Corrosion Inhibition and Adsorption Behavior of Malachite Green Dye on Aluminum Corrosion

Oguzie, Emeka E.; Akalezi, Chris O.; Enenebeaku, Conrad K.; Aneke, J. N.

doi:10.1080/00986445.2010.493118

Cited by 25 publications

(10 citation statements)

References 38 publications

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“…The major driving force of quantum chemical research is to understand and explain the functions of ethyl hydroxyethyl cellulose in molecular forms. Among quantum chemical methods for evaluation of corrosion inhibitors, density functional theory (DFT) has shown significant promise [21][22][23] and appears to be adequate for pointing out the changes in electronic structure responsible for inhibitory action. The geometry of the inhibitor is in ground state, as well as the nature of their molecular orbitals, HOMO (the highest occupied molecular orbital) and LUMO (the lowest unoccupied molecular orbital), that are involved in the properties of activity of inhibitors [24,25].…”

Section: Introductionmentioning

confidence: 99%

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Arukalam

Madu

Ijomah

et al. 2014

Journal of Materials

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The corrosion inhibition of mild steel in 1.0 M H2SO4 solution by ethyl hydroxyethyl cellulose has been studied in relation to the concentration of the additive using weight loss measurement, EIS, polarization, and quantum chemical calculation techniques. The results indicate that EHEC inhibited corrosion reaction in the acid medium and inhibition efficiency increased with EHEC concentration. Further increase in inhibition efficiency is observed in the presence of iodide ions, due to synergistic effect. Impedance results reveal that EHEC is adsorbed on the corroding metal surface. Adsorption followed a modified Langmuir isotherm, with very high negative values of the free energy of adsorption (ΔGads). The polarization data indicate that the inhibitor was of mixed type, with predominant effect on the cathodic partial reaction. The frontier molecular orbitals, HOMO (the highest occupied molecular orbital) and LUMO (the lowest unoccupied molecular orbital) as well as local reactivity of the EHEC molecule, were analyzed theoretically using the density functional theory to explain the adsorption characteristics at a molecular level. The theoretical predictions showed good agreement with experimental results.

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Section: Introductionmentioning

confidence: 99%

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Arukalam

Madu

Ijomah

et al. 2014

Journal of Materials

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“…Oguzie et al 109 reported that Malachite green dye, especially at high concentrations, is an effective corrosion inhibitor for AA1060 aluminium alloy (98.8% aluminium) in aerated 1 M HCl solution at 30-60 °C, using the WL technique. The inhibition effectiveness increased with increasing Malachite green dye concentration, but decreased with increasing temperature.…”

Section: Organic Corrosion Inhibitors In Hcl Solutionmentioning

confidence: 99%

Organic corrosion inhibitors for aluminium and its alloys in acid solutions: a review

