A Comparative Study of the Inhibitory Effect of Gum Exudates from Khaya senegalensis and Albizia ferruginea on the Corrosion of Mild Steel in Hydrochloric Acid Medium (original) (raw)
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ORIENTAL JOURNAL OF CHEMISTRY, 2018
Corrosion mitigation of carbon steel by neem gum (gum exudates of Azadirachta indica) was investigated in 1N HCl medium. Effect of temperature and immersion period towards the mitigation process is studied using weight loss method.Electrochemical studies indicate that corrosion reaction is inhibited by adsorption of gum molecules. Adsorption process is consistent with Langmuir isotherm. The inhibitor behaves as mixed type for carbon steel corrosion in 1N HCl. Surface morphology studies reveal adsorption on the metal surface.
Asian Journal of Chemistry, 2018
Carbon steel finds extensive use in oil refineries, distillation plants petrochemical industries, power plants, gas refineries and ships due to its high strength, low cost and easy accessibility [1]. Nevertheless, a huge problem towards application part of carbon steel is its corrosion especially in acid media. Steel corrosion in acidic medium can be minimized through several approaches. Use of synthetic organic and inorganic compounds as corrosion inhibitors is the well-established method but is much expensive and non-biodegradable. To prevail with the condition, bountiful number of corrosion research studies were done using extracts of different parts of plants, natural products, drugs and biopolymers. Some investigations of gum exudates of trees reported as good inhibitors made in the recent past include gum arabic [2], locust bean gum [3], guar gum [4], albizia gum [5], Raphia hookeri exudate gum [6], Dacryodes edulis gum [7], Ficus glumosa gum [8], Commiphora kerstingii gum [9], Ficus benjamina gum [10], Anogeissus leiocarpus gum [11], Commiphora pendunculata gum [12], Ficus platyphylla gum [13], Ficus trichopoda gum [14], Gloriosa superba gum [15], Khaya ivorensis gum [16], Ficus thonningii gum [17] and Daniella oliveri gum [18]. In general, to improve efficiency of naturally occurring substances, a small addition of halide ions are employed [19-21]. We had reported earlier the use of Azadirachta indica gum for mild steel corrosion in hydrochloric
Corrosion inhibition potential of daniella oliverri gum exudate for mild steel in acidic medium
International Journal of Electrochemical Science, 2012
Physicochemical parameters of Daniella olliverri (DO) gum exudates were analyzed and the results indicated that the gum is acidic, brownish in colour, ionic and highly soluble in water but insoluble in acetone, chloroform and ethanol. GCMS spectrum of the gum indicated the presence of sucrose, dihex-5-en-2-yl phthalate, stearic acid, 2,6-dimethyl-4-nitrophenol and (E)-hexadec-9-enoic acid. Corrosion inhibition potential of the gum was investigated using weight loss and FTIR methods. Daniella olliverri gum has been found to be a good inhibitor for the corrosion of mild steel in HCl solution. Corrosion inhibition properties of the gum is attributed to the presence of aromatic, suitable functional groups and heteroatoms in its chemical constituents, which facilitated its adsorption. The adsorption of the gum on the surface of the metal was found to be endothermic, spontaneous and supported the mechanism of physical adsorption. The results obtained obeyed the Langmuir adsorption isotherm model.
Corrosion Inhibition of Mild Steel in 1 mol L−1 HCl Using Gum Exudates of Azadirachta indica
Advances in Physical Chemistry, 2016
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.
The corrosion and inhibition behaviours of mild steel in sulphuric acid in the presence of Albizia zygia gum (AZ) have been studied using the weight loss, gasometric, Fourier transform infrared (FTIR) and thermometric techniques. The temperature studies reflect that the percentage of inhibition efficiency is decreased with rise in temperature and that indicates the mechanism of physical adsorption. The calculated values of activation energy (E a) also support the physisorption process. The thermodynamic parameters such as heat of adsorption (Q ads) and free energy of adsorption (ΔG ads) are suggested that the adsorption of inhibitor on the mild steel surface is exothermic and followed by spontaneous process. The adsorption of the inhibitor on mild steel surface involves the formation of multimolecular layer through C-H bending vibrations due to alkenes at 703.08 and 933.58.01 cm-1 , CO stretches due to carboxylic acid, ester, ether and alcohol at 1084.03 and 1150.58 cm-1 , CO stretch due to ketone /aldehyde/carboxylic acid at 1826.65 cm-1 , C-H aliphatic stretch at 2820.99 cm-1 and C-H stretch at 3026.41.79 cm-1 , which support physical adsorption. The observed results indicate that A. zygia gum could serve as an effective inhibitor on mild steel in sulphuric acid.
