F-KCW-Department Publications
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Item THE INHIBITION EFFECT OF THIAZINE COMPOUNDS TOWARDS THE CORROSION OF MILD STEEL IN SULPHURIC ACID MEDIA(Rasayan Journal of Chemistry, 2012-12) Hemapriya V; Parameswari K; Bharathy GThe inhibition effect of thiazines (AT, CBT & NBT) on mild steel corrosion in 1M sulphuric acid (H2SO4) was investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The result showed that corrosion rate was significantly decreased in presence of the inhibitors. The inhibiting action increases with the concentration of thiazine compounds to attain 99 % at 0.5mM of (AT). The increase in temperature leads to a decrease in the inhibition efficiency of the compounds in the temperature range 308-353K. Adsorption of thiazines on the mild steel surface in 1M H2SO4 obeyed the Langmuir adsorption isotherm. EIS measurements showed an increase in charge transfer resistance (Rct) with concentration. Potentiodynamic polarization study showed that the inhibitors act as mixed type, controlling both the anodic and cathodic reactions. Surface analysis by SEM confirmed the formation of adsorbed protective layer of the inhibitor on the steel surface.Item CORROSION INHIBITION EFFECT OF HYDROXY PYRAZOLINE DERIVATIVES ON MILD STEEL IN SULPHURIC ACID SOLUTION TOGETHER WITH QUANTUM CHEMICAL STUDIES(University of Mohammed Premier, 2015-03-13) Anusuya N; Sounthari P; Saranya J; Parameswari K; Chitra SInhibition potential of synthesized pyrazoline derivatives on the corrosion inhibition of mild steel in 1M H2SO4 solution have been evaluated and studied by gravimetric, Tafel polarization, electrochemical impedance spectroscopy techniques and the quantum chemical studies using density functional theory (DFT). The results showed that the inhibition efficiency of the investigated compounds depend on the concentration and nature of the inhibitor. The effect of temperature on the corrosion behavior of mild steel in 1M H2SO4 without and with the inhibitors was studied in the temperature range 303 to 333 K. Some activated thermodynamic parameters were computed and discussed. Polarization studies showed that all the pyrazolines function as mixed inhibitor, but predominantly act as cathodic type. The surface morphology of inhibited mild steel was analyzed by scanning electron microscope technology with energy dispersive X-ray spectroscopy (SEM-EDX). FT-IR spectroscopic analysis was used to obtain information on bonding mechanism between the metallic surface and the inhibitors. Quantum chemical parameters such as highest occupied molecular orbital energy (EHOMO), lowest unoccupied molecular orbital energy (ELUMO), energy gap (∆E) and dipole moment (µ), the softness (σ), the fraction of the electrons transferred from the inhibitor to the metal surface (∆N) and the total energy (TE) have been calculated. It was found that theoretical data support the experimental resultsItem QUANTUM CHEMICAL STUDY ON THE CORROSION INHIBITION PROPERTY OF SOME HETEROCYCLIC AZOLE DERIVATIVES(Oriental Scientific Publishing Company, 2015-08-20) Anusuya N; Sounthari P; Saranya J; Parameswari K; Chitra SQuantum chemical calculations based on density functional theory (DFT) method were performed on heterocyclic azole derivatives as corrosion inhibitors for mild steel in acid media to investigate the relationship between molecular structure of the inhibitors and the corresponding inhibition efficiencies (%). Quantum chemical parameters most relevant to their potential action as corrosion inhibitors have been calculated in the non-protonated and protonated forms in aqueous phase for comparison. Results obtained in this study indicate thatin acidic media, both the protonated and non-protonated forms of the azoles represent the better actual experimental situation.Item POLYESTER-TOBACCO COMPOSITE: A NOVEL ANTICORROSION MATERIAL FOR MILD STEEL IN ACID MEDIUM(American Scientific Publishers, 2014-12-01) Sounthari