ADSORPTION AND QUANTUM CHEMICAL STUDIES ON THE INHIBITION OF THE CORROSION OF ALUMINUM IN HCL BY<i>GLORIOSA SUPERBA</i>(GS) GUM

Eddy, Nnabuk Okon; Ibok, U. J.; Ameh, Paul Ocheje; Alobi, N O; Sambo, Musa M.

doi:10.1080/00986445.2013.809000

Cited by 20 publications

(10 citation statements)

References 25 publications

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“…This gum was reported as a corrosion inhibitor for Al in HCl medium by using FTIR, GCMS techniques. Obtained results show that initial adsorption of FT gum shows the physical adsorption and it is succeeded by the chemical adsorption mechanism so it represents both types of mechanism and is found to obey the Langmuir adsorption isotherm [60].…”

Section: Gloriosa Superba Gummentioning

confidence: 94%

Use of natural gums as green corrosion inhibitors: an overview

2015

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Corrosion of metals and its alloys employed in service is an inescapable but a controllable process. One of the practical methods for controlling the impact of corrosion of metals and alloys especially in aqueous environments is by using corrosion inhibitors which are composed mainly of organic or inorganic substances. However, the toxicity of organic and inorganic corrosion inhibitors to the environment and humans has compelled the search for safer corrosion inhibitors called 'green corrosion' inhibitor due to their properties like non-toxicity, biodegradability, and low cost. The use of natural gums as environmentally safe corrosion inhibitor for metal and alloys has in recent times received tremendous attention by several researchers. Also quantitative structure activity relationship approach has been used to establish the correlations between a number of quantum chemical parameters and the molecular structures of some gum extracts major components. This approach has aided in understanding the component of the gum extracts responsible for imparting the inhibition effect since there are several components of the gum which could act in synergy to inhibit the metal corrosion. This review paper presents an overview of works published on natural gums as green corrosion inhibitors. It also discusses the use of computational chemistry tools in understanding the inhibition mechanism of gum extracts components which is often difficult to determine using experimental means.

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Section: Gloriosa Superba Gummentioning

confidence: 94%

Use of natural gums as green corrosion inhibitors: an overview

2015

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“…Inhibitor-metal specimen interaction was determined using a Shimadzu FT-IR 8000 spectrophotometer in the 4000-400 cm −1 region with KBr disc technique. (10,20,40, and 60 ppm) on mild steel in 1 mol L −1 HCl has been studied in the temperature range of 303-323 K for various immersion periods (1, 2, 4, 6, and 12 h) using the gravimetric method. The corrosion rate, surface coverage, and inhibition efficiency were calculated by means of (1), (2), and (3) and the data obtained are given in Table 1.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…Several investigations were made using Gum Arabic [7], Locust Bean gum [8], Guar gum [9] Albizia gum [10], Raphia hookeri exudate gum [11], Dacryodes edulis gum [12], Ficus glumosa gum [13], Commiphora kerstingii gum [14], Ficus benjamina gum [15], Anogeissus leiocarpus gum [16], Commiphora pedunculata gum [17], Ficus platyphylla gum [18], Ficus trichopoda gum [19], Gloriosa superba gum [20], Khaya ivorensis gum [21], Ficus thonningii gum [22], and Daniella oliveri gum [23] as corrosion inhibitors. In our attempt to explore environmentally safe green inhibitors, 2 Advances in Physical Chemistry gum exudates of Azadirachta indica were used to investigate the corrosion behavior of mild steel in 1 M HCl solution.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition of Mild Steel in 1 mol L⁻¹ HCl Using Gum Exudates of Azadirachta indica

Manickam

Dheenadhayalan

Thirumalairaj

et al. 2016

Advances in Physical Chemistry

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The ability of gum exudates of Azadirachta indica (GAI) to inhibit corrosion on mild steel in 1 mol L−1 HCl has been studied using mass loss, polarization, and impedence measurements. The effect of temperature (303–323 K) and immersion time of 1, 2, 4, 6, and 12 hours on corrosion behavior of mild steel was examined. Gum exudates decrease the corrosion rate up to a concentration of 80 ppm and at 323 K temperature. GAI adsorb chemically onto the surface of the mild steel while it obeys Langmuir adsorption isotherms. Polarization studies show GAI as mixed mode inhibitor. Surface studies ascertain that a shielding layer was formed on the mild steel surface.

