F-KCW-Department Publications

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Author: search.filters.author.Parameswari KSubject: search.filters.subject.Corrosion

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    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 G
    The 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.
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    CORROSION BEHAVIOR OF MILD STEEL IN HYDROCHLORIC ACID SOLUTION IN PRESENCE OF NICOTINIC ACID DERIVATIVES
    (International Journal of Current Research, 2014-01) Hemapriya V; Savithri K; Parameswari K; Chitra S
    The inhibition effect of the synthesized organic inhibitor namely its benzylidine derivative investigated using weight loss, measurements. The inhibition efficiencies obtained from all methods employed are in good agreement with each other. The obtained results show that the compounds NAH and NABH are very good inhibitor solution. The inhibition efficiency increases with increase of inhibitor concentration. Changes in impedance parameters (R surface, leading to the formation of a protective film. Tafel polarization measurements showed that the inhibitors are mixed type. Adsorption of the inhibitor on the surface of the mild steel in 1M hydrochloric acid was found to obey Langmuir’s adsorpti energy of adsorption process were calculated and discussed
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    CORROSION INHIBITION BEHAVIOR OF BENZOTHIAZINE DERIVATIVE ON LOW CARBON STEEL IN ACID MEDIUM: ADSORPTION AND QUANTUM CHEMICAL INVESTIGATIONS
    (World Scientific Publishing Co Pte Ltd, 2018-12-26) Hemapriya V; Chung, Ill-Min; Parameswari K; Chitra S; Kim, Seung-Hyun; Prabakaran M
    The inhibitive performance of 2-[(5-phenyl-1,3,4-oxdiazol-2-yl)methyl]-2H-benzo[b] [1,4] thiazin-3-one (POBT) for low carbon steel corrosion in 1 M H2SO4 has been evaluated by non-electrochrmical, and electrochemical measurements. Efficiency of the inhibitor enhanced with inhibitor concentration and declined with rise in temperature. 92.39% inhibition efficiency was attained using 0.1mM of POBT. Anticorrosive effect of the inhibitor is owing to the adsorption of POBT molecules on the metal surface. Mono layer adsorption of inhibitor was favored by observing the best fit with Langmuir isotherm. Polarization measurements reveal that the inhibitor behaves as mixed type. Surface analysis by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX) confirm the existence of a protective film of POBT on low carbon steel surface. Quantum chemical parameters obtained using density functional theory (DFT) method complements the above results.
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    ASTER KORAIENSIS AS NONTOXIC CORROSION INHIBITOR FOR MILD STEEL IN SULFURIC ACID
    (Elsevier, 2017-08-25) Prabakaran M; Kim, Seung-Hyun; Mugila N; Hemapriya V; Parameswari K; Chitra S; Chung, Ill-Min
    Inhibition efficiency of Aster koraiensis leaf extract toward corrosion of mild steel in 1 M H2SO4 solution was investigated using weight loss, electrochemical, FT-IR, SEM, and EDX methods The individual phenolic compounds present in A. koraiensis extract were identified. Maximum efficiency of 90.53% was achieved at 2000 ppm of the extract. The corrosion kinetic parameters determined from the polarization curves indicated that the extract acted as a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. SEM investigations confirmed the formation of inhibition layer unto the metal surface by compounds present in the extract.
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    DRY AND WET LAB ANALYSIS ON BENZOFUSED HETEROCYCLIC COMPOUNDS AS EFFECTIVE CORROSION INHIBITORS FOR MILD STEEL IN ACIDIC MEDIUM
    (Elsevier, 2016-08-25) Hemapriya V; Prabakaran M; Parameswari K; Chitra S; Kim, Seung-Hyun; Chung, Ill-Min
    The influence of two benzofused heterocyclic compounds, namely 2-phenylquinazolin-4(3H)-one(PQO) and 2-phenyl-4H-benzo[d]oxazin-4-one(POO) in controlling mild steel corrosion in 1 M H2SO4 solution was investigated using gravimetric and electrochemical methods. The experimental results revealed that both the inhibitors inhibit corrosion and their inhibition efficiency follows the order PQO > POO. A mixed mode of inhibition from polarization and a charge transfer mechanism from impedance study in the absence and presence of inhibitors were found. The passive film formed on the mild steel surface was characterized using SEM-EDX. Quantum chemical parameters derived using DFT performed at B3LYP/6-31G(d, p) level were used to correlate the molecular structure.
