scholarly journals "UTILIZATION OF Ammi majus L. FRUITS EXTRACTS AS INHIBITORS FOR MILD STEEL CORROSION IN ACID MEDIA"

2006 ◽  
Vol 3 (2) ◽  
pp. 99-110 ◽  
Author(s):  
S. T. Arab ◽  
A. M. Al-Turkustani ◽  
S. Y. Al-Nami
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Acid Corrosion ◽  
Steel Corrosion ◽  
Alcoholic Extract ◽  
Free Energies ◽  
Acid Media ◽  
Mild Steel Corrosion ◽  
Ammi Majus ◽  
Coumarin Compounds

The inhibition effect of Ammi majus L. fruit extracts, alcoholic extract (A), aqueous extract (B) and defatting extract (C), on the corrosion of mild steel in 2.0M H2SO4 containing 10% EtOH at 30?C was investigated using chemical, electrochemical and scanning microscopy measurements. It was found that as the concentration of extracts increases, the rate of mild steel corrosion is decreased, which indicates that an inhibition of the corrosion process take place. The decrease of the inhibition efficiency of the extracts was given as: B > C > A, the electrochemical results showed that the extracts A, B and C, act as mixed inhibitors and the corrosion inhibition of mild steel occurred mainly by charge transfer mechanism. The scanning electron microscopy results showed that the changes (pits) on the mild steel surface is due to the effect of acid corrosion became less, the steel surface appears to be unchanged , by the extracts addition. The experimental results fit Langmuir isotherm. Values of equilibrium constant of adsorption Kads. and the standard free energies of adsorption DG?ads. for the extracts, were calculated. The effect of two coumarin compounds was studied by chemical methods in 2.0M H2SO4 containing 10% EtOH separately and in mixture of them. The results showed that: ? As the concentration of studied compounds (Xabthotoxin(I), Imperatorin (II) increased, the rate of mild steel corrosion was decreased. ? The inhibition efficency obtained from the mixture was very high and nearly the same as when the extract was used which supported that the inhibition of A. majus extract is due to the presence of coumarin compounds.

scholarly journals Inhibition of the Corrosion of Mild Steel in Acid Media by Naturally Occurring Acacia Senegal

2010 ◽  
Vol 7 (4) ◽  
pp. 1220-1229 ◽  
Author(s):  
Urvija Garg ◽  
R. K. Tak
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Mild Steel ◽  
Steel Corrosion ◽  
Alcoholic Extract ◽  
Acacia Senegal ◽  
Acid Media ◽  
Naturally Occurring ◽  
Mild Steel Corrosion ◽  
Hcl Solution

The inhibition of corrosion of mild steel in HCl solution by naturally occurringAcacia Senegalhas been studied in relation to the concentration of inhibitor and concentration of corrosive medium. It has been observed that theAcacia Senegalalcoholic extract acts as a good corrosion inhibitor in hydrochloric acid solution and the adsorption of the extract provides a good protection against mild steel corrosion.

scholarly journals Influence of Cissus populnea stem extract on kinetics and thermodynamics of mild steel corrosion in acidic medium

2019 ◽  
Vol 30 (1) ◽  
pp. 14-20
Author(s):  
Habibat F. Chahul ◽  
David T. Orhemba ◽  
Taiwo A. Gbadamosi
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Steel Corrosion ◽  
Order Type ◽  
Isotherm Models ◽  
Acid Media ◽  
Mild Steel Corrosion ◽  
Stem Extract ◽  
Physical Interactions ◽  
Kinetics Of

Abstract The inhibition of mild steel corrosion in 1.0 M HCl and 0.5 M H2SO4 by Cissus populnea stem extract was investigated using weight loss measurements in the temperature range of 303 – 333 K. Results from the study revealed that Cissus populnea stem extract inhibited the corrosion of mild steel in both acid media. Inhibition efficiency of the stem extract increased with increase in the extract concentration but decreased with immersion time. The kinetics of the reaction aligned with a first order type. Thermodynamics investigations showed that Cissus populnea extract is adsorbed on the steel surface through physical interactions, and the adsorption process was endothermic and spontaneous. Langmuir, Freundlich and Temkin isotherm models best described the adsorption mechanism of the stem extract on the steel surface.

scholarly journals Inhibition of Acid Corrosion of Mild Steel Using Delonix regia Leaves Extract

2016 ◽  
Vol 69 ◽  
pp. 74-86 ◽  
Author(s):  
Maduabuchi Arinzechukwu Chidiebere ◽  
Lebe Nnanna ◽  
Chinonso Blessing Adindu ◽  
Kanayo Oguzie ◽  
Okolue Beluonwu ◽  
...  
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Acid Corrosion ◽  
Protective Layer ◽  
Steel Corrosion ◽  
Surface Probe ◽  
Solution Interface ◽  
Mild Steel Corrosion ◽  
Acidic Environments ◽  
Surface Increase

The inhibition efficacy of aqueous extracts of the leaves ofDelonixregia(DR) in 1 M HCl and 0.5 M H2SO4have been investigated using weight loss, electrochemical and surface probe techniques. DR extract inhibited mild steel corrosion in both acidic environments via adsorption of the extract organic matter on the metal/solution interface. Potentiodynamic polarization results indicate that DR is a mixed type inhibitor in both acidic environments, whereas the impedance results revealed adsorption of the DR species on a corroding steel surface. Increase in inhibition efficiency was concentration dependent. The adsorption followed Langmuir adsorption isotherm. Scanning electron microscopy (SEM) results revealed the formation of a protective layer adsorbed on a mild steel surface in the acid solutions.