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“…The Fukui function considers nucleophilic and electrophilic reactivity of an inhibitor in terms of local reactivity, that residing in a given atom or bond in the inhibitor's molecule. According to Eddy et al [18], the Fukui function can formally be defined as…”

Section: Quantum Chemical Studymentioning

confidence: 99%

Experimental and Quantum Chemical Studies on the Corrosion Inhibition Potential of Phthalic Acid for Mild Steel in 0.1 M H2SO4

PO¹

2015

Chem Sci J

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The corrosion inhibition potential of phthalic acid for mild steel in 0.1 M sulphuric acid was studied using experimental (weight loss, gasometric, FTIR and Scanning electron microscopy) and theoretical (semi empirical, Ab initio and DFT) approaches. Results obtained from weight loss measurements indicated that phthalic acid inhibited the corrosion of mild steel and recorded average and instantaneous maximum inhibition efficiencies of 55.48 and 87.34% at 303 K and at a concentration of 0.1 M respectively. Thermodynamic/adsorption considerations revealed that the adsorption of the inhibitor is exothermic, spontaneous and supported the mechanism of physical adsorption. The adsorption behaviour of the inhibitor was best described by the Langmuir adsorption model. FTIR spectra obtained from the corrosion product of mild steel in the absence and presence of the inhibitor revealed the existence of interaction between the inhibitor and the metal surface due to some shifts in the functional groups of the compound after adsorption. Scanning electron micrographs of the corroded metal (in the absence and presence of the inhibitor) revealed that phthalic acid prevented the corrosion of mild steel by forming protective coverage on the surface of the metal. Calculated quantum chemical parameters were found to be in good agreement with those reported for some good corrosion inhibitors. Although results obtained from Ab initio calculations for condensed Fukui functions were slightly at variance with those obtained from DFT calculations, considerations of Huckel charges on the atoms of the molecule, bond length, HOMO and LUMO molecular orbital plots clearly supported DFT results which indicated that the sites for nucleophilic and electrophilic attacks corresponded to atoms O(11) and C(4) respectively.

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ADSORPTION AND QUANTUM CHEMICAL STUDIES ON THE INHIBITION OF THE CORROSION OF ALUMINUM IN HCL BYGLORIOSA SUPERBA(GS) GUM

Cited by 20 publications

References 25 publications

Use of natural gums as green corrosion inhibitors: an overview

Use of natural gums as green corrosion inhibitors: an overview

Corrosion Inhibition of Mild Steel in 1 mol L⁻¹ HCl Using Gum Exudates of Azadirachta indica

Experimental and Quantum Chemical Studies on the Corrosion Inhibition Potential of Phthalic Acid for Mild Steel in 0.1 M H2SO4

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ADSORPTION AND QUANTUM CHEMICAL STUDIES ON THE INHIBITION OF THE CORROSION OF ALUMINUM IN HCL BYGLORIOSA SUPERBA(GS) GUM

Cited by 20 publications

References 25 publications

Use of natural gums as green corrosion inhibitors: an overview

Use of natural gums as green corrosion inhibitors: an overview

Corrosion Inhibition of Mild Steel in 1 mol L−1 HCl Using Gum Exudates of Azadirachta indica

Experimental and Quantum Chemical Studies on the Corrosion Inhibition Potential of Phthalic Acid for Mild Steel in 0.1 M H2SO4

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Corrosion Inhibition of Mild Steel in 1 mol L⁻¹ HCl Using Gum Exudates of Azadirachta indica