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Item THE INFLUENCE OF BENZOYL HYDRAZINE AND SOME OF ITS SUBSTITUENTS ON CORROSION INHIBITION OF CARBON STEEL IN SULPHURIC ACID SOLUTION(Emerald Publishing Limited, 2004-12-01) Gowrani, T; Yamuna, J; Parameswari, K; Chitra, S; Selvaraj, A; Subramania, AThe 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, potentiodynamic polarisation 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.Item ANTICORROSION PERFORMANCE OF SOME ARYLIDENE-5-PYRAZOLONES FOR MILD STEEL IN SULPHURIC ACID(Bulletin of Electrochemistry, 2005-05) Selvaraj, A; Sudha, K; Anuradha, R; Parameswari, K5-Pyrazolone and four of its 4-arylidene derivatives were synthesized from acetoacetic ester, hydrazine hydrate and aromatic aldehydes, and evaluated as corrosion inhibitors for mild steel by weight loss method, gasometry, polarization measurements and impedance studies. Piperonalidene pyrazolone showed the best results among all the compounds tested even at low concentrations. The compounds act as mixed type inhibitors and their adsorption on steel surface obeys the Langmuir isotherm. The effect of temperature on the corrosion behaviour of steel showed that the inhibition efficiency decreases with increase in temperature (303-333K). Ea and ΔG ads were determined. The synergistic effect due to I- ions on one of the aryldene pyrazolone has also been noted.Item SYNTHESIS AND COMPARATIVE STUDY OF THE INHIBITIVE PROPERTIES OF ISOMERIC SCHIFF BASES AND ITS CYCLISATION PRODUCTS(Journal of Corrosion Science and Engineering, 2006) Thamaraiselvi, N; Parameswari, K; Chitra, S; Selvaraj, AThe corrosion behaviour of mild steel in 1M sulphuric acid solution and its inhibition by Schiff bases and thiazolidinones was studied using weight loss method at various temperatures (303-333K), by electrochemical and non - electrochemical techniques. The percentage inhibition efficiency of the inhibitors increased with increase in inhibitor concentration. Potentiodynamic polarization studies revealed that though the Schiff bases and thiazolidinones act as mixed type inhibitors they are slightly anodic in nature. Adsorption of these inhibitors on the mild steel surface followed the Langmuir adsorption isotherm. The thermodynamic parameters such as activation energy (Ea) and free energy of adsorption (ΔG°ads) were calculated. The synergistic effect of halide ions on the inhibition efficiency of thiazolidinones was also studied.Item A COMPARATIVE STUDY OF THE CORROSION INHIBITIVE PROPERTIES OF PYRIMIDINE DERIVATIVES FOR MILD STEEL (Article)(Hindawi, 2009-03-31) Sathya, P; Parameswari, K; Chitra, S; Selvaraj, AThe influence of pyrimidine derivatives on the corrosion inhibition of mild steel in 1 M H2SO4 was studied using weight loss and electrochemical techniques. These compounds act as good corrosion inhibitors even at low concentration and the inhibition efficiency increased with the increase in inhibition concentration. The corrosion rates have been determined at various temperatures (303-333K) by weight loss measurements. The Rt values obtained from EIS method increased with increase in inhibitor concentration. The potentiostatic polarization results clearly revealed that the inhibitors behave as a mixed type but slightly anodic in nature. The adsorption process was found to obey the Langmuir adsorption isotherm. The synergistic effect of halide ion on the inhibition efficiency increase with increase concentration.Item A COMPARATIVE STUDY OF THE CORROSION INHIBITIVE PROPERTIES OF PYRIMIDINE DERIVATIVES FOR MILD STEEL(Hindawi, 2009-03-31) Sathya, P; Parameswari, K; Chitra, S; Selvaraj, AThe influence of pyrimidine derivatives on the corrosion inhibition of mild steel in 1 M H2SO4 was studied using weight loss and electrochemical techniques. These compounds act as good corrosion inhibitors even at low concentration and the inhibition efficiency increased with the increase in inhibition concentration. The corrosion rates have been determined at various temperatures (303-333K) by weight loss measurements. The Rt values obtained from EIS method increased with increase in inhibitor concentration. The potentiostatic polarization results clearly revealed that the inhibitors behave as a mixed type but slightly anodic in nature. The adsorption process was found to obey the Langmuir adsorption isotherm. The synergistic effect of halide ion on the inhibition efficiency increase with increase concentration.