2016

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The aim of this review is to summarise the research work published in the last two decades on the use of organic compounds as corrosion inhibitors for aluminium and its alloys in acidic solutions. The focus is on HCl and H 2 SO 4 solutions due to their extensive use in different applications, such as chemical and electrochemical etching, acid cleaning, anodising, and acid pickling of aluminium. Other acids are also reviewed. The inhibition effectiveness of numerous organic compounds and their possible inhibition type and mechanism are also discussed. Electrochemistry is mainly used to investigate inhibitor performance. permanent contact of aluminium (or an alloy of aluminium) with a certain solution. This type of corrosion is especially frequent in chloride solutions. Corrosion protectionThere are several methods to protect aluminium and its alloys, among which the anodising process, conversion coatings, paints, organic coatings, and corrosion inhibitors are found to be the most effective.Anodising is an electrochemical process to increase the thickness of aluminium oxide, where aluminium metallic material is connected as an anode in the electrolytic cell. The anodised oxide layer is thus thicker (5-30 μm) than the natural oxide layer 2, 3, 10, 13, 14 .Conversion coating consist of poorly soluble phosphate or chromium oxides, which are tightly bound to the surface of aluminium or its alloys 15-17 . These coatings affect the appearance, corrosion potential, electrical resistance, and other surface properties. Conversion coatings are formed via a chemical oxidation-reduction process on the metal surface. However, the drawback of these coatings and the accompanying procedures is their negative environmental impact 2 . Therefore, in recent years increasing interest has been shown in conversion coatings containing cerium 18-23 and metallic ions 24-28 or their combination 29, 30 .As mentioned above, another method of corrosion protection is to employ organic coatings. Before applying the organic coating, the aluminium surface should be cleaned and prepared. The process consists of degreasing the surface, followed by removal of the existing oxide layer and the application of the base layer and the primer. The surface cleaning and treatment influences the adhesion and anticorrosion properties of these coatings 31, 32 . The final layer is selected depending on the environmental conditions in which the product will be used [33][34][35][36] . The use of organic-inorganic coatings in the protection of aluminium and its alloys has been also studied 37-39 . Corrosion inhibitorsCorrosion inhibitors modify the metal surface either by forming insoluble compounds with aluminium or by forming a protective surface layer. Based on the electrochemical mechanism of action, the inhibitors can be classified as mixed-type inhibitors (inhibiting both cathodic and anodic reactions of the corrosion couple), anodic-type inhibitors (inhibiting the anodic reaction), or cathodic-type inhibitors (inhibiting the cathodic reaction). Inhibitors may ...

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“…amounts of the inhibitor have been utilized to demonstrate the best isotherm to locate the adsorption behavior. The adsorption isotherms of Frumkin [1], Temkin [18], Flory-Huggin [7], Langmuir [19], and Freundlich [20] were fitted to . The correlation coefficient 2 was utilized to compare all these models to choose the best isotherm.…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…Most of the acid inhibitors are organic materials with N, S, and O atoms and various bonds in their structure. In addition, many N-heterocyclic compounds have been reported as effective inhibitors for metals corrosion and alloys in aqueous media [2][3][4][5][6][7]. The absorption of inhibitors on metal surfaces leads to coverage of active sites of metal surface and thereby leads to a decrease in the metal corrosion rate.…”

Section: Introductionmentioning

confidence: 99%

Natural Polymer of Iraqi Apricot Tree Gum as a Novel Corrosion Inhibitor for Mild Steel in 1 M HCl Solution

Alwaan

Mahdi

2016

International Journal of Chemical Engineering

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Corrosion inhibition of mild steel in 1 M hydrochloric acid using Iraqi apricot tree gum Arabic as natural polymer was studied. The weight loss method was used to predict the efficiency of the inhibitor on corrosion of mild steel in a temperature range of 17–40°C. The FTIR result of natural polymer revealed that the C=O and O-H groups were found in the structure of the natural polymer. The results of weight loss method showed that the inhibition efficiency (I%) increased with the increase in both the natural polymer concentration and the temperature; therefore, chemical adsorption mechanism was suggested in this system. The different mathematical models of the adsorption isotherms were studied and the results revealed that natural polymer was found to obey Temkin, Langmuir, and Freundlich adsorption isotherm. The activation energy of adsorption, enthalpy of adsorption, and entropy of adsorption were obtained for different concentrations of natural polymer (0, 0.1, 0.2, and 0.3 g/L) and the results showed that the thermodynamic properties decreased with the loading of a natural polymer. Gibbs free energy of adsorption results was a minus value that led to the conclusion of the spontaneous adsorption of the natural polymer in this system.

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Corrosion Inhibition and Adsorption Behavior of Malachite Green Dye on Aluminum Corrosion

Cited by 25 publications

References 38 publications

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Organic corrosion inhibitors for aluminium and its alloys in acid solutions: a review

Natural Polymer of Iraqi Apricot Tree Gum as a Novel Corrosion Inhibitor for Mild Steel in 1 M HCl Solution

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