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Devi P.N.,G T N Arts College | Rajendran S.,Corrosion Research Center | Sathiyabama J.,G T N Arts College | Rathish R.J.,PSNA College of Engineering and Technology | And 3 more authors.
Portugaliae Electrochimica Acta | Year: 2015

Concrete is one of the most widely used engineering materials for construction. Its durability is a major problem affecting the service life of the engineering structures. Various technologies such as cathodic protection and the use of corrosion inhibitors are used to improve the durability of reinforced concrete. Various organic and inorganic inhibitors, and also extracts of natural products have been used as corrosion inhibitors. Corrosion resistance of rebars has been evaluated by electrochemical studies such as polarization study and AC impedance spectra. The protective films formed on the metal surface have been analyzed by NMR, FTIR spectra, SEM, AFM and XRD. © 2015, Sociedade Portuguesa de Electroquimica. All rights reserved. Source


Rajendran S.,Corrosion Research Center | Kavipriya K.,Corrosion Research Center | Krishnaveni A.,Yadava Collge | Jeyasundari J.,SVN College | Sribharathy V.,Corrosion Research Center
Portugaliae Electrochimica Acta | Year: 2013

The inhibition efficiency of sodium gluconate (SG)-Zn2+ system in controlling corrosion of carbon steel in sea water has been evaluated by weight-loss method. The formulation consisting of 250 ppm of SG and 75 ppm of Zn2+ has 98% IE. Influence of duration of immersion on the IE of SG-Zn2+ has been evaluated. The mechanistic aspects of corrosion inhibition have been investigated by polarization study and AC impedance spectra. The protective film has been analysed by FTIR and luminescence spectra. The surface morphology and the roughness of the metal surface have been analysed by atomic force microscopy. The protective film consists of Fe2+ - SG complex and Zn(OH)2. It is found to be UV - fluorescent. Source


Johnsirani V.,GTN Arts College | Sathiyabama J.,GTN Arts College | Rajendran S.,GTN Arts College | Lydia Christy S.M.,VSB Engineering College | Jeyasundari J.,SVN College
Portugaliae Electrochimica Acta | Year: 2013

The inhibition efficiency [IE] of an aqueous extract of eclipta alba leaves in controlling corrosion of carbon steel in sea water [Thondi, Tamil Nadu, India] has been evaluated by weight loss method. The weight loss study reveals that the formulation consisting of 6 mL of EAE (Eclipta Alba extract) and 25 ppm of Zn2+ has 92% inhibition efficiency in controlling corrosion of carbon steel in sea water. Polarization study reveals that EAE and Zn2+ system functions as a mixed type inhibitor. 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 AFM analysis. Source


Sathiyabama J.,Corrosion Research Center | Rajendran S.,Corrosion Research Center | Jeyasundari J.,SVN College | Shyamaladevi B.,Vivekananda Institute of Engineering and Technology for Women
Journal of Engineering Science and Technology Review | Year: 2010

The inhibition efficiency of phenolphthalein in controlling corrosion of carbon steel immersed in well water has been evaluated by mass loss method both in absence and presence of zinc ion. A synergistic effect exists between phenolphthalein (PN) and Zn 2+. The inhibition efficiency (IE) of the PN - Zn 2+ system decreases with increase in immersion period. Addition of N-Cetyl-N, N, N-Trimethylammlonium bromide (CTAB) sodium dodecyl sulphate (SDS), sodium sulphite (Na 2SO 3) does not change the excellent inhibition efficiency of the PN-Zn 2+ system. Polarization study suggests that the Pn-Zn 2+ system functions as a mixed inhibitor system. AC impedance spectra reveal the presence of a protective film on the metal surface. FTIR spectra indicate that the protective film consists of Fe 2+-PN complex and Zn(OH)2. © 2010 Kavala Institute of Technology. Source

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