Experimental and theoretical study for corrosion inhibition of mild steel in normal hydrochloric acid solution by some new macrocyclic polyether compounds

Lebrini, Mounim; Lagrenée, Michel; Vezin, Hervé; Traisnel, Michel; Bentiss, Fouad

doi:10.1016/j.corsci.2006.10.029

Cited by 457 publications

(138 citation statements)

References 31 publications

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“…Recently, density functional theory (DFT) has been used to analyze the characteristics of the inhibitor/surface mechanism and to describe the structural nature of the inhibitor in the corrosion process [31,[56][57][58][59][60][61][62][63][64][65][66][67][68]. Furthermore, DFT is considered a very useful technique to probe the inhibitor/surface interaction as well as to analyze the experimental data.…”

Section: Calculation Methodsmentioning

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

144

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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: Calculation Methodsmentioning

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

144

View full text Add to dashboard Cite

show abstract

“…Table 3 shows the different parameters from the electrochemical impedance measurements for the studied compounds In the light of the obtained results, we can make the following remarks: These impedance diagrams are semi-perfect circles, which are associated with the dispersal of frequency due to the roughness and inhomogeneity of the surface of the electrode [35]. The electrochemical parameters such as R ct , C dl , and η EIS (%) are located in Table 3 in which it is clear that the capacitance of the double layer C dl is decreased with the addition of Q-CH 3 NHyQ and Q-HNHyQ inhibitors.…”

Section: Electrochemical Impedance Measurementsmentioning

confidence: 99%

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

Rbaa¹,

Galai²,

Faydy³

et al. 2018

jmes

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“…This suggests that the impedance of the inhibited substrate increases with fenugreek concentration, which in turn leads to a lower corrosion of Al. Noticeably, these high frequency loops are not perfect semicircles, which can be attributed to the frequency dispersion as a result of the roughness and inhomogeneity of the electrode surface [43]. The dielectric parameters are given in Table 3.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Ennouri¹,

Lamiri²,

Essahli³

2017

Port. Electrochim. Acta

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The corrosion inhibition of aluminum by the extract of Trigonellafoenum-graecum L was studied in a hydrochloric acid 1 M solution using electrochemical polarization measurements and electrochemical impedance spectroscopy (EIS). Three organic solvents, pentane, dichloromethane (DCM) and ethanol, of different polarities, were tested. An inhibition efficiency of 86.6 %, 84.41 %, and 75.77 % was obtained by the addition of 1400 ppm of the extract using three solvents: DCM, ethanol and pentane, respectively. The potentiodynamic curves show that the decrease of aluminum corrosion in the presence of the fenugreek extract in a HCl 1 M solution mainly acts by a mixed process with an anodic tendency for both extracts with ethanol and with pentane; on the other hand, the extract with DCM showed a cathodic tendency. The temperature effect on the corrosion of aluminum indicates that the inhibition efficiency of the natural substance decreases with an increase in temperature. The inhibition efficiency values obtained from the polarization curves are in good agreement with those of EIS.

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Experimental and theoretical study for corrosion inhibition of mild steel in normal hydrochloric acid solution by some new macrocyclic polyether compounds

Cited by 457 publications

References 31 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

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

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