Thermodynamic, electrochemical and quantum chemical investigation of some Schiff bases as corrosion inhibitors for mild steel in hydrochloric acid solutions

Ahamad, Ishtiaque; Prasad, R.; Quraishi, M.A.

doi:10.1016/j.corsci.2009.11.016

Cited by 442 publications

(144 citation statements)

References 73 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…(27). The adsorption of protonated Schiff base molecules reduces the rate of hydrogen evolution reaction [74,79,84]. In acidic solutions, the inhibitor can exist as cationic species (Eq.…”

Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

“…Thermodynamic parameters showed that the adsorption of PSCs on the iron surface either in acidic and/or alkaline solutions is physical than chemical one. The adsorption of PSC arises from the donor acceptor interactions between free electron pairs of hetero atoms and p electrons of multiple bonds as well as phenyl group and vacant d orbitals of iron [6,74]. It has been reported that the adsorption of heterocyclic compounds occurs with the aromatic rings sometimes parallel, but mostly normal to the metal surface.…”

Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

“…(27). The adsorption of protonated Schiff base molecules reduces the rate of hydrogen evolution reaction [74,79,84]. In acidic solutions, the inhibitor can exist as cationic species (Eq.…”

Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Figure 4 shows the Nyquist plots that were obtained for (a) steel and (b) copper in the simulated tap water with different BTAH concentrations. The roughness and nonhomogeneity of the specimen surface can affect the variance of the pure capacitive loops [20][21][22] . Figure 4 shows that the increase of the BTAH concentration increases the radius of the capacitive loops as well as the inhibition ef ciencies in all cases.…”

Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 99%

Electrochemical and Quantum Chemical Studies of 1, 2, 3-Benzotriazole as Inhibitor for Copper and Steel in Simulated Tap Water

Kim

2017

Mater. Trans.

View full text Add to dashboard Cite

The corrosion inhibition effect of benzotriazole on copper and steel in simulated tap water was investigated by using potentiodynamic polarization, electrochemical impedance spectroscopy and a quantum chemistry analysis. The corrosion inhibition ef ciency for copper and steel was accordingly increased with an increasing of the benzotriazole concentrations. However, the electrochemical test showed a signi cant difference between the inhibition ef ciency of copper and steel. From molecular theory and the adsorption isotherm, the difference between the d-orbital structure of copper and steel affects the adsorption stability of benzotriazole on the metal surface. This postulation is well correlated with the results of the quantum chemical analysis.

show abstract

“…The adsorption of plant extract on carbon steel surface reduces its electrical capacity as they replace the water molecules and other ions adsorbed at the interface surface leading to the formation of a protective adsorption layer on the metal (working electrode) surface which increases the thickness of the electrical double layer. The thickness of the protective layer (d) is related to C dl in accordance with Helmholtz model, given by the following equation [37]:…”

Section: Electrochemical Impedance Spectroscopy (Eis) Testsmentioning

confidence: 99%

Mitigation of corrosion of carbon steel in acidic solutions using an aqueous extract of Tilia cordata as green corrosion inhibitor

2016

View full text Add to dashboard Cite

The effectiveness of using Tilia cordata extract as a green corrosion inhibitor for carbon steel in 1 M hydrochloric acid solutions was demonstrated by employing some chemical and electrochemical techniques. The surface morphology of C-steel specimens was examined. The results showed that Tilia cordata has corrosion inhibition characteristics with efficiency of 96% as the concentration of Tilia cordata extract increased to 300 mg L -1 . Charge transfer resistance (R ct ) value increases while both the capacitance of the double layer (C dl ) and corrosion current (i corr ) values decrease with increasing the extract concentration. The effect of temperature was studied in the range 30-60°C. Some thermodynamic parameters were calculated and discussed. The adsorption of extract on the C-steel surface was found to obey Langmuir adsorption isotherm. Polarization results showed that the investigated extract acts as mixed type inhibitor. All the different used techniques gave similar results.

show abstract

Thermodynamic, electrochemical and quantum chemical investigation of some Schiff bases as corrosion inhibitors for mild steel in hydrochloric acid solutions

Cited by 442 publications

References 73 publications

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

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

Electrochemical and Quantum Chemical Studies of 1, 2, 3-Benzotriazole as Inhibitor for Copper and Steel in Simulated Tap Water

Mitigation of corrosion of carbon steel in acidic solutions using an aqueous extract of Tilia cordata as green corrosion inhibitor

Contact Info

Product

Resources

About