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Dindigul, India

Anbarasi C.M.,Jayaraj Annapackiam College for Women | Rajendran S.,Corrosion Research Center
Chemical Engineering Communications | Year: 2012

Inhibition of corrosion of carbon steel in dam water by octanesulfonic acid as its sodium salt (SOS) in the absence and presence of a bivalent cation zinc ion (Zn 2+) has been investigated using weight loss, potentiodynamic polarization, AC impedance spectra, Fourier transform-infrared spectroscopy (FT-IR), fluorescence spectra, scanning electron microscopy (SEM), and energy dispersive X-ray detection (EDAX) measurements. The formulation consisting of 250 ppm of SOS and 30 ppm of Zn 2+ offers 88% inhibition efficiency (IE) to carbon steel. The influence of sodium potassium tartrate on the IE of the SOS-Zn 2+ system has been evaluated. Polarization study reveals that SOS-Zn 2+ system controls the anodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the protective film formed on the metal surface has been analyzed by FT-IR spectra, SEM, and EDAX analysis. © 2012 Copyright Taylor and Francis Group, LLC. Source


Nithya A.,G T N Arts College | Rajendran S.,G T N Arts College | Rajendran S.,Corrosion Research Center
Bulgarian Chemical Communications | Year: 2010

The inhibition efficiency of ethylphosphonic acid (EPA) in controlling corrosion of carbon steel, immersed in an aqueous solution containing 120 ppm of Cl- and sulphate ion, has been evaluated by weight loss method in the absence and presence of Zn2+. Weight loss study reveals that the formulation consisting of 250 ppm of EPA, 50 ppm of Zn2+ and 73.58 ppm of sulphate ion has 84% inhibition efficiency in controlling corrosion of carbon steel, immersed in an aqueous solution containing 120 ppm of Cl -. Synergism parameters suggest that a synergistic effect exists between EPA and Zn2+. Polarization study reveals that this system functions as an anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protection film consists of Fe2+-EPA complex. This is confirmed by UV-visible reflectance spectra. © 2010 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria. Source


Antony N.,Holy Cross College | Benita Sherine H.,Holy Cross College | Rajendran S.,Corrosion Research Center
Portugaliae Electrochimica Acta | Year: 2010

The inhibition efficiency of sodium dodecyl sulfate (SDS) in controlling corrosion of carbon steel in aqueous solution containing 120 ppm of Cl- in the presence and absence of Zn2+ has been evaluated by weight loss method. The formulation consisting of 300 ppm of SDS and 75 ppm of Zn2+ gives 93 % inhibition efficiency. A synergistic effect exists between SDS and Zn2+. As the immersion period increases, the inhibition efficiency of SDS-Zn2+ decreases. Polarization study reveals that this formulation controls both the anodic and cathodic reactions. AC impedance spectra reveal that a protective film is formed on the metal surface. Source


Narayanasamy B.,Thiagarajar College of Engineering | Rajendran S.,Corrosion Research Center
Progress in Organic Coatings | Year: 2010

Polyaniline (PANI) and poly(N-methylaniline) (PNMA) have been electrodeposited on mild steel from oxalic acid bath using cyclic voltammetric technique. Pretreatments like passivation and primer polymer coatings were required for effective coating. Differently stacked composite polymer layers on the metal surface by layer-by-layer approach have also been obtained and their properties have been compared with their corresponding copolymer coatings. FTIR study confirms the formation of electroactive polymer compounds on mild steel. Evaluation of these coatings in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy reveals significant corrosion resistant behavior. Relatively higher corrosion protection is exhibited by copolymer coatings and composite-bilayer coatings than the corresponding homopolymer coatings. The composite metal-PANI-PNMA layer shows higher stability and better protection than the metal-PNMA-PANI layer. © 2009 Elsevier B.V. All rights reserved. Source


Sahayaraj J.W.,Jeppiaar Engineering College | Amalraj A.J.,Peiryar Evr College | Rajendran S.,Corrosion Research Center | Vijaya N.,Vellalar College for Women
E-Journal of Chemistry | Year: 2012

The inhibition efficiency (IE) of sodium molybdate (SM) in controlling corrosion of carbon steel in an aqueous solution containing 120 ppm of Cl -, in the absence and presence of Zn 2+ has been evaluated by weight-loss method. A synergistic effect exists between SM and Zn 2+ when the concentration of Zn 2+ is 25 ppm and above. Inhibition efficiencies obtained are greater than 85. Antagonistic effect exists between SM and Zn 2+ when the concentration of Zn 2+ is 10 ppm and below. The SM-Zn 2+ system shows excellent IE up to third day. Above third day IE decreases. Acceleration of corrosion takes place. Excellent IE is shown at pH 5,7 and 12. At pH 9, IE decreases since Zn 2+ is precipitated as Zn(OH)in the bulk of the solution. Polarization study reveals that SM-Zn 2+ system functions as a mixed inhibitor. FTIR spectra reveal that the protective film consists of Fe 2+-SM complex and Zn(OH) © 2012 Hindawi Publishing Corporation. Source

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