scholarly journals PHYTOCHEMICALS AND INHIBITIVE PROPERTIES OF CASHEW EXTRACT AS CORROSION INHIBITOR OF ALUMINIUM IN H2SO4 MEDIUM

2019 ◽  
Vol 49 (2) ◽  
pp. 99-103
Author(s):  
M. OMOTIOMA ◽  
O. D. ONUKWULI ◽  
I. OBIORA- OKAFO
Keyword(s):  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Control Process ◽  
Quadratic Model ◽  
Qualitative And Quantitative ◽  
Quantitative Analyses ◽  
High Inhibition

This work studied the phytochemicals and inhibitive properties of cashew extract as corrosion inhibitor of aluminium in H2SO4 medium. Qualitative and quantitative analyses of the cashew extract were carried out to identify and quantify the phytochemicals for the corrosion inhibition process. Thermometric and gravimetric techniques were employed in the study of corrosion inhibition of aluminium in H2SO4 medium. The inhibition efficiency of the cashew extract was modeled using Response Surface Methodology (RSM) of Design Expert Software 9. It was revealed that phytochemicals of alkaloids, cardiac glycosides, flavonoids, phenolics, phytates, saponins and tanins were present in the cashew extract at various degrees. The cashew extract is predominantly made of flavonoids (425.0mg/100g) followed by alkaloids (221.7mg/100g).Adsorption of the cashew extract on the Al surface obeyed physical adsorption mechanism. Thermometric and gravimetric techniques are in agreement of recording high inhibition efficiencies of 83.7% and 82.5% respectively. The phytochemicals of the cashew extract are good inhibitive agents for the corrosion control process. A quadratic model is adequate for the description of the inhibition efficiency of the cashew extract as a function of inhibitor concentration, temperature and time.

scholarly journals Emblica Officinalis (Indian Gooseberry) Leaves Extract as Corrosion Inhibitor for Mild Steel in 1N HCl Medium

2010 ◽  
Vol 7 (3) ◽  
pp. 677-684 ◽  
Author(s):  
R. Saratha ◽  
V. G. Vasudha
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Emblica Officinalis ◽  
Indian Gooseberry ◽  
Plant Constituents ◽  
Corrosion Inhibition Efficiency ◽  
Hcl Medium

Corrosion inhibition efficiency of acid extract of dryEmblica officinalisleaves for mild steel in 1N HCl medium is investigated in the present study. Experimental methods include weight loss, potentiodynamic polarization and impedance studies. The results indicateEmblica officinalisleaves to be a good corrosion inhibitor of a mixed type and having efficiency of 87.9% at 2% v/v inhibitor concentration. Corrosion inhibition may be due to the spontaneous physical adsorption of the plant constituents on the mild steel surface. Experimental data fitted the Langmuir, Temkin, Freundlich and Flory-Huggins adsorption isotherms.

scholarly journals Phytoconstituents of Methanolic Extract of Fenugreek Seeds as a Green Corrosion Inhibitor of Metals (Fe, Al and Cu)

2021 ◽  
Vol 4 (Vol4) ◽  
pp. 24-30
Author(s):  
Ghassab Al-Mazaideh
Keyword(s):  
Corrosion Inhibition ◽  
Chemical Structure ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Significant Inhibition ◽  
Metal Corrosion ◽  
Electrophilicity Index ◽  
Green Corrosion Inhibitor ◽  
Gibbs Process

DFT calculations were carried out on significant Fenugreek seed compounds (1-Methylpyridinium-3-carboxylate MPC, Apigenin-8-C-glucose ACG, and 2-Isobutyl-3-methoxypyrazine IBMP) as a green source of ecologically friendly Fe, Al, and Cu metal corrosion inhibitors. Complete geometry optimizations were performed by DFT-B3LYP/6-31G* to determine any relationship between the chemical structure and corrosion inhibition, mostly on metals' surfaces. Global computational parameters of the inhibitors and thermodynamic Gibbs process of adsorption of metals were calculated and used to evaluate each corrosion inhibitor's performance. Our findings showed that MPC has the maximum anti-corrosion efficiency across all molecules with a physical adsorption mechanism. It exhibited significant inhibition efficiency with Cu when compared with Fe and Al, based on the highest electrophilicity index (ω) values compared to other inhibitors and its impact on metals in the following manner: Cu>Fe>Al. In regards, the range of inhibitors increased by the following order: IBMP>ACG>MPC. Remarkable corrosion inhibition of MPC is demonstrated by its unique high electrophilicity, softness (σ), and lowest ∆Egap on the metal surface. These outcomes are close to the experimental

