatic polarization, and infrared spectroscopy methods. Surface morphology was studied by scanning electron microscopy (SEM). The experimental results, suggest that HNPU inhibited the corrosion of carbon steel in acid solution and the inhibition efficiencies increased as the concentration of the compound in the solution was increased. The calculated inhibition efficiencies from the two investigated methods were in good agreement. Potentiostatic polarization measurements indicate that HNPU acts as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface obeys Langmuir adsorption isotherm. The values of activation energy and the thermodynamic parameters, such as adsorption equilibrium constant (K ads ), adsorption free energy (DG ads ), adsorption heat (DH ads ), and adsorption entropy (DS ads ) values were calculated and discussed. The results obtained from infrared spectra, confirmed the adsorption of inhibitor on the alloy surface after immersion in acidic solution containing HNPU. The SEM analysis indicated that there are more lightly corroded and oxidative steel surface for the specimens after immersion in acidic solution containing HNPU than that in blank.

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Electrochemical studies on the effect of (2E)‐3‐amino‐2‐phenylazo‐but‐2‐enenitrile and its derivative on the behaviour of copper in nitric acid

Cited by 35 publications

References 45 publications

Synergistic inhibition between dodecylamine and potassium iodide on the corrosion of cold rolled steel in 0.1 M phosphoric acid

Synergistic inhibition between dodecylamine and potassium iodide on the corrosion of cold rolled steel in 0.1 M phosphoric acid

Indole-3-acetic acid and N-acetyltryptophan corrosion inhibition effects on mild steel in 1 M hydrochloric acid solution

Adsorption effect of 1‐((2‐hydroxynaphtalen‐1‐yl) (phenyl)methyl)urea on the carbon steel corrosion in hydrochloric acid media

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