E.E. Ebenso,1,* N.O. Eddy,2 A.O. Odiongenyi3
1Department of Chemistry and Chemical Technology, National University of Lesotho, P.O.Roma 180, Lesotho, Southern Africa
2Department of Chemistry, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
3 Department of Chemistry, Michael Okpara University, Umudike, Nigeria
Received 28 August 2008; accepted 16 September 2008
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Abstract
The corrosion inhibition of mild steel in H2SO4 in the presence of methocarbamol was studied using thermometric and gasometric (hydrogen evolution) methods. The study revealed that the corrosion rate increases with temperature, time and concentration of H2SO4. Addition of methocarbamol to the corrodent solution lowered the corrosion rate of mild steel. Inhibition efficiency (%I) of methocarbamol was found to increase with concentration and decreased with temperature. Adsorption of methocarbamol molecule on mild steel surface was found to obey the Langmuir adsorption isotherm. The phenomenon of physical adsorption is proposed from the obtained thermodynamic parameters.
Keywords: corrosion inhibition, mild steel, adsorption, methocarbamol.
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1. M.A. Ameer, E. Khamis, G. Al-Senani, Ads. Sci. Tech.18 (2000) 177. [ Links ]
2. M. Kissi, M. Bouklah, B. Hammouti, M. Benkaddour, Appl. Surf. Sci. 252 (2006) 4190. [ Links ]
3. E.E. Ebenso, Bull. Electrochem. 19 (2003) 209. [ Links ]
4. E.E. Ebenso and E.E. Oguzie, Mater. Lett. 59 (2005) 2163. [ Links ]
5. E.E. Oguzie, G.N. Onuaha and A.I. Onuchukwu, Mater. Chem. Phys.89 (2004) 305. [ Links ]
6. E.E. Oguzie, Mater. Lett. 59 (2005) 1076. [ Links ]
7. L. Tang, X. Li, G. Mu, G. Liu, L. Li, H. Liu and Y. Si, J. Mater. Sci. 41(2006) 3063. [ Links ]
8. D.Q. Zhang, L.X. Gao and G.D. Zhou, J. Appl. Electrochem., 33 (2003) 361. [ Links ]
9. Y. Harek and L. Larabi, Kem. Ind. 53(2) (2004) 55. [ Links ]
10. H.H. Uhlig, R.W. Revie, Corrosion and Control, John Wiley & Sons, New York, 1985. p. 263.
11. E.W. Flick , Corrosion Inhibitors, Park Ridge, New Jersey, 1987. p. 68.
12. B. Gomez, N.V. Likhanova, M.A. Dominguez Aguilar, O. Olivares, J.M. Hallen and J.M. Martinez-Magadan, J. Phys. Chem.A 109 (2005) 8950. [ Links ]
13. S.L. Granese, Corrosion 44 (1998) 322. [ Links ]
14. F. Bentiss, M. Traisnel and M. Lagrenee, J. Appl. Electrochem. 31 (2000) 41. [ Links ]
15. F. Bentiss, M. Lagrenee and M. Traisnel, Corros. Sci. 42 (2000) 127. [ Links ]
16. B. Hammouti, R. Salghi and S. Kertit, J. Electrochem. Soc. India 47 (1998) 31. [ Links ]
17. B. Mernari, H. Elattari, M. Traisnel, F. Bentiss and M. Langrene, Corros. Sci. 40 (1998) 391. [ Links ]
18. A. Chetouani et. al., Appl. Surf. Sci. 249 (2005) 384. [ Links ]
19. C. Capo, Corros. Sci.38 (1996) 2073. [ Links ]
20. S. Kertit, H. Essenffi, B. Hammouti and M.Benkaddour, J. Chem. Phys. 95 (1998) 2070. [ Links ]
21. C.W. Cumper, R. Gozes Kowiak and P. Newton, Corros. Sci.22 (1982) 551. [ Links ]
22. S. Kertit and B. Hammoutti, Appl. Surf. Sci. 3 (1996) 59. [ Links ]
23. A. Chetouanni, A. Aounti, B. Hammoutti, N. Benchat, T. Benhadda and S. Kertit, Corros. Sci. 45 (2003) 1675. [ Links ]
24. S.A. Abd and El- Maksoud, Corros. Sci. 44 (2002) 803. [ Links ]
25. M. Abdallah, Corros. Sci.44 (2002) 717. [ Links ]
26. M. Abdallah, Corros. Sci. 46 (2004) 1981. [ Links ]
27. M.M. El-Naggar, Corros. Sci. 49(5) (2007) 2226. [ Links ]
28. R. Solmaz, G. Kardas, B. Yazici and M. Erbil, Protection of Metals 41(6) (2005) 581. [ Links ]
29. W.T. Sing, C.L. Lee, S.L. Yeo, S.P. Lim and M.M. Sim, Bioorg. Med. Chem. Lett. 11 (2001) 91. [ Links ]
30. El-Dissouky, A.A. El-Bindary, A.Z. El-Soubati and A.S. Hilali, Spectrochim. Acta A57 (2001) 1163. [ Links ]
31. E.E. Oguzie, Pigments & Resin Technology 35 (2006) 334. [ Links ]
32. S.A. Umoren, E.E. Ebenso, P.C. Okafor and O. Ogbobe, Pigment & Resin Technology 35 (2006) 346. [ Links ]
33. D.S. Sheatty, P. Shetty, H.V.S. Nayak, J. Chilean Chem. Soc. 51 (2006) 849. [ Links ]
34. E.E. Ebenso, Mater. Chem. Phys. 79 (2003) 58. [ Links ]
35. E.E. Ebenso, Bull. Electrochem. 19 (2003) 209. [ Links ]
36. E.E. Ebenso, Bull. Electrochem. 20 (2004) 551. [ Links ]
37. A. Yurt, G. Bereket, A. Rivrak, A, Balaban, B. Erk, J. Appl. Electrochem. 35 (2005) 1025. [ Links ]
38. E.E. Ebenso, Mater. Chem. Phys. 79 (2003) 58. [ Links ]
39. S.A. Umoren, I.B. Obot, E.E. Ebenso, P.C. Okafor, O. Ogbobe and E.E. Oguzie, Anti-Corrosion Methods and Materials 53 (2006) 277. [ Links ]
40. H.M. Bhajiwala and R.T. Vashi, Bull. Electrochem. 17 (2001) 441. [ Links ]
41. S. Bilgic and M. Sahin, Mater. Chem. Phys. 70(2001) 290. [ Links ]
42. W.A. Badawy, K.M. Ismail and A.M. Fathi, Electrochimica Acta 51 (2006) 4182. [ Links ]
43. M.A. Migahed, H.M. Mohammed and A.M. Al-Sabagh, Mater. Chem. Phys. 80 (2003) 169. [ Links ]
44. A. Azim, L.A. Shalaby and H. Abbas, Corros. Sci. 14 (1974) 21. [ Links ]
* Corresponding author. E-mail address: eno_ebenso@yahoo.com, ee.ebenso@nul.ls
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