Ethanolamines as Corrosion Inhibitors for Zinc in (HNO3+H2SO4) Binary Acid Mixture

Vashi, R. T.; Bhajiwala, H. M.; Desai, S. A.

doi:10.1155/2010/518543

Cited by 15 publications

(14 citation statements)

References 4 publications

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“…2H + + 2e --------> 2H (ads.) (cathodic reaction) (8) or H + H 3 O + + e --------> H 2 ↑ + H 2 O Hydrogen chloride (HCl) is a monoprotic acid, which means it can dissociate (i.e., ionize) only once to give up one H + ion (a single proton). In aqueous hydrochloric acid, the H + joins a water molecule to form a hydronium [19][20] ion, H 3 O + :…”

Section: Mechanism Of Corrosion Inhibitormentioning

confidence: 99%

“…According to Hackerman et al [6][7] the inhibitive properties of a series of secondary aliphatic and cyclic amines in acid media are controlled by the percentage of π -orbital of free electron on the nitrogen atom of these compounds. R.T.Vashi et al [8][9] studied the corrosion inhibitor of zinc in (HNO 3 +HCl) by ethanolamines and by ethylamines. R.T.Vashi et al 10 studied aniline as corrosion inhibitor for zinc in phosphoric acid.…”

Section: Introductionmentioning

confidence: 99%

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Aniline as Corrosion Inhibitor for Zinc in Hydrochloric Acid

Vashi¹,

Desai²

2013

Chem Sci Trans

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The corrosion of zinc in hydrochloric acid containing aniline has been studied at different acid concentrations, inhibitor concentration and temperatures. Corrosion increases with the concentration of acid and the temperature. As the concentration of inhibitor increases Inhibition efficiency (I.E.) also increases. At constant inhibitor concentration, the I.E. decreases with the increase in concentration of acid. As temperature increases, percentage of inhibition decreases. The plot of log (θ/1-θ) versus log C results in a straight line suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anodes as well as cathodes.

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Section: Mechanism Of Corrosion Inhibitormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aniline as Corrosion Inhibitor for Zinc in Hydrochloric Acid

Vashi¹,

Desai²

2013

Chem Sci Trans

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“…The heat of adsorption, (Q ads ), was calculated following Hoar and Holiday equation [21], while the free energy of adsorption, (∆G ads ), was calculated as given by Vashi et al [22]. From the values of (Q ads ) and (∆G ads ), the values of entropy of adsorption (∆S ads ) were also calculated.…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Schiff Bases of Triethylenetetramine as Corrosion Inhibitors of Zinc in Hydrochloric Acid

Shah¹,

Patel²,

Mudaliar³

et al. 2011

Port. Electrochim. Acta

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The performance of triethylenetetramine-tribenzylidene (TTTB) and triethylenetetramine-trisalicylidene (TTTS) as corrosion inhibitors for zinc in hydrochloric acid is investigated. At lower concentrations, both inhibitors accelerate the attack but inhibit corrosion at higher concentrations, e.g., 96-100% with 1.0% concentration in 0.5 M and 1.0 M HCl. The efficiency of TTTB decreases while that of TTTS remains almost constant (≥ 99.7%) up to 120 minutes and in the temperature range 35 -65 ºC. The activation energies are higher in inhibited than in plain acid with both inhibitors. The free energy of adsorption (∆G ads ) and heat of adsorption (Q ads ) are negative, which suggests that there is spontaneous adsorption on metal surface, and from the values of (∆G ads ) and (Q ads ), the values of entropy of adsorption (∆S ads ) were calculated. Galvanostatic polarization shows that corrosion is under mixed control with predominance of the cathodic part. In uninhibited 1.0 M HCl, complete cathodic protection is achieved at a current density of 4.2224 Adm -2 , but in presence of these inhibitors, much lower current densities are required. Plot of log (θ/1-θ) versus log C inh gives a straight line, suggesting that inhibitors cover both the anodic and cathodic regions through general adsorption following Langmuir isotherm. The mechanism of inhibition has been proposed.

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“…Aromatic, aliphatic and heterocyclic amines have been extensively investigated as corrosion inhibitors [1][2][3] . According to Hackerman et al 4 the inhibitive properties of a series of secondary aliphatic and cyclic amines in acid media are controlled by the percentage of π-orbital of free electron on the nitrogen atom of these compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Lin Wang et al 5 has studied the corrosion inhibition of zinc in phosphoric acid solution by 2-mercapto benzimidazole. Vashi et al studied ethanolamines 6 and ethylamines 7 as corrosion inhibitors for zinc in phosphoric acid. Hexamine was reported as effective corrosion inhibitor for various metals in acid.…”

Section: Introductionmentioning

confidence: 99%

Hexamine as Corrosion Inhibitors forZinc in Phosphoric Acid

Vashi¹,

Naik

2010

Journal of Chemistry

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The corrosion of zinc in phosphoric acid containing hexamine has been studied at different acid concentrations, inhibitor concentration and temperatures. Corrosion increases with the concentration of acid and the temperature. The inhibition efficiency (IE) of hexamine increases with the concentration of inhibitor. The IE decreases with the increase in concentration of acid. As temperature increases, percentage of inhibition decreases. The plot of log (Θ/1-Θ)versuslog C results in a straight line suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anodes as well as cathodes.

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Ethanolamines as Corrosion Inhibitors for Zinc in (HNO₃+H₂SO₄) Binary Acid Mixture

Cited by 15 publications

References 4 publications

Aniline as Corrosion Inhibitor for Zinc in Hydrochloric Acid

Aniline as Corrosion Inhibitor for Zinc in Hydrochloric Acid

Schiff Bases of Triethylenetetramine as Corrosion Inhibitors of Zinc in Hydrochloric Acid

Hexamine as Corrosion Inhibitors forZinc in Phosphoric Acid

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