scholarly journals Corrosion Inhibition and Adsorption Characteristics of Tarivid on Mild Steel in H2SO4

2010 ◽  
Vol 7 (s1) ◽  
pp. S442-S448 ◽  
Author(s):  
N. O. Eddy ◽  
E. E. Ebenso
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Free Energy Of Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics ◽  
Kinetic And Thermodynamic Parameters ◽  
Temperature Activation

The corrosion inhibition and adsorption characteristics of (+/-)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid (Tarivid) on the corrosion of mild steel has been studied using thermometric and gasometric methods. The study reveals that tarivid inhibits the corrosion of mild steel in H2SO4. The values of inhibition efficiency of tarivid were found to increase as its concentration increased but decreased with increase in temperature. Activation energies of the inhibited corrosion of mild steel ranged from 39.05 to 50.61 kJ/mol. Values of enthalpy change and free energy of adsorption were negative which indicated exothermic and spontaneous adsorption process. Physical adsorption mechanism is proposed from the obtained kinetic and thermodynamic parameters. Langmuir adsorption isotherm model is obeyed from the fit of the experimental data.

scholarly journals New Aromatic Azo-Schiff as Carbon Steel Corrosion Inhibitor in 1 M H2SO4

2018 ◽  
Vol 34 (5) ◽  
pp. 2471-2476 ◽  
Author(s):  
Hamida Edan Salman ◽  
Asim A. Balakit ◽  
Ali Ahmed Abdulridha
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Steel Corrosion ◽  
Spectroscopic Techniques ◽  
Different Temperatures ◽  
Corrosion Inhibition Efficiency

A new aromatic Schiff base with azo linkage (AS) has been synthesized and characterized by FT-IR, 1H NMR and 13C NMR spectroscopic techniques. The new compound (AS) has been evaluated as carbon steel corrosion inhibitor at different concentrations (0.005, 0.01, 0.02, 0.04 and 0.08 mM) and different temperatures (303 – 333 K). The corrosion inhibition efficiency was studied by potentiodynamic polarization and weight loss measurements. The effects of concentration and temperature on the inhibition efficiency were studied by potentiodynamic polarization studies, the results showed that increasing concentration of AS increases the inhibition efficiency while increasing the temperature decreases it, the highest corrosion inhibition efficiency, 93.9% was recorded with 0.08 mM of AS at 313 K in 1 M H2SO4. Weight loss measurements showed that the inhibition efficiency reached 97.1% in the presence of AS (0.08 mM) at 313 K. The adsorption process was found to obey Langmuir isotherm, and the adsorption thermodynamic parameters were studied. Scanning electron microscope (SEM) was used to confirm the results.

Modification of Ligustrum vulgare Leaves Extract as Eco-Friendly Corrosion Inhibitors in Oil Fields

2019 ◽  
Vol 814 ◽  
pp. 499-504
Author(s):  
Ren Jun Xu ◽  
Hua Lei He ◽  
Ying Li Tang ◽  
Min Lan Gao ◽  
Hai Peng Hui ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Oil Fields ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Ligustrum Vulgare ◽  
Main Components ◽  
Dark Green