Exudate Gum from Acacia Trees as Green Corrosion Inhibitor for Mild Steel in Acidic Media
2012
The inhibition effect of exudate gum from Acacia trees (Gum Acacia, GA) on the corrosion of mild steel in acidic media was studied by weight loss, hydrogen evolution, and electrochemical polarization methods; also, surface morphology was analyzed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques. The results of weight loss, hydrogen evolution, and electrochemical polarization methods indicated that inhibitor efficiency (I%) increased with increasing inhibitor concentration. The inhibitor efficiency (I%) in hydrochloric acid is much more than those in sulfuric acid due to the synergistic effect. The percentage inhibition efficiency (I%) of steel corrosion with GA is highly increased in the presence of an external magnetic field. Results of weight loss method are highly consistent with those obtained by hydrogen evolution method, and both indicate that inhibitor efficiency increases with increasing inhibitor concentration and the presence of external magnetic field. Electrochemical polarization studies showed that Gum Acacia acts as mixed type inhibitors. The results reveal that Gum Acacia provided a very good protection to mild steel against corrosion in acidic media. FTIR, SEM and XPS confirmed the existence of an absorbed protective film on the mild steel surface.
Int. J. Electrochem. …, 2008
The effect of naturally occurring exudate gum from Raphia hookeri (RH) on the corrosion of mild steel in H 2 SO4 in the temperature range 30-60 o C was studied by weight loss and hydrogen evolution techniques. Results obtained reveal that the exudate gum reduces the corrosion rate. The inhibition efficiency increased with an increase in exudate gum content up to 5g/l to reach 70% at 30 o C and decreases with increase in temperature. The adsorption of exudate gum from Raphia hookeri on the mild steel follows Langmuir adsorption isotherm. Results obtained by weight loss and hydrogen evolution technique are in good agreement. The addition of halide ions to the exudate gum enhanced the inhibition efficiency due to synergistic effect. Mechanism of physical adsorption is proposed from the apparent activation energy (E a ) and the thermodynamic parameters obtained. The adsorption of the exudate gum on the mild steel surface is spontaneous.
Inhibitory action of Albizia zygia gum on mild steel corrosion in acid medium
African Journal of Pure and Applied Chemistry, 2014
The corrosion and inhibition behaviours of mild steel in sulphuric acid in the presence of Albizia zygia gum (AZ) have been studied using the weight loss, gasometric, Fourier transform infrared (FTIR) and thermometric techniques. The temperature studies reflect that the percentage of inhibition efficiency is decreased with rise in temperature and that indicates the mechanism of physical adsorption. The calculated values of activation energy (E a) also support the physisorption process. The thermodynamic parameters such as heat of adsorption (Q ads) and free energy of adsorption (ΔG ads) are suggested that the adsorption of inhibitor on the mild steel surface is exothermic and followed by spontaneous process. The adsorption of the inhibitor on mild steel surface involves the formation of multimolecular layer through C-H bending vibrations due to alkenes at 703.08 and 933.58.01 cm-1 , CO stretches due to carboxylic acid, ester, ether and alcohol at 1084.03 and 1150.58 cm-1 , CO stretch due to ketone /aldehyde/carboxylic acid at 1826.65 cm-1 , C-H aliphatic stretch at 2820.99 cm-1 and C-H stretch at 3026.41.79 cm-1 , which support physical adsorption. The observed results indicate that A. zygia gum could serve as an effective inhibitor on mild steel in sulphuric acid.
Communication in Physical Science, 2021
The corrosion inhibition of stainless steel arch bar (an implant used for maxillo-mandibular fixation in dentistry) by Khaya grandifolia gum exudates in 1.00 x 10-4 moldm-3 HCl solution and pH of 4.0 was studied using weight loss method (gravimetric analysis). The corrosion rate decreased in the presence of the gum exudate while the inhibition efficiency was observed to increase with an increase in the concentration of the gum exudate. Variation of the inhibition efficiency with time showed a decreasing trend, FTIR analysis of the gum exudate (crude and in HCl) showed the presence of some functional groups that might have been used in adsorbing the inhibitor unto the surface of the metal. The observed functional groups included OH stretch, C=C, C=N, or C=O functional groups and CC , C-N, and CO due to carboxylic acid stretching or alcohol bonds in the gum. Surface analysis showed remarkable improvement on the surface, in the presence of the inhibitor than in its absence.
Tanzania Journal of Science, 2009
The inhibitive performance of gum exudates from Acacia drepanolobium and Acacia senegal from Tanzania, towards the corrosion of mild steel in fresh water has been investigated. The experimental methods include potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies. The results indicate that gum exudates (Acacia drepanolobium and Acacia senegal) exhibit good inhibition characteristics to corrosion on mild steel under fresh water medium and the inhibition efficiency of up to 90.7% and 99.7% respectively was attained at 30 o C. Furthermore, the studies have shown that the inhibition performance remained above 90% on both Acacia exudates independent of the raise in temperature. Polarization measurements revealed that the investigated inhibitors are mixed type for mild steel corrosion in fresh water with significant reduction of anodic current densities (this sentence is not clear). The results obtained in this work show that these gum exudates of Acacia senegal and Acacia drepanolobium can serve as effective green inhibitors for the corrosion of mild steel in fresh water systems.