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 ANTI-CORROSION PROPERTIES OF BENZOTHIAZOLE DERIVATIVES FOR MILD STEEL IN 1M H2SO4 SOLUTION(Chemical Science Review and Letters, 2014) Hemapriya V; Parameswari K; Chitra SThe corrosion inhibition performance of benzothiazole derivatives namely, 2-phenylbenzothiazole(PBT), 2-(4- methoxy-phenyl)benzothiazole(MPB) and 2-(3,4,5- trimethoxy-phenyl)benzothiazole(TPB) on mild steel in 1M H2SO4 has been studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy. The experimental results showed that the inhibition efficiency increases with increase in inhibitor concentration but decreases with increasing temperature. The inhibition has been assumed to occur via adsorption of inhibitors on mild steel surface. This is supported by the results obtained from scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Adsorption of inhibitors on mild steel surface follows Langmuir adsorption isotherm. The activation energy and free energy of adsorption for the inhibition reaction support the mechanism of physical adsorption. Potentiodynamic polarization measurements indicate that the studied benzothiazole derivatives act as mixed inhibitors. Quantum chemical calculations have been performed and quantum chemical indices were calculated to supplement the experimental results.Item 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 SThe 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 discussedItem INHIBITING EFFECTS OF BENZOTHIAZOLE AMINE SCHIFF BASES ON THE CORROSION OF MILD STEEL IN ACID ENVIRONMENT(International Journal of Recent Scientific Research, 2014-08) Hemapriya V; Parameswari K; Chitra SThe corrosion inhibition of mild steel in 1M H2SO4 solution by Benzothiazol-2-yl- benzylidene amine (BBA) & 2-(Benzothiazol-2-yliminomethyl)-phenol (BIP) has been studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy. The experimental results showed that the inhibition efficiency increases with increasing inhibitor concentration but decreases with increasing temperature. The adsorption of inhibitors on the mild steel surface obeyed the Langmuir adsorption isotherm. Potentiodynamic polarization curves revealed that the compounds act as mixed type inhibitors. The impedance measurements showed a change in the charge transfer resistance and double layer capacitance indicating adsorption of inhibitors on the mild steel surface. Surface analysis of mild steel has been carried out using scanning electron microscopy (SEM) with EDX and Fourier transform infrared (FT-IR) spectroscopy. Quantumchemical calculations have been performed and several quantum chemical indices were calculated in order to complement the experimental resultsItem 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 ISOXAZOLINE DERIVATIVES AS CORROSION INHIBITORS FOR MILD STEEL IN ACID MEDIA(International Academy of Science, Engineering and Technology (IASET), 2014) Anusuya N; Sounthari P; Saranya J; Kiruthika A; Parameswari K; Chitra SInhibition of corrosion of mild steel in 1M H2SO4 by isoxazolines was studied using gravimetric, electrochemical techniques and scanning electron microscopy. The addition of all the isoxazolines to the corrosive medium reduced the corrosion rate. The effect of temperature on the corrosion behavior of mild steel was studied in the temperature range 303K - 333K for 1M H2SO4 with optimum concentration of the synthesized isoxazolines. Thermodynamic parameters were also calculated to know the mechanism of corrosion inhibition. Polarization studies showed that all the isoxazolines function as mixed inhibitors but predominantly act as anodic inhibitors. The percentage of iron in the corrodent solution was determined by atomic absorption spectroscopy. The protection of mild steel specimens by isoxazolines was further well supported by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX) analysis.Item SYNTHESIS, CHARACTERIZATION, SINGLE CRYSTAL XRD, IN VITRO ANTIMICROBIAL AND CYTOTOXICITY STUDY OF TRIS(ETHYLENEDIAMINE)COBALT(III)CHLORIDE OXALATE TRIHYDRATE(Arabian Journal of Chemistry, Elsevier, 2019) JoneKirubavathy S; Velmurugan R; Parameswari K; Chitra SThe complex tris(ethylenediamine)cobalt(III)chloride oxalate trihydrate [Co(en)3] Cl(C2O4)Æ3H2O crystallizes in the monoclinic space group C2/c with the following unit cell parameters a = 19.9318 (13), b = 9.3344 (4), c = 19.0881 (13) A˚ b = 96.846(3), Z = 8. The crystal structure was solved by direct methods and refined by full matrix least squares procedures to a final R value of 0.0314 for 4330 observed reflections. The reported cobalt complex is six co-ordinated through amine nitrogen with distorted octahedral geometry. There are uncoordinated chloride and oxalate ions along with the water molecules. In-vitro antimicrobial activity was studied against various test organisms and found to be good. From in-vitro cytotoxic activity of the synthesized complex, the IC50 value was found to be 55.85 lg/mlItem SYNTHESIS, CHARACTERIZATION, SINGLE CRYSTAL XRD AND PHARMACOLOGICAL EVALUATION OF CU(II), CO(II), NI(II) AND ZN(II) COMPLEXES OF 2,3-DIFURYLQUINOXALINE(Journal of Chemical and Pharmaceutical research, 2015) JoneKirubavathy S; Velmurugan R; Parameswari K; Chitra SThe transition metal complexes Cu(II), Co(II), Ni(II) and Zn(II) of 2, 3-difuryl quinoxaline have been synthesized and characterized by various physico-chemical techniques viz. elemental analysis, magnetic moment, IR, NMR, TGA, Single crystal XRD and electronic studies. The complexes have found a stoichiometry of 1:2 (M : L), wherein nitrogen in the quinoxaline ring and oxygen in the furyl ring is co-ordinated to the metal. These studies revealed an octahedral geometry for Cu(II) and Co(II) complexes and a square planar geometry for Ni(II) and Zn(II) complexes. The ligand and its complexes were screened for their antibacterial activity against gram positive bacteria and gram negative bacteria namely B. subtilis, S. aureas, E. coli , K. pneumoniea respectively by the disc diffusion method and antifungal activity against M. rubram, A. niger and C. albicans and found to be good. The in-vitro anti cancer activity of the single crystal 2, 3-difurylquinoxaline and its Co(II) complex was screened against the human breast cancer cell line HeLa and the IC50 values are 90.19 and 20.25µg/ml respectivelyItem SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL SCREENING OF CU (II) AND VO (IV) COMPLEXES OF 2, 3- DIPHENYLQUINOXALINE(International Journal of recent scientific research, 2014) Jone Kirubavathy S; Velmurugan R; Parameswari K; Chitra SA new series of transition metal complexes of Cu(II) and VO(IV) were synthesized from the ligand 2,3-diphenyl quinoxaline. The structural features were arrived from the elemental analysis, magnetic susceptibility, molar conductance, FT- IR, UV-Vis, 1H-NMR and ESR spectral studies. The data show that the Cu (II) and VO(IV) complexes are of ML2 type . The UV-Vis., magnetic susceptibility and ESR spectral data suggests a square planar geometry for Cu (II) complex and a square pyramidal geometry for VO(IV) complex. The antimicrobial screening tests were also recorded and gave good results in the presence of ligand system with the metal.Item 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 MThe 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.