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    CORROSION INHIBITION OF MILD STEEL IN 1MH2SO4 BY THIADIAZOLE SCHIFF BASES
    (Elsevier, 2015-06) Dasami P M; Parameswari K; Chitra S
    Two novel Schiff bases derived from heterocyclic amines and aldehydes were synthesized and evaluated as corrosion inhibitors for mild steel in 1MH2SO4 by mass loss and electrochemical techniques. Inorder to understand the mechanism of inhibition, adsorption isotherms were tested. The studies showed that the inhibition efficiency depends on concentration of inhibitor and temperature of measurements. Electrochemical studies showed that the inhibitors behave as mixed type. Quantum chemical studies were used to substantiate the experimental results.
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    EVALUATION OF THE INHIBITIVE CHARACTERISTICS OF 1,4-DIHYDROPYRIDINE DERIVATIVES FOR THE CORROSION OF MILD STEEL IN 1M H2SO4
    (The Corrosion Science Society of Korea, 2013-04-30) Sounthari P; Kiruthika A; Sai Santhoshi J; Chitra S; Parameswari K; Selvaraj A
    The present investigation deals with the corrosion inhibition of mild steel in 1M H2SO4 with 1, 4-dihydro pyridine and its derivatives prepared using microwave activation method. The synthesis of inhibitor was confirmed by IR spectra. The effect of 1, 4-dihydropyridine derivatives on the corrosion inhibition of mild steel in 1M H2SO4 was studied using weight loss and electrochemical polarization techniques. Influence of temperature (303-333K) and synergistic effect of halide ions (I-, Br- and Cl-) on the inhibition behaviour was also studied. Corrosion products on the metal surface were analyzed by scanning electron microscopy (SEM) and a possible mechanism of inhibition by the compounds is suggested. Thermodynamic parameters were calculated using weight loss data in order to elaborate the mechanism of corrosion inhibition. Polarization measurements revealed that the studied compounds acted as mixed type inhibitor but slightly anodic in nature. Electrochemical impedance measurements revealed that the compounds were adsorbed onto the carbon steel surface and the adsorption obeyed the Langmuir adsorption isotherm. The synergistic effect of halide ions on the IE increases with increase in concentration. The IE obtained from atomic absorption spectrophotometric studies was found to be in good agreement with that obtained from the conventional weight loss method. SEM revealed the information of a smooth, dense protective layer in presence of the inhibitors
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    THE INFLUENCE OF BENZOYL HYDRAZINE AND SOME OF ITS SUBSTITUENTS ON CORROSION INHIBITION OF CARBON STEEL IN SULPHURIC ACID SOLUTION
    (Emerald Group Publishing Limited, 2004-12-01) Gowrani T; Yamuna J; Parameswari K; Chitra S; Selvaraj A; Subramania A
    The influence of synthesised benzoyl hydrazine and some of its substituents on the inhibition of corrosion of carbon steel in 1M sulphuric acid solution were investigated using weight loss, gasometric measurements, potentiodynamicpolarisation studies and impedance measurements. Corrosion kinetic parameters clearly revealed the fact that the inhibition of corrosion of carbon steel by these compounds was under mixed control. The effect of temperature on the corrosion behaviour of carbon steel in 1M H2SO4 with optimum concentration of inhibitors was studied in the temperature range 40°‐60°C. The activation energy (Ea) and free energy of adsorption (ΔGads0) were determined for all the inhibitors. The adsorption of these compounds on the carbon steel surface from 1M H2SO4 was observed to obey the Langmuir adsorption isotherm relationship.