Experimental and quantum chemical studies of synthesized triazine derivatives as an efficient corrosion inhibitor for N80 steel in acidic medium

Yadav, Mahendra; Kumar, Sumit; Tiwari, Nidhi; Bahadur, Indra; Ebenso, Eno E.

doi:10.1016/j.molliq.2015.09.019

Cited by 77 publications

(20 citation statements)

References 53 publications

(44 reference statements)

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“…Hence a chemisorption mode of adsorption is more likely. The transition state of Arrhenius equation was used in order to evaluate the enthalpy (∆H*) and entropy (∆S*) of activation as indicating from the following [16]:…”

Section: 3mentioning

confidence: 99%

Tungsten Oxide Nanoparticles as Corrosion Inhibitor of Stainless Steel in Saline Medium

Raheem

Salman

2020

ANJS

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Tungsten oxide (WO3) nanoparticles at various concentrations of 1.7×10-2, 2.5×10-2 and 3.4×10-2 M were electrophoretic deposited onto stainless steel surface for corrosion inhibition investigations with respect to concentration as well as temperature by using potentiostatic polarization technique. Results obtained show that WO3 nano coating was used as a barrier layer for the corrosion protection of stainless steel in saline solution. The morphology of nanoparticles was examined using Scanning Electron Microscopy (SEM).The obtained results indicated that these nanoparticles are good inhibitors. All polarization curves yielded similar behavior pointing to stainless steel corrosion is controlled by the charge transfer process so that the stainless steel dissolution mechanism does not alter due to the presence of the nanoparticles. Generally, increasing the inhibitor concentration and temperatures leads to an increase in the inhibition efficiency. Thermodynamic parameters were calculated, and the energy of activation data obtained of the corrosion reaction was decreased with an increase of the concentration of nanoparticles. It is likely that the adsorption of WO3NP on the surface of stainless steel was chemical in nature.

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Section: 3mentioning

confidence: 99%

Tungsten Oxide Nanoparticles as Corrosion Inhibitor of Stainless Steel in Saline Medium

Raheem

Salman

2020

ANJS

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“…Meanwhile the values of activation entropies (ΔSa) increase and negative in the presence of both inhibitors P1meaning that a decrease in the disorder during the transformation of the reagents into activated complex 71,72 , in the case of P2 the value of ΔSa high and positive meaning an increase in the disorder 73 .…”

Section: Mediummentioning

confidence: 99%

Novel pyrazole derivatives as inhibitors of stainless steel in 2.0M H2SO4 media: Electrochemical Study

et al. 2020

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Metallic materials are well known and widely used in various industrial sectors. However, they can be easily corroded in various aggressive environments. The protective action of stainless steel by two organic pyrazole compounds: {1-amino-5,10-dioxo-3-(p-tolyl)-5,10-dihydro-1H-pyrazolo[1,2-b]phthalazine-2-carbonitrile} and {1-amino-3-(2-chlorophenyl)-5,10-dioxo-5,10-dihydro-1H-pyrazolo[1,2-b] phthalazine-2-carbonitrile} in H2SO4 2.0M medium was studied using the electrochemical technics (Electrochemical Impedance Spectroscopy (EIS), potentiodynamic polarization), Scanning Electron Microscopy (SEM) and Energy Dispersion X-ray spectroscopy (EDX). Polarization curves indicate that both compounds act as anodic inhibitors. A suitable equivalent electrical circuit model was used to calculate the impedance parameters. The adsorption study showed that these compounds are adsorbed to the steel surface according to the adsorption isotherm of Langmuir. Effect of temperature was also investigated and activation parameters were evaluated.

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“…Where, icorr is the corrosion current density, N is the Avogadro number, h is the Planck's constant, R is the molar gas constant and T is the absolute temperature. Equation (4) may be rearranged into linear form as : (5) ∆H and ∆S values were obtained respectively, from the slope and intercept of the plot of lnicorr against 1/T as show in Fig.-4, and the data obtained are given in Table- The negative values of ∆S reveal that the activated complex in the rate determining step represents association rather than the dissociation step, this means a decrease in disorder take place 12,13 . …”

Section: Kinetics Of Corrosionmentioning

confidence: 99%

Inhibiting Effects of L-Tryptophan on the Carbon Steel Corrosion in Alkaline Saline Solution

2017

RJC

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The inhibiting effect of L-tryptophan, that considered as an eco-friendly compound on the corrosion of carbon steel in saline solution ( 3.5% NaCl) at pH 11 was investigated potentiostatically at five temperatures in the range 293-313 K. Five concentrations of inhibitor were tested ranging from 5×10 -4 to 1×10 -2 mole L -1 . The addition of Ltryptophan to alkaline sodium chloride solution lowered the corrosion feasibility of the alloy. On the other hand, the corrosion feasibility increased with the rise of temperature. Carbon steel corrosion rate in the saline solution was decreased on increasing L-tryptophan concentration reflecting the inhibiting effect of L-tryptophan when it is present at high concentration in the saline solution. The efficiency of inhibition (%IE) of L-tryptophan increased with increasing the concentration of the inhibitor attaining a maximum value of 71.72 % when the L-tryptophan concentration in the saline solution became 1×10-2 mole L -1 , and decrease with the rise of temperature. Adsorption of L-tryptophan on the surface of carbon steel was considered to obey Langmuir isotherm. Gibbs free energy of adsorption of L-tryptophan on steel was -29.07 kJ mol -1 indicates a physisorption of the inhibitor on the surface of carbon steel alloy. Quantum mechanical study using DFT method with B3LYP/6-31G basis set was applied to achieve good relation between the inhibition efficiency and the chemical structure of L-tryptophan.

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Experimental and quantum chemical studies of synthesized triazine derivatives as an efficient corrosion inhibitor for N80 steel in acidic medium

Cited by 77 publications

References 53 publications

Tungsten Oxide Nanoparticles as Corrosion Inhibitor of Stainless Steel in Saline Medium

Tungsten Oxide Nanoparticles as Corrosion Inhibitor of Stainless Steel in Saline Medium

Novel pyrazole derivatives as inhibitors of stainless steel in 2.0M H2SO4 media: Electrochemical Study

Inhibiting Effects of L-Tryptophan on the Carbon Steel Corrosion in Alkaline Saline Solution

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