J. Arockia Selvi,1 Susai Rajendran,1,* V. Ganga Sri,1 A. John Amalraj,2 B. Narayanasamy3
1Corrosion Research Centre, Department of Chemistry GTN Arts College, Dindigul – 624 005 - Tamil Nadu, India
2Department of Chemistry, Loyola College, Chennai, Tamil Nadu, India
3Department of Chemistry, Thiagarajar College of Engineering, Madurai, Tamil Nadu, India
Received 28 June 2008; accepted 30 September 2008
]]> Abstract
The inhibition efficiency (IE) of an aqueous extract of beet root (BR) in controlling corrosion of carbon steel in well water in the absence and presence of Zn2+ has been evaluated by mass loss method. The formulation consisting of 4 mL of BR extract and 50 ppm Zn2+ offers 98% inhibition efficiency to carbon steel immersed in well water. A synergistic effect exists between BR extract and Zn2+. Addition of N-Cetyl-N,N,N – trimethylammonium bromide (CTAB) does not change the excellent inhibition efficiency of the BR – Zn2+ system. The BR – Zn2+ system shows excellent IE up to 7 days. Polarization study reveals that this formulation controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe2+ - betanin complex and Zn(OH)2. The film is found to be UV - fluorescent.
Keywords: carbon steel, corrosion inhibition, plant extract, beet root, beta vulgaris.
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References
]]>1. S. Rajendran, S. Vaibhavi, N. Anthony and D.C. Trivedi, Corrosion 59 (2003) 529. [ Links ]
2. S. Rajendran, A. John Amalraj, M. Jasmine Joice, Noreen Anthony, D.C. Trivedi and M. Sundaravadiveelu, Corrosion Reviews 22 (2004) 233. [ Links ]
3. L.R. Chauhan, G. Gunesekaran, Corros. Sci. 49 (2007) 1143. [ Links ]
4. A.M. Abdel-Gaber, B.A. Abd-El-Nabey, I.M. Sidahmed, A.M. El-Zayaday, M. Saadawy, Corros. Sci. 48 (2006) 2765. [ Links ]
5. S. Rajendran, V. Ganga Sri, J. Arockia Selvi, A.J. Amalraj, Bull. Electrochem. 21 (2005) 367. [ Links ]
6. A. Minhaj, P.A. Saini, M.A. Quaraishi, Corros. Preven. Contr. 46 (1999) 32. [ Links ]
7. M. Kliskic, J. Rado Sevic, S. Gudic and V. Katalinic, J. Applied Electrochem. 30 (2000) 823. [ Links ]
8. G. Gunasekaran and L.R. Chauhan, Electrochimica Acta 49 (2004) 4387. [ Links ]
9. A.Y.E. Etre, M. Abdullah, Z.E.E. Tantawy, Corros. Sci. 47 (2005) 385. [ Links ]
10. A. Chetouani, B. Hammouti, Bull. Electrochem. 19 (2003) 23. [ Links ]
11. S. Rajendran, S. Shanmugapriya, T. Rajalakshmi, A. John Amalraj, Corrosion 61 (2005) 685. [ Links ]
12. S. Rajendran, S. Muthulakshmi, R. Rajeshwari, A. Vijitha, J. Electrochem. Soc. 54 (2005) 50. [ Links ]
13. G.O. Avwiri, F.O. Igho, Mater. Lett. 57 (2003) 3705. [ Links ]
14. P.C. Okafor, E.E. Ebenso, Pig. Resin. Tech. 36 (2007) 134. [ Links ]
15. E.E. Oguzie, Pig. Resin. Tech. 35 (2006) 334. [ Links ]
16. K. Anuradha, R. Vimala, B. Narayanasamy, J. Arockia Selvi, S. Rajendran, Chem. Eng. Comm. 195 (2008) 352. [ Links ]
17. G. Wranglen, Introduction to Corrosion and Protection of Metals (London, U.K: Chapman and Hall, 1985) 236.
18. S. Rajendran, B.V. Apparao and N. Palaniswamy, Bulletin of Electrochemistry 13 (1997) 441. [ Links ]
19. T.J. Mabry, H. Wyler, G. Sassu, M. Mercieer, J. Parish and A.S. Dreiding, Helv. Chim. Acta 45 (1962) 640. [ Links ]
20. R.M. Silverstein, G.C. Bassler, T.C. Morrill, Spectrometric Identification of Organic Compounds, John Wiley & Sons, New York, 1986. p. 95.
]]>21. Y. Sekine Hirakawa, Corrosion 42 (1986) 272. [ Links ]
22. A.J. Amalraj, M.S. Vadivelu, A.P.P. Regis, S. Rajendran, Bull. Electrochem. 17, 4 (2001) 179. [ Links ]
* Corresponding author. E-mail address: srmjoany@sify.com
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