Ligustrum vulgare is an evergreen tree. The leaves are opposite, glossy dark green, 6–17 centimetres (2.4–6.7 in) long and 3–8 centimetres (1.2–3.1 in) broad. The ligustrum vulgare leaves contain two main components, one of which is oleanolic acid and the other is p-hydroxyphenylethanol which indicates its extracts suitable to be used as an effective corrosion inhibitor. Extracts of ligustrum vulgare leaves (PE) were modified with hydroxymethylation reaction (PM1) and Mannich reaction (PM2) to produce the relative stable green acidic corrosion inhibitors. The extracts of ligustrum vulgare leaves have been investigated on the corrosion inhibition of A3 steel with weight loss. The results show that these inhibitors have good corrosion inhibition effect on A3 steel. The PM2 are the most effective for corrosion inhibition, and the inhibition efficiency can reach 75.95%. When the temperature is 60°C, the corrosion inhibition rate of PE, PM1, PM2 is only 24.46%, 42.35% and 39.35% respectively which can not effectively prevent the corrosion of the metal. And the extracts inhibit corrosion mainly by adsorption mechanism. This adsorption accords with Langmuir adsorption isotherm.

Experimental Investigation of a New Derived Oleochemical Corrosion Inhibitor

2019 ◽  
Vol 796 ◽  
pp. 112-120
Author(s):  
Mysara Eissa Mohyaldinn ◽  
Wai Lin ◽  
Ola Gawi ◽  
Mokhtar Che Ismail ◽  
Quosay A. Ahmed ◽  
...  
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Dynamic Condition ◽  
Methyl Esters ◽  
Static Condition ◽  
Chemical Corrosion ◽  
Boron Fluoride

Most of the corrosion inhibitors that are used in industry contain chemicals that are harmful to health and environment. Corrosion inhibitors derived from green sources are, therefore, believed to be a good option for replacing the chemical corrosion inhibitors. In this work, a green oleochemical corrosion inhibitor derived from Jatropha Curcas is introduced. The paper discusses the methodology of deriving the corrosion inhibitor as well as the experimental test conducted for evaluating its corrosion inhibition efficiency. The new oleochemical corrosion inhibitor was derived via two reactions. Jatropha oil was firstly saponified with sodium hydroxide to yield gras acid and glycerol, which was then esterified with boron fluoride in presence of excess methanol to produce the oil methyl esters, which is used as oleo-chemical corrosion inhibitor. To evaluate the oleo-chemical corrosion inhibitor, the corrosion rate of mild steel in NaCl corrosive medium with CO2 is tested at static condition and two dynamic conditions, namely 500 and 1500 rpm. This is to simulate the transitional and turbulent flow in a pipeline. At each dynamic condition, the proposed corrosion inhibitor was tested at concentration dosages of 0, 50, 100, and 150 ppm. The experiments results revealed a good performance of the new oleochemical corrosion inhibitor. The inhibition efficiency was found to be highly affected by the concentration of corrosion inhibitor. Total corrosion inhibition of the mild steel was noticed by using 150 ppm at dynamic condition of 500 rpm.

Corrosion Inhibition Effects and Adsorption Characteristics of Ethanol Extract of King Bitters Root (Andrographis paniculata) on Mild Steel in Hydrochloric and Tetraoxosulphate (VI) Acid Media

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
B U Ugi
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Elevated Temperatures ◽  
Physical Adsorption ◽  
Activation Parameters ◽  
Ethanol Extract ◽  
Andrographis Paniculata ◽  
Inhibition Mechanism ◽  
Acid Media

The corrosion inhibition performance of ethanol extract of Andrographis paniculata (King Bitter) root (EEAPR) on the corrosion of Mild Steel (MS) in 1.0 M HCl and H2SO4 acid solutions at 303K and elevated temperatures of 313, 323 and 333K was investigated and compared. The experimental work was performed by the use of weight loss and hydrogen evolution techniques. The results indicate that the extract inhibit the corrosion of mild steel in both acid media. However, the EEAPR exhibits higher maximum inhibition efficiency of 98.9 % in HCl than in H2SO4 (95.0 %) at 5.0 g/L. Inhibition efficiency was found to increase with increasing concentration of extract in both acid media but decreased with rise in temperature. Inhibition mechanism was deduced from the temperature dependence of the inhibition efficiency as well as from activation parameters that govern the process. Adsorption of extract on the MS sample in both acid media was found to obey the Langmuir adsorption isotherm. The phenomenon of physical adsorption is proposed from the obtained thermodynamic parameters.Â

