Corrosion Inhibitory Effects of Some Schiff's Bases on Mild Steel in Acid Media

Sethi, T.; Chaturvedi, Alok; Upadhyay, R. K.; Mathur, S. P.

doi:10.4067/s0717-97072007000300003

Cited by 57 publications

(32 citation statements)

References 11 publications

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“…It is also possible that the inhibitor molecules studied can be adsorbed on the anodic and cathodic sites resulting in deviation from unit gradient. Similar observations have been reported by Sethi et al [116] and other authors [34,117,118]. It has been assumed that organic inhibitors establish their inhibition via adsorption of the inhibitors onto the metal surface.…”

Section: Adsorption Considerationssupporting

confidence: 87%

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 Considerationssupporting

confidence: 87%

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

View full text Add to dashboard Cite

show abstract

“…Although it was reported by Solomon et al, [16] that the plots are linear as depicted by correlation coefficient (R 2 ) values (0.99) as value of unity from the slopes are expected from ideal Langmuir adsorption equation. It has been postulated in the deviation of Langmuir isotherm equation that adsorbed molecules does not interact with one another which [16] claimed not to be true due to large organic molecule in plant extract having polar atoms or groups which can be adsorbed on the cathodic and anodic site of the metal resulting in deviation from unit gradient which also reported by other researcher [30].…”

Section: Adsorption Considerationmentioning

confidence: 90%

The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

Abdulrahman¹,

Ganiyu²,

Kobe³

et al. 2015

IJIRSET

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ABSTRACT:The inhibition of mild steel corrosion in sulphuric acid solution was studied with application of Africa parquetina leaves extract (APLE) using Gravimetric, Gasometric and Thermometric measurements. The phytochemical characterization of the leaves extract were also carried out using Gas chromatography mass spectroscopy (GCMS) and Fourier transformation Infra Red (FTIR) analysis. The result showed the presence of phytochemical compounds and functional groups greatly contributed to the inhibitive strength. The inhibition efficiency at optimum concentration 0.5 g/l was 87.78 % and it was increased with the increase in concentration of APLE but decreased with increase in temperature. The adsorption of inhibitor obeyed Langmuir adsorption isotherm and the free energy of adsorption suggested that it was physisorption. Finally, the Dubinnin-Radushkevich isotherm model also suggested the techniques adopted in the corrosion measurement were in good agreement.

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“…2. The electrochemical corrosion parameters such as corrosion current density (I corr ), corrosion potential (E corr versus SCE), cathodic and anodic Tafel slopes (b a , b c ) the degree of surface coverage (θ) and the inhibition efficiency (IE%= θ×100) obtained by extrapolation of the Tafel lines [15] are shown in Table 1. These results demonstrate that the compound act as an effective inhibitor for mild steel in alkaline NaCl solution.…”

Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 99%

Thermodynamic and Adsorption Isotherm of N,n'-Bis(2,4,6-Trihydroxyacetophenone)-2,2-Dimethylpropandiimine as a Corrosion Inhibitor on Sa-210 Steel in Alkaline Nacl Solution

Dahdele

Danaee

Rashed

2016

J. Chil. Chem. Soc.

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Adsorption isotherm of N,N′-bis(2,4,6-trihydroxyacetophenone)-2,2-dimethylpropandiimine (THAPDP) as an environmentally friendly Salen Ligand corrosion inhibitor on mild steel was studied in alkaline solution (pH=10) containing 3% NaCl. Measurements were carried out using electrochemical and surface techniques. Potentiodynamic polarization curves suggested that this compound was an effective corrosion inhibitor for mild steel and the protection efficiency was increased with the increase in inhibitor concentration. The experimental results indicated that this organic compound was a mixed-type inhibitor. Adsorption on the mild steel surface followed the Langmuir isotherm model. Activation parameters and thermodynamic adsorption parameters of the corrosion process such as E a , ΔH, ΔS, K ads , and ΔG ads were calculated at different temperatures.

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Corrosion Inhibitory Effects of Some Schiff's Bases on Mild Steel in Acid Media

Cited by 57 publications

References 11 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

The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

Thermodynamic and Adsorption Isotherm of N,n'-Bis(2,4,6-Trihydroxyacetophenone)-2,2-Dimethylpropandiimine as a Corrosion Inhibitor on Sa-210 Steel in Alkaline Nacl Solution

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