P; Kavitha T; Kiruthika A; Saranya J; Chitra S; Parameswari K; Yuvaraj HA novel anticorrosion material polyester/tobacco (PES-TOB) composite was prepared via. ultra sonication method. The composite was characterized by FT-IR, TGA and XRD. In this report, we present the comparative corrosion inhibition performance on mild steel in 1 M H2SO4 containing PES and PES-TOB composite. The PES was prepared by condensation of 2,5-bis(4′-aminophenyl-N,N′-(3′-hydroxyphenylazo)-1,3,4-oxadiazole and pimelic acid. The synthesized PES showed only inhibition efficiency up to 38% at 500 ppm. But the corrosion protection performance of the PES-TOB composite was excellent upto 96%, which was monitored by weight loss method, potentiodynamic polarization method, electrochemical impedance spectroscopy and AAS. The surface morphology was examined by scanning electron microscopy.Item THIADIAZOLOPYRIMIDINES AS ACID CORROSION INHIBITORS FOR MILD STEEL(The Corrosion Science Society of Korea, 2011-02-28) Chitra S; Parameswari K; Vidhya M; Kalishwari M; Selvaraj AThe inhibitive action of thiadiazolopyrimidines on mild steel in 1 M H2SO4 has been studied using weight loss, gasometric studies and electrochemical polarization and AC impedance measurements. The effect of temperature on the corrosion behaviour of mild steel in 1 M H2SO4 with optimum concentration of inhibitors was studied in the temperature ranging from 313-333K The adsorption of the inhibitor on the surface of mild steel was found to be exothermic, spontaneous and followed the mechanism of physisorption. The adsorption of these compounds on mild steel surface was found to obey Langmuir adsorption isotherm. The protective film formed on the surface of mild steel by the adsorption of inhibitor in 1 M H2SO4 solution was confirmed by optical microscopic technique. Synergistic effect of halide ions on mild steel in 1 M H2SO4 was studied by weight loss techniqueItem AN INVESTIGATION ON THE TETRAHYDROPYRIMIDINE DERIVATIVES AS ACID CORROSION INHIBITORS FOR MILD STEEL(The Corrosion Science Society of Korea, 2009-04-30) Chitra S; Gayathri N; Parameswari KThe corrosive behavior of mild steel in 0.05 M to 10 M H2SO4 solutions containing different concentrations of tetrahydropyrimidine derivatives (THPM) was investigated using weight loss method, gasometric technique, electrochemical studies which include AC - impedance and potentiodynamic polarization method, atomic absorption studies and synergistic effect. The results obtained reveal that THPM derivatives is an efficient mixed type inhibitor but slightly anodic and it is more effective in reducing corrosion of mild steel in H2SO4 media. The adsorption of the inhibitor on the mild steel surface obeys the Langmuir adsorption isotherm. The thermodynamic parameters of adsorption reveal a strong interaction and spontaneous adsorption of THPM on the mild steel surface. The influence of temperature and inhibitor concentration on the corrosion of mild steel has also been investigated.Item INFLUENCE OF PYRAZOLINES ON THE CORROSION OF MILD STEEL IN 1 M SULPHURIC ACID(PSGR Krishnammal College for Women, 2009) Selvaraj A; Parameswari K; Chitra S; Jayanthi C; Christus SheebaThe corrosion behaviour of mild Steel in 1M Sulphuric acid solution and its inhibition by pyrazolines was studied using weight-loss method at various temperatures(303-333k), electrochemical techniques, and gasometric method. The data revealed that the pyrazolines act as good inhibitor in the acid environment. The percentage inhibition efficiency of pyrazoline increased with increase in inhibitor concentration. Potentiodynamic polarization studies reveal that the pyrazolines act as anodic type inhibitors. Adsorption on the mild steel surface followed Langmuir adsorption isotherm. The thermodynamic parameters such as activation energy(Ea) and free energy of adsorption(ΔGads) were calculated. The synergistic effect of iodide ions on the performance of one of the pyrazolines was also studied.