Evaluation of Performance of Corrosion Inhibitors Using Adsorption Isotherm Models: An Overview

Ituen, Ekemini; Akaranta, Onyewuchi; James, A. O.

doi:10.9734/csji/2017/28976

Cited by 148 publications

(76 citation statements)

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“…The obtained value of 9 decreases with increase in temperature which implies that the binding strength weakens with increase in temperaturepossibility of desorption of inhibitor molecules. This trend coupled with values of ∆< 6=> less negative than -40 kJmol -1 obtained has been associated with spontaneous physical adsorption mechanism [22].…”

Section: Adsorption Considerationssupporting

confidence: 56%

“…The calculated values of µ (Table 3) for the inhibition of mild steel corrosion by different concentration of copper soap in the sulphuric acid solution afforded negative values of µ which indicate decrease in inhibition efficiency with increase in temperature. According to this model, this observation is associated with physical adsorption mechanism [22].…”

Section: Temperature Coefficient Of Inhibition Efficiencymentioning

confidence: 99%

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Inhibition of Steel Corrosion in Simulated Oilfield Acidizing Medium Using Metallic Soap from Local Biomaterial

Ituen¹,

Asuquo²,

Essien³

2017

OGCE

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Metallic soap prepared by saponification of melon seed oil (Cucumeropsis mannii N) with copper (II) salt was investigated as corrosion inhibitor for mild steel corrosion in 1 M hydrochloric acid solution. Results reveal that the metallic soap inhibited the corrosion process by spontaneous physical adsorption of the phytochemicals of the seed oil onto the mild steel surface. The highest inhibition efficiency of 82.7% was obtained at 30°C with 10 g/L of the metallic soap, but this efficiency decreased with increase in temperature. The fractional surface coverage data best fitted into Temkin adsorption model which was used to predict the inhibitor-metal binding strength as a function of temperature. Atomic Absorption Spectrophotometric assessment of copper (II) ion composition in the inhibitor afforded a value within the safe limit for health, environment and personnel. Density functional theorem (DFT) studies provided supportive evidence of possible involvement of the fatty acid phyto-components in the adsorption process. The mechanism of inhibition was also predicted by applying the recent temperature coefficient of inhibition efficiency equation.

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Section: Adsorption Considerationssupporting

confidence: 56%

Section: Temperature Coefficient Of Inhibition Efficiencymentioning

confidence: 99%

Inhibition of Steel Corrosion in Simulated Oilfield Acidizing Medium Using Metallic Soap from Local Biomaterial

Ituen¹,

Asuquo²,

Essien³

2017

OGCE

Self Cite

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“…On the other hand, metallic surface become negatively charged because of the adsorption of counterions of electrolytes on the positively charged metallic surface. The two appositively charged species interact from each other by electrostatic force of attraction; therefore during initial stage adsorption, behavior of inhibitors on metallic surface obeys the physisorption mechanism . However, during the course of metal‐inhibitor interactions, the non‐bonding electrons of heteroatoms and π‐electrons of multiple bonds get transferred (charge donation) into the d‐orbital of the surface metallic atoms (eg, Fe) that results in the formation of coordinate bonding between them.…”

Section: Metal‐inhibitor Interactions: Coordination Chemistrymentioning

confidence: 99%

Sulfur and phosphorus heteroatom‐containing compounds as corrosion inhibitors: An overview

Verma

Verma²,

Ebenso

et al. 2018

Heteroatom Chemistry

127

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Use of organic compounds containing nitrogen (N), oxygen (O), sulfur (S), and phosphorus (P) heteroatoms in their molecular structures is one of the most effective, economic, and practical corrosion inhibitors. The effectiveness of the heteroatoms toward metallic corrosion inhibition follows the order: P > S > N > O. The metal‐inhibitor interactions involve the charge sharing between the heteroatoms and empty d‐orbitals of the surface metallic atoms; therefore, a heteroatom with lower electronegativity value is more potent to form strong bonding (charge sharing) with metallic surface as compared to more electronegative heteroatom. Literature study reveals that almost all corrosion inhibitors have either one or more heteroatoms in their molecular structures particularly in the form of polar functional groups, which enhance their adsorption tendency on metallic surface. Present review paper features the collection of some major works that have been published on metallic corrosion inhibition containing these P, S, O, and N heteroatoms. Since now, several review articles have been published describing the application of N and O atoms; however, the reviews on use of P and S heteroatoms are scare. Therefore, aim of the present article was to mainly describe the collection of corrosion inhibitors containing S and P heteroatoms.

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“…The values of free energy of adsorption obtained for Langmuir and Freundlich are close to each other (to the nearest whole number − 20 kJ/g), specifying good agreement with each other. The ease of adsorption on the surface of the coupons was elucidated using Freundlich isotherm, since the reciprocals of n are less than 1 [47]. However, the high values of K ads attributed to Temkin (i.e.…”

Section: Effect Of Inhibitor Concentration and Adsorption Isothermmentioning

confidence: 99%

Newbouldia laevis Leaves Extract as Tenable Eco-Friendly Corrosion Inhibitor for Aluminium Alloy AA7075-T7351 in 1 M HCl Corrosive Environment: Gravimetric, Electrochemical and Thermodynamic Studies

2020

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The corrosion inhibition evaluation of aluminium alloy AA7075-T7351 in 1.0 M HCl environment, by biologically active and water soluble luteolin 7-glucoside and phenolic polymeric compounds in Newbouldia laevis (NBL) extracts-as organic corrosion inhibitors of aluminium-have been investigated using gravimetric, electrochemical and thermodynamic techniques respectively, at room temperature (25 ± 1 °C), and at elevated temperatures of 40, 50, 60 and 65 °C. Gravimetric results showed that optimal inhibition efficiency ( ), at room temperature (298 ± 1 K) and 338 K are 86.1% and 67.5% respectively for the maximum concentration of 0.6 g/L. This suggests that NBL extract was affected by temperature and accomplished the inhibiting episode through an electrostatic pull of the polymeric components of the NBL extract onto AA7075-T7351 coupons or physical adsorption, that obeyed Langmuir, Freundlich and Temkin adsorption isotherms, in increasing order; Temkin, Freundlich and Langmuir. Adsorption coefficient, K ads , and Gibb's free energy of adsorption, ΔG 0 ads , values obtained from Temkin isotherms were high and proved that adsorption of NBL on AA7075-T7351 surfaces were strong and spontaneous. Potentiodynamic polarization and electrochemical impedance spectroscopy results showed that NBL is a mixed-type corrosion inhibitor of AA7075-T7351 in 1 M HCl environment, which was achieved through the blockage/obstruction/reduction of charge flow by the polymeric barrier on the aluminium alloy's surface. Increases in the linear part of the Bode plot slopes with increase in NBL concentrations further indicated the existence of a protective layer on the AA7075-T7351 surface.

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Evaluation of Performance of Corrosion Inhibitors Using Adsorption Isotherm Models: An Overview

Cited by 148 publications

References 0 publications

Inhibition of Steel Corrosion in Simulated Oilfield Acidizing Medium Using Metallic Soap from Local Biomaterial

Inhibition of Steel Corrosion in Simulated Oilfield Acidizing Medium Using Metallic Soap from Local Biomaterial

Sulfur and phosphorus heteroatom‐containing compounds as corrosion inhibitors: An overview

Newbouldia laevis Leaves Extract as Tenable Eco-Friendly Corrosion Inhibitor for Aluminium Alloy AA7075-T7351 in 1 M HCl Corrosive Environment: Gravimetric, Electrochemical and Thermodynamic Studies

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