Effect of Schiff Bases Containing Pyridyl Group as Corrosion Inhibitors for Low Carbon Steel in 0.1 M HCl

Yurt, A.; Bereket, Gözen; Kıvrak, Arif; Balaban, A.; Erk, Birgül

doi:10.1007/s10800-005-7336-3

Cited by 129 publications

(55 citation statements)

References 19 publications

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“…The adsorption process of the inhibitors are influenced by the chemical structure of the organic compounds, the nature and surface charge of the metal, the distribution of charge in the molecule, and the type of aggressive media. To look at the effect of temperature on the corrosion reaction of mild steel in the presence of the sulfonamides as inhibitor, Arrhenius equation was used [119]. The values of E a for the inhibited corrosion reaction of mild steel have been calculated and recorded in Table XII from the Arrhenius plots (not shown in this article).…”

Section: Adsorption Considerationsmentioning

confidence: 99%

Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium

Ebenso

Arslan

Kandemi̇rlı

et al. 2010

Int J of Quantum Chemistry

149

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Density functional theory (DFT) at the B3LYP/6-31G (d,p) and BP86/ CEP-31G* basis set levels and ab initio calculations using the RHF/6-31G (d,p) methods were performed on four sulfonamides (namely sulfaacetamide (SAM), sulfapyridine (SPY), sulfamerazine (SMR), and sulfathiazole (STI)) used as corrosion inhibitors for mild steel in acidic medium to determine the relationship between molecular structure and their inhibition efficiencies (%IE). The order of inhibition efficiency obtained was SMR > SPY > STI > SAM which corresponded with the order of most of the calculated quantum chemical parameters namely E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), the energy gap (DE), the Mulliken charges on the C, O, N, S atoms, hardness (g), softness (S), polarizability (a), dipole moment (l), total energy change (DE T ), electrophilicity (x), electron affinity (A), ionization potential (I), the absolute electronegativity (v), and the fraction of electrons transferred (DN). Quantitative structure activity relationship (QSAR) approach has been used and a correlation of the composite index of some of the quantum chemical parameters was performed to characterize the inhibition performance of the sulfonamides studied. The results showed that the %IE of the sulfonamides was closely related to some of the quantum chemical parameters but with varying degrees/order. The calculated %IE of the sulfonamides studied was found to be close to their experimental corrosion inhibition efficiencies. The experimental data obtained fits the Langmuir adsorption isotherm. The negative sign of the E HOMO values and other thermodynamic parameters obtained indicates that the data obtained supports physical adsorption mechanism.

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Section: Adsorption Considerationsmentioning

confidence: 99%

Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium

Ebenso

Arslan

Kandemi̇rlı

et al. 2010

Int J of Quantum Chemistry

149

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“…In order to study the effect of temperature on the corrosion reaction of mild steel in the presence of methocarbamol as inhibitor, Arrhenius equation was used (equation 5) [37]:…”

Section: Thermodynamic and Adsorption Considerationsmentioning

confidence: 99%

Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

Ebenso¹,

Eddy²,

Odiongenyi³

2009

Port. Electrochim. Acta

123

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The corrosion inhibition of mild steel in H 2 SO 4 in the presence of methocarbamol was studied using thermometric and gasometric (hydrogen evolution) methods. The study revealed that the corrosion rate increases with temperature, time and concentration of H 2 SO 4 . Addition of methocarbamol to the corrodent solution lowered the corrosion rate of mild steel. Inhibition efficiency (%I) of methocarbamol was found to increase with concentration and decreased with temperature. Adsorption of methocarbamol molecule on mild steel surface was found to obey the Langmuir adsorption isotherm. The phenomenon of physical adsorption is proposed from the obtained thermodynamic parameters.

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“…These values ranged from -38.2481 to 52.3433 kJ/mol, indicating that the adsorption of ethanol extract of vernonia amygdalina on mild steel surface is exothermic [17][18][19]. Also, since the reactions were carried out under constant pressure, the heat adsorbed is also equal to the enthalpy change [22][23]. C/θ = 1/k + C (10) which can also be written as follows, log(C/θ) = logC-logK (11) By plotting values of log(C/θ) versus logC, linear plots were generated (Fig.…”

Section: Thermodynamics/adsorption Considerationmentioning

confidence: 99%

Corrosion Inhibition and Adsorption Properties of Ethanol Extract of Vernonia Amygdalina for the Corrosion of Mild Steel in H2SO4

Odiongenyi¹,

Odoemelam²,

Eddy³

2009

Port. Electrochim. Acta

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Inhibitive and adsorption properties of ethanol extract of vernonia amygdalina for the corrosion of mild steel were studied using weight loss, thermometric, gasometric and IR methods of monitoring corrosion. The results revealed that ethanol extract of Vernonia amygdalina inhibited the corrosion of mild steel. The inhibition efficiency of the extract increased as the concentration of the extract increases. The inhibitor was found to function by being adsorbed on the surface of mild steel. The adsorption of the inhibitor followed the Langmuir adsorption isotherm. IR spectra of the corrosion product (without inhibitor), the extract and the corrosion product (with the inhibitor) confirmed that ethanol extract of vernonia amygdalina is an adsorption inhibitor. Phytochemical studies also revealed that ethanol vernonia amygdalina contains tannin, saponnins, flavanoid and anthraquinone, all of them contributing to the corrosion inhibition. Physical adsorption mechanism has been proposed from the values of some of the thermodynamic parameters obtained.

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Effect of Schiff Bases Containing Pyridyl Group as Corrosion Inhibitors for Low Carbon Steel in 0.1 M HCl

Cited by 129 publications

References 19 publications

Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium

Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium

Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

Corrosion Inhibition and Adsorption Properties of Ethanol Extract of Vernonia Amygdalina for the Corrosion of Mild Steel in H2SO4

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