Corrosion Inhibition on Mild Steel Using PFOA Additives

2017 ◽  
Vol 727 ◽  
pp. 59-66
Author(s):  
Wen Long Jiang ◽  
Wei Zhou ◽  
Ji Fei Ying ◽  
Kong Chao Shen ◽  
Xing Yu Gao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Steel Surface ◽  
Steel Corrosion ◽  
Scanning Microscope ◽  
Rust Layer ◽  
Mild Steel Corrosion ◽  
Surface Laser ◽  
Confocal Scanning ◽  
Simulated Seawater

In this paper, the anticorrosive properties of perfluorooctanoic acid (PFOA) on Q235 mild steel corrosion were estimated in simulated seawater. XRD and EDS results showed that PFOA could penetrate the rust layer and adsorb on the surface of steel and destroy rust layer. Our polarization measurements revealed that PFOA is a useful inhibitor, with a more pronounced anode effect, while impedance results also indicated successful adsorption of the PFOA species on the steel surface. Laser confocal scanning microscope studies give the evidence that corrosion resistance of the treated samples improved compared to the untreated samples. Molecular simulation technique was used to confirm the ability of PFOA to decrease corrosion. The 150 g/L concentration of PFOA showed the most significant improvement in the anticorrosive property.

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>

scholarly journals COVID-19 Vaccine, Contraceptive, Viscosity and Safety Margin Change

2021 ◽  
Vol 11 (2) ◽  
pp. 3509-3512
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Safety Margin ◽  
Steel Corrosion ◽  
Langmuir Adsorption Isotherm ◽  
Langmuir Adsorption ◽  
Mild Steel Corrosion ◽  
Hcl Solution

The temperature effect of 4-ethyl-1-(4-oxo-4-phenylbutanoyl)thiosemicarbazide (EOPT) on the mild steel corrosion in 1 M HCl solution was studied by gravimetric techniques at temperatures varying from 303 to 333 K. The investigated inhibitor concentrations were started from 100 ppm and ended with 500 ppm. The inhibition efficiency increased with the increase of the concentration of the inhibitor and reached 96.1% with the concentration of 500 ppm at 303 K and decreased to 66.3% at 333 K. Moreover, the inhibition efficiencies decreased with the temperature increase for both acids. Using the Langmuir adsorption isotherm for the adsorption of this inhibitor on the mild steel surface was determined. EOPT was found to be an efficient corrosion inhibitor due to its structural molecules, which contain sulfur, nitrogen, and oxygen, hetero atoms an addition to the aromatic ring.

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 Experimental and theoretical study on the corrosion inhibitor potential of quinazoline derivative for mild steel in hydrochloric acid solution

2020 ◽  
Author(s):  
Fidelis Ebunta Abeng ◽  
Valentine Anadebe ◽  
Patience Yake Nkom ◽  
Enyinda Goodluck Kamalu ◽  
Kelechi J. Uwakwe
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Metal Surfaces ◽  
Steel Surface ◽  
Physical Adsorption ◽  
Steel Corrosion ◽  
Quinazoline Derivative ◽  
Mild Steel Surface ◽  
Mild Steel Corrosion

Interaction of metal surfaces with organic molecules has a significant role in corrosion inhibition of metals and alloys. More clarification, from both experimental and computa­tional view is needed in describing the application of inhibitors for protection of metal surfaces. In this study, the surface adsorption and corrosion inhibition behavior of metol­azone, a quinazoline derivative, on mild steel in 0.02, 0.04, 0.06, and 0.08 M HCl solutions were investigated. Weight loss, potentiodynamic polarization and electrochemical impe­dance spectroscopy techniques were used. The optimum inhibition efficiencies of 75, 82 and 83 % were found by these three techniques at the optimum inhibitor concentration of 500 mg/L and 303 K. Scanning electron microscopy (SEM) was used to confirm adsorption of quinazoline derivative on the surface of the mild steel. Computational simulations were additionally used to give insights into the interaction between quinazoline inhibitor and mild steel surface. Thermodynamic parameters of mild steel corrosion showed that quinazoline derivative functions as an effective anti-corrosive agent that slows down corrosion process. Potentiodynamic polarization results revealed a mixed-type inhibitor, while the result of the adsorption study suggests that adsorption of the inhibitor on the mild steel surface obeys the physical adsorption mechanism and follows Langmuir adsorption isotherm model.  

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.

scholarly journals Inhibition of Mild Steel Corrosion in Acidic Medium by Telfairia occidentalis Rind Extract

2018 ◽  
pp. 1-10
Author(s):  
Inemesit A. Akpan ◽  
Okon U. Abakedi ◽  
Mfon A. James
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Physical Adsorption ◽  
Steel Corrosion ◽  
Sulphuric Acid Solution ◽  
Green Inhibitor ◽  
Mild Steel Surface ◽  
Langmuir Adsorption ◽  
Telfairia Occidentalis ◽  
Mild Steel Corrosion

Telfairia occidentalis rind extract has been studied as a potential green inhibitor for mild steel corrosion in 1 M H2SO4 using weight loss and hydrogen evolution methods. The results of the investigation reveal that Telfairia occidentalis rind extract is a good inhibitor of mild steel corrosion in sulphuric acid solution. The inhibition efficiency increases with increase in rind extract concentration but decreases with increase in temperature. The calculated thermodynamic parameters reveal that the corrosion inhibition process was endothermic and spontaneous. Physical adsorption has been proposed for the adsorption of Telfairia occidentalis rind extract onto mild steel surface. The adsorption of the extract on mild steel surface obeys the Langmuir adsorption isotherm. 

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 behaviour of mild steel by three new benzaldehyde thiosemicarbazone derivatives in 0.5 M H 2 SO 4 : experimental and computational study

2019 ◽  
Vol 6 (8) ◽  
pp. 190192
Author(s):  
H. H. Zhang ◽  
C. K. Qin ◽  
Y. Chen ◽  
Z. Zhang
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Computational Study ◽  
Theoretical Calculations ◽  
Steel Corrosion ◽  
Langmuir Adsorption ◽  
Mild Steel Corrosion ◽  
Benzaldehyde Thiosemicarbazone ◽  
Good Agreement

Three new benzaldehyde thiosemicarbazone derivatives namely benzaldehyde thiosemicarbazone (BST), 4-carboxyl benzaldehyde thiosemicarbazone (PBST) and 2-carboxyl benzaldehyde thiosemicarbazone (OCT) were synthesized and their inhibition effects on mild steel corrosion in 0.5 M H 2 SO 4 solution were studied systematically using gravimetric and electrochemical measurements. Weight loss results revealed that PBST exhibited the highest inhibition efficiency of 96.6% among the investigated compounds when the concentration was 300 µM. The analysis of polarization curves indicated that the three benzaldehyde thiosemicarbazone derivatives acted as mixed type inhibitors and PBST and OCT predominantly anodic. The adsorption process of all these benzaldehyde thiosemicarbazone derivatives on Q235 steel surface in 0.5 M H 2 SO 4 solution conformed to Langmuir adsorption isotherm. Scanning electron microscopy was conducted to show the presence of benzaldehyde thiosemicarbazone derivatives on Q235 mild steel surface. The results of theoretical calculations were in good agreement with that of experimental measurements.

Sign in / Sign up

Export Citation Format

Share Document