Dindigul, India
Dindigul, India

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Wilson Sahayaraj J.,Jeppiaar Engineering college | Amalraj J.,EVR College | Rajendran S.,Corrosion Research Center
Proceedings of the International Conference on "Recent Advances in Space Technology Services and Climate Change - 2010", RSTS and CC-2010 | Year: 2010

An eco-friendly inhibitor L-valine (LV) in controlling corrosion of carbon steel in rain water in the absence and presence of Zn2+ has been evaluated by mass loss method. The formulation consisting of 50 ppm of L-valine and 50 ppm of Zn2+ offers good inhibition efficiency of 74%. When 50 ppm of sodium gluconate (SG) is added to the formulations consisting of 50 ppm of LV and 50 ppm of Zn2+, the inhibition efficiency increases from 74% to 98%. As the immersion period increases, the inhibition efficiency does not alter. Polarization study reveals that this formulation functions as a mixed inhibitor. AC impedance spectra reveal the presence of a protective film on the metal surface. The FTIR spectra study lead to the conclusion that the Fe 2+ - LV complex and Fe2+ - SG complex formed on anodic sites of the metal surface controlled the anodic reaction and Zn(OH)2 formed on the cathodic sites of the metal surface controlling the cathodic reaction. The Ecofriendly inhibitor L-valine - Zn2+-SG system may find in cooling water system © 2010 IEEE.


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.


Sahayaraj J.W.,Jeppiaar Engineering College | Amalraj A.J.,Periyar Evr College | Rajendran S.,Corrosion Research Center
Journal of Chemical and Pharmaceutical Sciences | Year: 2016

The accidents due to corrosion can be greatly exaggerated in many industries. The impact of environmental safe inhibitor valine controls the natural damage on the surface of steel immersed in rain water by mass-loss method. The mixture of 50 ppm valine - 50 ppm zinc sulphate system has 74% inhibition efficiency. This is due to the synergistic effect exist between valine and zinc ion. That is, the combined inhibitors show excellent inhibition percentage than individual. The addition of additive increases the inhibition efficiency and prevents the corrosion on metal surface. The polarization study reveals the types of inhibitor. The formation of protective film on the steel specimens confirms by AC-impedance and scanning electron microscopy. The FTIR spectra concluded that the iron - Val complex existed to control the anodic reaction and Zn(OH)2 produced on the cathode region to control the cathodic reaction. The EDS study determines the elements of Val - Zn2+ system in the carbon steel specimens. The formulation consisting of 50 ppm Val-50 ppm Zn2+-100 ppm of CTAB system has 100% biocidal efficiency.


Kavipriya K.,PSNA College of Engineering and Technology | Sathiyabama J.,Corrosion Research Center | Rajendran S.,Corrosion Research Center
International Journal of ChemTech Research | Year: 2015

The inhibition efficiency of diethylenetriamine penta (methylene phosphonic acid) (DTPMP)-Zn2+ system in controlling corrosion of carbon steel in natural sea water has been evaluated by weight-loss and electrochemical method. The formulation consisting of 250 ppm of DTPMP and 50 ppm of Zn2+ has 98% IE. Polarization study reveals that DTPMP-Zn2+ formulation functions as a mixed inhibitor controlling the anodic reaction and cathodic reaction to the same extent. The protective film has been analyzed by FTIR and the surface morphology of the metal surface has been analyzed by an atomic force microscopy. © 2015, Sphinx Knowledge House. All rights Reserved.


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.


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.


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.


Anbarasi C.M.,Jayaraj Annapackiam College for Women | Rajendran S.,Corrosion Research Center
European Corrosion Congress 2011, EUROCORR 2011 | Year: 2011

The inhibition efficiencies(IE)of inhibitor systems constituting various combinations of Sodium 1- Octane sulfonate (SOS)-Zinc ions in controlling corrosion of carbon steel immersed in a dam water have been evaluated by weight loss method. . The formulation consisting of 250 ppm (SOS) of and 30 ppm of Zn 2+ offers 88 % inhibition efficiency to carbon steel. A synergistic effect exists between SOS and Zn 2+.The influence of sodium potassium tartrate and trisodium citrate on the IE of the SOS-Zn 2+ system has been evaluated. As the immersion period increases IE decreases. Polarization study reveals that SOS-Zn 2+ system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by FTIR spectra and SEM analysis. The protective film is found to be UV fluorescent.


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.


Sribharathy V.,Corrosion Research Center | Rajendran S.,Corrosion Research Center
European Corrosion Congress 2010 - EUROCORR 2010 | Year: 2010

The inhibition efficiency (IE) of sodium metavanadate (SMV) in controlling corrosion of carbon steel in an aqueous solution containing 60 ppm of chloride ion has been evaluated by weight loss method. SMV has good IE. 200 ppm of SMV has 98% IE. 50 ppm of SMV has only 48% IE. The IE of this system is improved by addition of various concentrations of spirulina solution (0.5 % aqueous solution). When 2 ml of spirulina solution is added to 50 ppm of SMV, the IE tremendously enhances from 48% to 98%. The 't- test' reveals that this enhancement is statistically significant. The protective film formed on the metal surface has been analyzed by FTIR spectra and fluorescence spectra. The mechanistic aspects of corrosion inhibition have been investigated by electrochemical studies such as polarization study and electrochemical impedance spectra (EIS).

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