Computational Calculations, Gravimetrical, and Surface Morphological Investigations of Corrosion Inhibition Effect of Triazole Derivative on Mild Steel in HCl

2020 ◽  
Vol 17 (7) ◽  
pp. 2897-2904
Author(s):  
Shaimaa B. Al-Baghdadi ◽  
Ahmed A. Al-Amiery ◽  
Abdul A. Kadhum ◽  
Mohd Sobri Takriff
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Inhibition Efficiency ◽  
The Novel ◽  
Langmuir Adsorption ◽  
Computational Calculations ◽  
Acid Environment ◽  
Experimental Findings ◽  
High Inhibition

The inhibition efficiency of the novel synthesized corrosion inhibitor namely, 5,5’-(1,4-phenylene)bis(3-mercapto-4-methyl-1,2,4-triazole) (PBMMT) have been studied for mild steel in 1 M hydrochloric acid environment by using gravimetric techniques. PBMMT show high inhibition efficiency at 0.5 mM. The adsorption isotherm of the investigated inhibitor on the surface of mild steel obeys Langmuir adsorption isotherm. The surface morphology was tested by scanning electron microscopy (SEM) in the absence and presence of PBMMT as corrosion inhibitor. The results show that the mild steel surface in presence of PBMMT 0.5 mM was smooth and uncorroded in 1 M HCl solution. Quantum chemical calculations were quite fitted with the experimental findings.

scholarly journals A Revisit to the Corrosion Inhibition of Aluminum in Aqueous Alkaline Solutions by Water-Soluble Alginates and Pectates as Anionic Polyelectrolyte Inhibitors

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Refat Hassan ◽  
Ishaq Zaafarany ◽  
Adil Gobouri ◽  
Hideo Takagi
Keyword(s):  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Geometrical Structure ◽  
Physical Adsorption ◽  
Water Soluble ◽  
Alkaline Media ◽  
Alkaline Solutions ◽  
Corrosion Mechanism ◽  
Natural Polymer ◽  
Freundlich Isotherms

The corrosion behavior of aluminum (Al) in alkaline media in presence of some natural polymer inhibitors has been reinvestigated. The inhibition action of the tested inhibitors was found to obey both Langmuir and Freundlich isotherms models. The inhibition efficiency was found to increase with increasing the inhibitors concentration and decrease with increasing the temperature, suggesting physical adsorption mechanism. Factors such as the concentration and geometrical structure of the inhibitor, concentration of the corrosive medium, and temperature affecting the corrosion rates were examined. The kinetic parameters were evaluated, and a suitable corrosion mechanism consistent with the kinetic results obtained is suggested and discussed.

Inhibition Action and Adsorption Behavior of 3-Amino-1,2,4-Triazole on Copper in 3% NaCl Solution

2010 ◽  
Vol 148-149 ◽  
pp. 1343-1346 ◽  
Author(s):  
Qun Jie Xu ◽  
Si Jing Ding ◽  
Hong Yun ◽  
Shi Feng Shi
Keyword(s):  
Adsorption Isotherm ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Ac Impedance ◽  
Adsorption Behavior ◽  
Nacl Solution ◽  
Maximum Value ◽  
Dc Polarization

The corrosion inhibition of copper in 3% NaCl solution by 3-amino-1, 2, 4-triazole (ATA) has been studied in relation to the concentration of the inhibitor using electrochemical (AC impedance and dc polarization) techniques. The results indicate that ATA has good corrosion inhibition for copper in 3% NaCl solution. The inhibition efficiency attains the maximum value of 97.65% when the concentration of ATA is 20 mg•L-1.Polarisation curves show that ATA behaves as a type of cathodal inhibition in 3% NaCl solution. Adsorption of the ATA is found to follow the Langmuir’s adsorption isotherm, and the adsorption mechanism is typical of chemisorption.

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