S No Title Page 1 Influence of citric acid-Zn 2+ System on Inhibition of Corrosion of Mild Steel in Simulated Concrete Pore Solution, 2 Corrosion inhibition by flower extracts-An over view 3 Corrosion inhibition by dyes from plants 5 Corrosion Inhibition by Oxyanions
P Nithya, Devi, J Sathiyabama, S Rajendran, Joseph Rathish, S Santhana Prabha, M Sangeetha, S Rajendran, J Sathiyabama, T Umasankareswari, A Krishnaveni, R Joany
(+14 others)
unpublished
Corrosion of metals is prevented by flower extracts. Weight loss and electrochemical studies have been employed to evaluate the corrosion inhibition efficiencies of the extracts of flowers. Usually aqueous extracts are conveniently employed. Adsorption of active principle on the metal surface obey Langmuir, temkin and frenlich absorption isotherm. Thermodynamic parameters have been calculated. Protective film has been analysed by SEM, EDX, AFM and FTIR. Mild steel in the metal mostly employed
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... these studies. Many organic compounds containing hetero atoms like sulphur, nitrogen and oxygen have been used as corrosion inhibitors. However, the environmental needs have prompted the researchers to make use of environmental friendly green inhibitors. The synthetic dyes have been used as corrosion inhibitors however, they have been discarded due to environmental hazards. Natural dyes, extracted from plant materials have been used as corrosion inhibitors. For this purpose dyes such as berberine, lawsone and curcumin extracted from plant materials have been used as corrosion inhibitors. The inhibition efficiency has been evaluated by electrochemical studies and weight loss method. The protective film has been analysed by FTIR spectra, fluorescence spectra, SEM and EDAX. The inhibition potentials of Emblica officinalis leaves extract was investigated by evaluating the corrosion behavior of mild steel immersed in 1N HCl solution containing varied concentration of the extract ranging from 200ppm to 1000ppm. Weight loss, corrosion rate, percentage inhibition efficiency, surface coverage and Langmuir adsorption isotherm were utilized to evaluate the corrosion inhibition and 29-45 adsorption properties of the extract. The inhibition efficiency increased with increase in concentration of the inhibitor and the highest %IE was obtained at 1000ppm. The adsorption of the plant extract on the mild steel surface was found to obey Langmuir adsorption isotherm. UV, Fourier transform infrared spectroscopy, Scanning electron microscopic studies provided the confirmatory evidence of improved surface condition, due to adsorption, for the corrosion protection. Oxyanion contains electrons on oxygen atom. These electrons can be released to the metal surface and thus corrosion of metals can be prevented. Corrosion of many metals have been prevented by oxyanions in acidic, basic and neutral medium. Usually weight loss method and electrochemical studies have been employed to evaluate the corrosion inhibition efficiency of oxyanion. The protective film formed on metal surface in presence of oxyanion have been analysed by FTIR spectra, SEM, EDAX, Auger electron spectroscopy (AES), piezo-electrokinetic (PEK) method, cyclic potentiodynamic polarization (CPP) measurement, linear polarization resistance (LPR) techniques and XRD pattern.
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