scholarly journals Comparative analysis of adsorption and corrosion inhibitive properties of ethanol extract of Dialium Guineense leaves for mild steel in 0.5 M HCl

2018 ◽  
Author(s):  
Shola Elijah Adeniji ◽  
Bamigbola Abiola Akindehinde
Keyword(s):  
Mild Steel ◽  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Gravimetric Method ◽  
Ethanol Extract ◽  
Pseudo First Order Reaction ◽  
Thermodynamic Consideration ◽  
Increase With Increase ◽  
Gibb’S Free Energy ◽  
Kinetics Of

<p class="Default"><span lang="EN-US">Adsorption and corrosion inhibitive properties of ethanol extract of Dialium guineense leaves for mild steel in 0.5M HCl was studied using the gravimetric method. The results showed that the ethanol extract of <em>Dialium guineense</em> leaves is a good corrosion inhibitor for mild steel in 0.5 M HCl. The inhibition efficiency was found to increase with increase in the concentration of ethanol extract of <em>Dialium guineense</em> leaves up to the maximum of 92 %, but at the same time it decreased as the temperature was increased. Corrosion inhibition by the extract of <em>Dialium guineense</em> leaves is carried out by adsorption mechanism with the kinetics of corrosion following the pseudo first order reaction with high correlation. Thermodynamic consideration revealed that adsorption of the ethanol extract of <em>Dialium guineense</em> leaves on mild steel surface is an exothermic and spontaneous process that fitted the Langmuir adsorption isotherm. The values of activation energy and Gibb’s free energy were found within the range of limits expected for the mechanism of physical adsorption.</span></p>

scholarly journals COMPARATIVE ANALYSIS OF ADSORPTION AND CORROSION INHIBITIVE PROPERTIES OF ETHANOL EXTRACT OF DIALIUM GUINEENSE LEAVES FOR MILD STEEL IN 0.5M HCL

2020 ◽  
Vol 1 (1) ◽  
pp. 16-25
Author(s):  
E. S. Adeniji ◽  
A. A. Bamigbola
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Gravimetric Method ◽  
Ethanol Extract ◽  
Pseudo First Order Reaction ◽  
Thermodynamic Consideration ◽  
Langmuir Adsorption ◽  
Increase With Increase ◽  
Gibb’S Free Energy

In this study, the adsorption and corrosion inhibitive properties of ethanol extract of Dialium guineense leaves for mild steel in 0.5M HCl was studied using gravimetric method. The results obtained showed that the ethanol extract of Dialium guineense leave is a good adsorption inhibitor of Mild Steel in 0.5M HCl. The inhibition efficiency was found to increase with increase in the concentration of ethanol extract of Dialium guineense leave but decreased as the temperature increases. The inhibition efficiency increases up to a maximum of 92%. The kinetic study was found to follow pseudo first order reaction with high correlation. Thermodynamic consideration reveals that adsorption of ethanol extract of Dialium guineense leaves on mild steel surface is exothermic, spontaneous and fitted the Langmuir adsorption isotherm. The value of activation energy and Gibb’s free energy obtained were within the range of limits expected for the mechanism of physical adsorption. Adeniji, E. S. | Department of Chemistry, Ahmadu Bello University (ABU) Zaria, Kaduna State, Nigeria

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

CORROSION INHIBITION EFFICIENCY, ADSORPTION BEHAVIOR, KINETICS AND THERMODYNAMIC STUDIES OF LANNEA ACIDA ETHANOL LEAVES EXTRACT ON MILD STEEL IN HYDROCHLORIC ACID

2021 ◽  
Vol 5 (2) ◽  
pp. 621-634
Author(s):  
Abdulfatai A. Siaka ◽  
Sunday O. Owa ◽  
M. K. Gafar ◽  
J. O. Okunola
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Rate Determining Step ◽  
First Order Kinetics ◽  
Freundlich Adsorption Isotherm ◽  
Entropy Of Activation ◽  
Ft Ir