Inhibitive and Adsorption behaviour of date Palm Hemicellulose on Mild Steel Corrosion in Sulfuric Acid Media

2019 ◽  
Vol 12 (6) ◽  
pp. 303
Author(s):  
Messaoud Gouamid ◽  
Louiza Zenkhri ◽  
Soufiane Benhamida ◽  
Elyacout Chebouat ◽  
Khaled Charradi
Keyword(s):  
Sulfuric Acid ◽  
Mild Steel ◽  
Date Palm ◽  
Steel Corrosion ◽  
Adsorption Behaviour ◽  
Acid Media ◽  
Mild Steel Corrosion

scholarly journals Inhibition of Mild Steel Corrosion by 4-benzyl-1-(4-oxo-4-phenylbutanoyl)thiosemicarbazide: Gravimetrical, Adsorption and Theoretical Studies

Lubricants ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 93
Author(s):  
Ahmed A. Alamiery ◽  
Wan Nor Roslam Wan Isahak ◽  
Mohd S. Takriff
Keyword(s):  
Dft Calculations ◽  
Mild Steel ◽  
Active Sites ◽  
Steel Surface ◽  
Protective Efficacy ◽  
Steel Corrosion ◽  
Inhibitory Effect ◽  
Inhibitor Concentration ◽  
Mild Steel Surface ◽  
Mild Steel Corrosion

Gravimetric measurements were applied to study the inhibitory effect of 4-benzyl-1-(4-oxo-4-phenylbutanoyl)thiosemicarbazide (BOT) on the corrosion of mild steel in 1.0 M HCl. BOT has a good inhibitory efficacy of 92.5 percent at 500 ppm, according to weight loss results. The effect of inhibitor concentration on the mild corrosion behavior of steel was investigated and it was discovered that the higher the inhibitor concentration, the higher the damping efficiency. The results confirm that BOT is an effective corrosion inhibitor for mild steel in the presence of 1.0 M HCl. Furthermore, the higher protection efficiency with increasing temperature and the free energy value showed that BOT molecules participate in both chemisorption (coordination bonds between the active sites of BOT molecules and d-orbital of iron atoms) and physisorption (through the physical interactions on the mild steel surface). The adsorption mechanism on the mild steel surface obeys the Langmuir adsorption isotherm model. Quantum chemical calculations based on the DFT calculations were conducted on BOT. DFT calculations indicated that the protective efficacy of the tested inhibitor increased with the increase in energy of HOMO. The theoretical findings revealed that the broadly stretched linked functional groups (carbonyl and thionyl) and heteroatoms (sulfur, nitrogen and oxygen) in the structure of tested inhibitor molecules are responsible for the significant inhibitive performance, due to possible bonding with Fe atoms on the mild steel surface by donating electrons to the d-orbitals of Fe atoms. Both experimental and theoretical findings in the current investigation are in excellent harmony.

scholarly journals Electrochemical surface modification technique to impede mild steel corrosion using Perfluorooctanoic Acid.

2016 ◽  
Vol 5 (4) ◽  
pp. 247
Author(s):  
Shubha H Natarj ◽  
Venkatesha T Venkatarangaiah ◽  
Anantha N Subbarao
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Steel Corrosion ◽  
Perfluorooctanoic Acid ◽  
Surface Hydrophobicity ◽  
Dip Coating ◽  
Self Assembled Monolayer ◽  
Mild Steel Surface ◽  
Mild Steel Corrosion ◽  
Modification Technique

<div><p><em>The present work demonstrated that corrosion inhibition efficiency of electrochemically generated organic coat is remarkably effective than self-assembled monolayer (SAM) generated by dip coating technique. Perfluorooctanoic Acid (PFOA) is used to modify mild steel surface for effective protection. Infrared reflection absorption spectroscopy and contact angle measurements substantiate the modification of mild steel surface and its effect on surface hydrophobicity. A comparison between electrochemical properties of PFOA SAM generated by dip coat method (DC-PFOA) and PFOA coat generated by electrochemical method (EC-PFOA) is presented. Electrochemical measurements reveal that the corrosion protection efficiency of EC-PFOA (91%) is much superior to DC-PFOA (28%). </em></p></div>

Inhibition of Mild Steel Corrosion in Hydrochloric and Sulfuric Acid Media Using a Thiosemicarbazone Derivative

2013 ◽  
Vol 52 (36) ◽  
pp. 12733-12747 ◽  
Author(s):  
Punita Mourya ◽  
Sitashree Banerjee ◽  
Rashmi Bala Rastogi ◽  
Madan Mohan Singh
Keyword(s):  
Sulfuric Acid ◽  
Mild Steel ◽  
Steel Corrosion ◽  
Acid Media ◽  
Mild Steel Corrosion
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