Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4

Obi-Egbedi, N.O.; Obot, I.B.

doi:10.1016/j.corsci.2010.09.020

Cited by 229 publications

(79 citation statements)

References 83 publications

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“…The effect is attributed to the amassing of inhibitor molecules onto the positively charged metal surface leading a decrease in direct contact with metal and corrosive environment. Similar results were found in other studies about different inhibitors for aluminum alloy in hydrochloric acid [21]. Temperature has great influence on the corrosion rate of metals.…”

Section: Effect Of Concentrationsupporting

confidence: 80%

“…The decrease in inhibition efficiency and increase in corrosion rate was observed with increase in temperature from 30 to 50 °C in the presence of 1 mM inhibitor, which may be attributed to the fact that the adsorption processes were spontaneous and irreversible with heat evolution, and the increase in temperature was not beneficial to the adsorption. The influence may also come from the weakening of electrostatic adsorption on the metal surface and the aggravation of desorption of the inhibitor molecule from the metal surface when the temperature increases [20][21][22]. In addition, the metallic corrosion in acidic environments is usually accompanied by the release of H2, and the adsorption process of the inhibitor could be affected by the agitation caused by the acceleration of H2 evolution rates at higher temperature and lead to the decrease of corresponding inhibition efficiency [23].…”

Section: Effect Of Concentrationmentioning

confidence: 99%

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The Corrosion Inhibition Effect of Triazinedithiol Inhibitors for Aluminum Alloy in a 1 M HCl Solution

Zhao

Tang

Dang

et al. 2017

Metals

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Abstract:Two environmental friendly triazinedithiol inhibitors 6-diallylamino-1,3,5-triazine-2,4-dithiol monosodium (DAN) and 6-dibutylamino-1,3,5-triazine-2,4-dithiol monosodium (DBN) were synthesized and their corrosion inhibition for aluminum alloy in a 1 M HCl solution was studied using weight loss methods, electrochemical measurements, and scanning electron microscopy (SEM) techniques. The inhibition efficiency of both DAN and DBN improved with increases in inhibitor concentration but decreased with increases in temperature. Results from potentiodynamic polarization and EIS showed that the corrosion inhibition efficiency of DAN and DBN was excellent. The adsorption of inhibitors on the aluminum alloy surface followed Langmuir adsorption isotherms. Morphology observation revealed that the aluminum alloy was greatly protected by these triazinedithiol inhibitors. Further, density functional theory (DFT) was used to investigate the relationships between molecular structural and inhibition efficiency.

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Section: Effect Of Concentrationsupporting

confidence: 80%

Section: Effect Of Concentrationmentioning

confidence: 99%

The Corrosion Inhibition Effect of Triazinedithiol Inhibitors for Aluminum Alloy in a 1 M HCl Solution

Zhao

Tang

Dang

et al. 2017

Metals

View full text Add to dashboard Cite

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“…This implies that the corrosion rate is higher in the absence of inhibitor than with inhibited mild iron samples. Similar results were reported on the kinetics of some organic compounds [52,53]. Another indication of the rate of a firstorder reaction is the time constant, s, [53].…”

Section: Correlation Coefficients Rsupporting

confidence: 69%

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Madkour

Elroby²

2015

Int J Ind Chem

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Quantum chemical calculations based on the density functional theory (DFT) method were performed on five polydentate Schiff base compounds (PSCs), act as corrosion inhibitors for iron in aerated 2.0 M HNO 3 and 2.0 M NaOH, aiming to analyze the characteristics of the inhibitor/surface mechanism as well as to analyze the experimental data and to describe the structural nature of the inhibitor on the corrosion process. The relationship between molecular structure of PSC and their inhibition efficiencies was discussed. The inhibition effect has been investigated using weight loss, thermometric, potentiodynamic polarization measurements and quantum chemical study. Among the compounds studied, 4-(2-hydroxynaphthylideneamino) antipyrine (PSC_1) exhibited the best inhibition efficiency IE (%) 78.4 % at 10 -4 M at 303 K. The high IE of (PSCs) was attributed to the blocking of active sites by adsorption of inhibitor molecules on the iron surface. Adsorption of (PSCs) inhibitors is spontaneous, exothermic, obeyed Temkin isotherm and is regarded as physiochemical mechanism. Polarization measurements indicate that all the examined Schiff bases are of mixedtype inhibitor in HNO 3 ; causing only inhibition of the cathode process in NaOH. The results showed that the inhibition efficiency of PSCs increased with the increase in E HOMO and decrease in E LUMO -E HOMO ; and the areas containing N and O atoms are most possible sites for bonding the metal iron surface by donating electrons to the metal.

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“…The positive values of Δ * in the presence of inhibitor imply that the rate determining step for the activated complex is dissociation step rather than an association, meaning that the adsorption process is accompanied by an increase in entropy, which is the driving force for the adsorption of inhibitor molecules on the mild steel surface [33].…”

Section: Effect Of Temperaturementioning

confidence: 99%

Inhibiting Effects of Rabeprazole Sulfide on the Corrosion of Mild Steel in Acidic Chloride Solution

Pavithra

Venkatesha

Kumar

2013

International Journal of Electrochemistry

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The corrosion inhibition effect of Rabeprazole sulfide (RS) on mild steel in 1 M hydrochloric acid (HCl) was investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and chronoamperometric measurements. Protection efficiency of RS increases with the concentration and decreases with the rise in temperature. Adsorption of RS on mild steel surface in 1 M HCl follows Langmuir adsorption isotherm. The kinetic and thermodynamic parameters governing the adsorption process were calculated and discussed. The polarization results suggest that RS performed as an excellent mixed-type inhibitor for mild steel corrosion in 1 M HCl.

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Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4

Cited by 229 publications

References 83 publications

The Corrosion Inhibition Effect of Triazinedithiol Inhibitors for Aluminum Alloy in a 1 M HCl Solution

The Corrosion Inhibition Effect of Triazinedithiol Inhibitors for Aluminum Alloy in a 1 M HCl Solution

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Inhibiting Effects of Rabeprazole Sulfide on the Corrosion of Mild Steel in Acidic Chloride Solution

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