New synthesised pyridazine derivatives as effective inhibitors for the corrosion of pure iron in HCl medium

Chetouani, A.; Hammouti, B.; Aouniti, A.; Benchat, N.; Hadda, Taïbi Ben

doi:10.1016/s0300-9440(02)00123-6

Cited by 117 publications

(63 citation statements)

References 16 publications

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“…This supports the fact that though there are some slight irregularities in the order in some cases, researchers had proposed that the adsorption on the metal surface depends mainly on the physicochemical properties of the inhibitor group, such as the functional groups, electron density of the donor atom and p-orbital character. The molecular electronic structure and the number of adsorption active centers such as S, N, and O atoms, the molecular size, the mode of adsorption, the formation of metallic complexes, and the projected area of the inhibitor on the metallic surface (degree of surface coverage) also affect the inhibition efficiency [4,15,28,102]. Reportedly, excellent corrosion inhibitors are usually organic compounds which not only offer electrons to unoccupied orbital of the metal but also accept free electrons from the metal [22,30].…”

Section: Resultsmentioning

confidence: 99%

“…The factors affecting the adsorption of these molecules, such as functional groups, steric factor, molecular size, electron density at the donor atoms and orbital character of donating electrons had been considered and discussed in terms of their inhibiting abilities. The inhibition efficiency has been closely related to the inhibitor adsorption abilities and the molecular properties for different kinds of organic compounds [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The power of the inhibition depends on the molecular structure of the inhibitor.…”

Section: Introductionmentioning

confidence: 99%

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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

147

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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

147

View full text Add to dashboard Cite

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“…The sulphur atom provides a high electron density and it was found that E% increases with electron density [7]. Indeed, Chetouani et al [29,30] have reported the importance of sulphur atom in the drastic change of adsorption mechanism. Furthermore, Brandt et al [31] reported that the sulphur atom represents the active centre of aliphatic sulphides in their interaction with the metal surface.…”

Section: Weight Loss Testsmentioning

confidence: 99%

New Mechanism Synthesis of 1,4-Benzothiazine and its Inhibition Performance on Mild Steel in Hydrochloric Acid

Aloui¹,

Forsal²,

Sfaira³

et al. 2009

Port. Electrochim. Acta

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Abstract1-(3-methyl-4H-1,4-benzothiazin-2-yl)ethanone (1,4-BT) was synthesised via a new mechanism. 1,4-BT was thereafter tested as corrosion inhibitor of mild steel in hydrochloric solution at 293 K by weight loss measurements and electrochemical techniques (potentiodynamic polarisation, polarisation resistance, impedance spectroscopy (EIS)). Inhibiting efficiency (E%) increased with concentration and reached highest values up to 98% even at low concentration with changing the mechanism of the corrosion process. Results obtained showed that the inhibitor studied was an efficient inhibitor, especially in cathodic domain. The temperature effect on the corrosion behaviour of mild steel in 1 M HCl with and without 1,4-BT at 5 10 -3 M was studied in the temperature range from 293 to 333 K. E% remains the same even at high temperature. The adsorption free energy and activation parameters for the mild steel dissolution reaction, in the presence of 1,4-BT, were determined. 1,4-BT is adsorbed on the mild steel surface according to a Langmuir isotherm adsorption model.

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“…This is due to the fact that, adsorption and the degree of surface coverage of inhibitor on the mild steel increases with the inhibitor concentration, thus the mild steel surface gets efficiently separated from the medium [20]. The protective property of these compounds is probably due to the interaction between p electrons and hetero atoms with positively charged steel surface [21].…”

Section: Effect Of Inhibitor Concentrationmentioning

confidence: 99%

“…NHeterocyclic compounds are well qualified to play more protection for steel corrosion [7]. Many N-heterocyclic compounds such as derivatives of pyrazole [8], triazole [9], tetrazole [10], imidazole [11], pyridine [12], pyrimidine [13][14][15], and pyridazine [16] has been reported as effective corrosion inhibitors for mild steel in acidic media. The heterocyclic compounds containing nitrogen atoms can easily be protonated in acidic medium to exhibit good inhibitory action on the corrosion of metals in acid solutions.…”

Section: Introductionmentioning

confidence: 99%

Influence of some synthesized pyrimidine derivatives on corrosion inhibition of mild steel in hydrochloric acid medium

Gurudatt

Mohana

2014

Eur. J. Chem.

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KEYWORDSThe influence of four newly synthesized pyrimidine derivatives on the corrosion inhibition of mild steel in 0.5 M HCl solution is studied using mass loss and electrochemical techniques. The corrosion rate was found to depend on concentration and temperature of the medium. Adsorption of all the four inhibitors obeys Langmuir isotherm model. Polarization curves indicated that the studied inhibitors are of mixed type. Electrochemical impedance spectroscopy explains the mechanism of inhibitor's action. Various activation and adsorption thermodynamic parameters were calculated and discussed. The results obtained from weight loss and electrochemical studies are in good agreement with each other. The variation in inhibitive efficiency mainly depends on the type and nature of the substituents present in the inhibitor molecule. InhibitionMild steel Weight loss Polarization Scanning electron microscopy Electrochemical impedance spectroscopy

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New synthesised pyridazine derivatives as effective inhibitors for the corrosion of pure iron in HCl medium

Cited by 117 publications

References 16 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

New Mechanism Synthesis of 1,4-Benzothiazine and its Inhibition Performance on Mild Steel in Hydrochloric Acid

Influence of some synthesized pyrimidine derivatives on corrosion inhibition of mild steel in hydrochloric acid medium

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