The corrosion inhibition potential of lannea acida (LA) ethanol leaves extract was investigated using mild steel in 1.0 M HCl solution. The leaves extract was characterized using FT- IR Spectroscopy. The surface analysis of the mild steel was also studied using scanning electron microscopy. The study was carried out at an ambient temperature and selected high temperatures. The LA leaves extract concentration ranges from 0.1- 0.9g/L. The data obtained from weight loss measurements show that the leaves extract repressed the corrosion rate of mild steel. The increase in temperature with a corresponding increase or decrease in the inhibitor efficiency of LA leaves extract shows that the adsorption mechanism obeyed comprehensive adsorption. The value of activation energies (Ea) obtained which ranged from 15.32 to 17.63 kJ mol-1 agrees with the physical adsorption mechanism. The values of enthalpy of activation (ΔH*) obtained were positive and ranged from 38.29 to 59.00 KJ mol-1 is an indication that the dissolution of the mild steel is an endothermic reaction and requires less energy in the presence of LA leaves extract. The values of entropy of activation (ΔS*) obtained which were negative indicate that the activated complex in the rate-determining step is associative rather than dissociative. The kinetics study shows the adsorption process follows first-order kinetics. The adsorption isotherm data fitted best into Freundlich adsorption isotherm

scholarly journals Naturally Occurring Exudates Gums as Ecofriendly Inhibitors for Mild Steel Corrosion in Acidic Medium

2021 ◽  
Vol 5 (2) ◽  
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Physical Adsorption ◽  
Steel Corrosion ◽  
Adsorption Parameters ◽  
Kinetic And Thermodynamic Parameters ◽  
Mild Steel Corrosion ◽  
Increase With Increase ◽  
Steel Increase ◽  
Significant Difference

The corrosion inhibition potentials of gum exudates from Daniella oliveri (DO) and Commiphora Africana (CA) for the corrosion of mild steel in H2 SO4 have been studied using weight loss and thermometric methods at 303 and 333K. Results show that the exudates gum actually reduced the rates of corrosion of mild steel. Increase in the concentrations of the exudate’s gums increased their percentage inhibition efficiencies. Corrosion rate was found to increase with increase in temperature in the presence and absence of the gum exudates, though the corrosion rate was slower in the presence of the exudates gums. Both DO and CA exudates gums were found to obey Temkin and Langmuir adsorption models at all concentrations and temperatures studied. Physical adsorption mechanism was proposed from the adsorption parameters. Kinetic and thermodynamic parameters revealed that the adsorption process is spontaneous, exothermic and no significant difference was found between the inhibition efficiencies of DO and CA.

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 Study of Temperature Effect on the Corrosion Inhibition of C38 Carbon Steel Using Amino-tris(Methylenephosphonic) Acid in Hydrochloric Acid Solution

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Najoua Labjar ◽  
Fouad Bentiss ◽  
Mounim Lebrini ◽  
Charafeddine Jama ◽  
Souad El hajjaji
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Inhibition Mechanism ◽  
Langmuir Adsorption ◽  
Kinetic And Thermodynamic Parameters ◽  
Tafel Polarization ◽  
Increase With Increase ◽  
Corrosion Inhibition Efficiency

Tafel polarization method was used to assess the corrosion inhibitive and adsorption behaviours of amino-tris(methylenephosphonic) acid (ATMP) for C38 carbon steel in 1 M HCl solution in the temperature range from 30 to . It was shown that the corrosion inhibition efficiency was found to increase with increase in ATMP concentration but decreased with temperature, which is suggestive of physical adsorption mechanism. The adsorption of the ATMP onto the C38 steel surface was found to follow Langmuir adsorption isotherm model. The corrosion inhibition mechanism was further corroborated by the values of kinetic and thermodynamic parameters obtained from the experimental data.

scholarly journals Thermodynamic and Kinetic Parameters of Methanolic Extract of Leaves of Cochlospermum Tinctorium as Eco-friendly Inhibitor for Corrosion of Mild Steel in HCL Medium

2015 ◽  
Vol 6 ◽  
pp. 83-90
Author(s):  
G I Adams ◽  
S O Adejo ◽  
J U Ahile ◽  
J A Gbertyo ◽  
J O Ogbodo
Keyword(s):  
Mild Steel ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Methanolic Extract ◽  
Physical Adsorption ◽  
Average Value ◽  
Extract Concentration ◽  
Weight Loss Method ◽  
Loss Method ◽  
Hcl Medium

