Mobin M.,Aligarh Muslim University |
Hasan S.K.,Institute of Technology for Women
Journal of Materials and Environmental Science | Year: 2012
The studies include the results and discussion related with reaction of Fe2O3 with Na2SO4 in presence of SO2 (g) at 800 and 900°C. The iron oxides are produced by the oxidation of iron base alloys in many industrial operations. The metal oxide undergoes certain high temperature chemical reactions in presence of a gas (such as SO2) and molten salts (say Na2SO4). The thermo-gravimetric studies had been carried out as a function of variation in Na2SO4 concentration in the mixture. The reaction products were identified by XRD analysis. Surface morphologies of the products are discussed on the basis of metallographic and scanning electron microscopic (SEM) studies.
Hasan S.K.,Institute of Technology for Women |
Mobin M.,Aligarh Muslim University
Portugaliae Electrochimica Acta | Year: 2011
The present paper contains the results relative to the reaction of NiO with Na2SO4 in presence of SO2 (g) at 1100 and 1200 K. Nickel oxide (NiO) is produced by the oxidation of metal alloys in many industrial operations. The oxidation of metal and metal oxides in presence of molten salts and gas environment at high temperature is often called as hot corrosion. In this investigation the studies have been carried out taking into consideration the influence of SO2 partial pressure. The thermo-gravimetric studies have been carried out as a function of Na2SO4 concentration in the mixture. The reaction products identified by XRD analysis and surface morphologies of the products were discussed on the basis of metallographic and scanning electron microscopic (SEM) studies. The pH of the aqueous solutions of the reaction products were measured to observe the changes in the system with varying the Na2SO4 concentration. A quantitative estimation of soluble metal ions has also been carried out with the help of an atomic absorption spectrophotometer. The possibility of chemical reaction is established by thermodynamic calculations of free energies of the reaction products.
Sisodia P.,Institute of Technology for Women |
Khalid Hasan S.,Institute of Technology for Women
Journal of Corrosion Science and Engineering | Year: 2013
Corrosion inhibition of mild steel using extract of leaves, roots and stem bark of coffee plum (Flacourtia jangomas) plant extract in 1M HCl and 0.5 H2SO4 solutions was investigated by weight loss method at 30°C. Corrosion rate decreased significantly in presence of extract and inhibition efficiency increased with increasing concentration of extract. Inhibition efficiency performance followed the trend Leaf extract > Root extract > Stem Bark extract at 5% inhibitor concentration. No considerable changes in inhibition efficiency were observed above 5% in all the cases. The decreased corrosion rate and adsorption behavior have been explained by Langmuir, Temkin and Freundlich adsorption isotherm. The constituents responsible for inhibition were identified by Phytochemical analysis and Fourier Transform Infrared Spectroscopy FTIR spectroscopy. © 2013 University of Manchester and the authors.
Pathak V.K.,Institute of Technology for Women |
Pandey P.R.,Jp University
Rasayan Journal of Chemistry | Year: 2012
Some novel complexes of ligands N - (5-Bromo-Napthyl) -2- mercapto propanamide and N- (5-methoxy Napthyl) - 2- mercapto propanamide with Cu(II), Ni(II) and Co(II) were prepared. The ligands and their metal complexes were characterized by Physico - chemical spectroscopic techniques. The spectral data suggested the deprotonation of thiol (-SH) group and its coordination to the metal ions in complexes. It was also suggested to involve NH group in coordination to the metal ion through nitrogen atom. Further, spectroscopic studies suggested tetrahedral, octahedral Cu(II) complexes, octahedral Ni(II) complexes and square planar as well as octahedral Co(II) complexes. © 2012 RASĀYAN. All rights reserved.
Khalid Hasan S.,Institute of Technology for Women |
Sisodia P.,Institute of Technology for Women
Rasayan Journal of Chemistry | Year: 2011
The inhibition of corrosion of mild steel using Paniala (Flacourtia jangomas) extract in 1M HCl and 0.5 H2SO4 solutions was investigated by weight loss method at 30°C. The result showed mat corrosion rate was significantly decreased in presence of the extract and inhibition efficiency increased with increasing the concentration of extract. In case of HCl maximum inhibition efficiency (98%) was noticed at 5% v/v inhibitor concentration and no considerable change in inhibition efficiency was observed after this concentration and in 0.5M H2SO4, it was found 95% efficiency at the same concentration of inhibitor. At lower concentration of inhibitor, better inhibition was observed in HCl medium as compared to H 2SO4. The decreased corrosion rate was due to adsorption of plant extract which was discussed on the basis of Langmuir and Freundlich adsorption isotherm. Adsorption of Flacourtia jangomas depends on its chemical composition which showed the presence of various compounds like flavonoids, steroids, tannins and phenolic compounds etc. which has oxygen atoms with lone pair electrons for co-ordinate bonding with metal. © 2011 RASAYAN. All rights reserved.
Hasan S.K.,Institute of Technology for Women |
Journal of Corrosion Science and Engineering | Year: 2011
The work presented in this paper deals with the results of studies on reactions of Nickel oxide (NiO) with sodium chloride in flowing Cl2 (g) at 1100 and 1200K. The main objective of the work was to investigate the nature of chemical reactions between nickel oxide and NaCl on the basis of reaction kinetics and the morphologies of the reaction products. The oxides taken into account for the studies were initial scaling products during oxidation of industrial alloys and invariably involved in hot corrosion reactions in presence of molten salts. The thermo gravimetric studies were carried out as a function of NaCl in the mixture. XRD analyses were used to identify the constituents present in the reaction products. Morphologies of the reaction products were discussed on the basis of scanning electron microscopic (SEM) studies. Quantitative estimation of soluble metal species was carried out using an atomic absorption spectrophotometer. The formation of products was investigated by thermodynamic computation of free energies of reaction. © 2011 University of Manchester and the authors.