Thermodynamic, kinetic and adsorptive parameters of methanolic extract of leaves of Cochlospermum tinctorium as eco-friendly inhibitor for the corrosion of mild steel in HCl medium were evaluated through the weight loss method at 303 K and 311 K. The inhibition efficiency, %IE, increased with increase in extract concentration, but found to be better at 303 K than 311 K. The decrease in %IE with increase in temperature with the average value of 81.88 kJ/mol for activation energy, E a , and the values of free energy, ÄG, for the adsorption process are all supportive of physical adsorption mechanism. The values of heat of adsorption, Q ads,, are all negative, an indication that the adsorption process was exothermal. The half-life, t 1/2 , value increased with increase in inhibitor concentration and low at high higher, implying the inhibitor performance increased with increase in the extract concentration and decreased with rise in temperature. The data best fitted the Langmuir adsorption isotherm.

scholarly journals Inhibition of Corrosion of Aluminum Alloy AA8011 in Alkaline Medium Using Palisota hirsute Extract

2016 ◽  
Vol 67 ◽  
pp. 14-20 ◽  
Author(s):  
Lebe A. Nnanna ◽  
Kings O. Uchendu ◽  
Glory Ikwuagwu ◽  
Wisdom O. John ◽  
Uche Ihekoronye
Keyword(s):  
Experimental Data ◽  
Free Energy ◽  
Alkaline Medium ◽  
Steel Surface ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Aluminum Surface ◽  
Free Energy Of Adsorption ◽  
Gibb’S Free Energy

Gravimetric technique was used to study the inhibition of aluminium alloy AA8011 in an alkaline medium using an eco-friendly inhibitor, Palisota hirsute. The study revealed that the extract reduced the corrosion rate of aluminium AA8011 from 0.407 mm/yr to as low as 0.106 mm/yr in 0.25 M KOH after being exposed for five hours. The inhibition efficiency was found to increase as the concentration of the plant extract in the medium increased. The adsorption studies, computed from the experimental data revealed Langmuir isotherm as the best model for the isotherm (r2=0.999) on the mild steel surface. Gibb’s free energy of adsorption was also calculated and gotten to be 15.61 kJmol-1, suggesting that inhibitor molecules have been spontaneously adsorbed onto the aluminum surface through physical adsorption mechanism.

Adsorption and corrosion inhibition characteristics of two medicinal molecules

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Half Life ◽  
Thermodynamic Data ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Corrosive Environment ◽  
Corrosion Inhibition Efficiency

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

scholarly journals Characteristics and Kinetics of Rosin Pentaerythritol Ester via Oxidation Process under Ultraviolet Irradiation

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2816 ◽  
Author(s):  
Yuanlin Li ◽  
Xiongmin Liu ◽  
Qiang Zhang ◽  
Bo Wang ◽  
Chang Yu ◽  
...  
Keyword(s):  
Light Intensity ◽  
Oxidation Kinetics ◽  
Pseudo First Order Reaction ◽  
Initial Oxidation ◽  
Photo Oxidation ◽  
Average Value ◽  
Pentaerythritol Ester ◽  
Fundamental Information ◽  
The Stability ◽  
Kinetics Of

A self-designed reaction device was used as a promising equipment to investigate the oxidation characteristics and kinetics of rosin pentaerythritol ester (RPE) under UV irradiation. Photo-oxidation kinetics and the initial quantum yield (Φ) of RPE were calculated. The initial oxidation product of the photo-oxidation reaction—peroxide was analyzed by iodimetry. The peroxide concentration is related to the light intensity (I) and the temperature (T), and the increasing T and I would destabilize the RPE by accelerating peroxide forming. Photo-oxidation of RPE follows the pseudo first-order reaction kinetics. The relationship between activation energy and logarithm of light intensity (ln I) is linear, and it is expressed as Ea = −4.937ln I + 45.565. Φ was calculated by the photo-oxidation kinetics, and the average value of Φ was 7.19% in the light intensity range of 200–800 μW cm−2. This research can provide fundamental information for application of RPE, and help obtain a better understanding of the stability of rosin esters.

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