Ethanol Extract of Phyllanthus Amarus as a Green Inhibitor for the Corrosion of Mild Steel in H₂SO₄

N. O. Eddy ^*

Department of Chemistry Ahmadu Bello University Zaria, Kaduna State, Nigeria

 

Received 23 February 2009; accepted 23 October 2009

 

Abstract

Inhibitive and adsorption properties of ethanol extract of Phyllanthus amarus for the corrosion of mild steel in H₂SO₄ were investigated using gravimetric, thermometric and gasometric methods. Ethanol extract of Phyllanthus amarus leaves is a good adsorption inhibitor for the corrosion of mild steel in H₂SO₄. Thermodynamic consideration indicates that the adsorption of the extract is exothermic and spontaneous. Also, the adsorption characteristic of the inhibitor is consistent with the assumptions of Langmuir adsorption isotherm. From the results and findings of the study, a physical adsorption mechanism is proposed for the adsorption of ethanol extract of Phyllanthus amarus on mild steel surface. The inhibition potentials of ethanol extract of Phyllanthus amarus leaves are enhanced by its phytochemical constituents.

Keywords: corrosion, inhibition, Phyllanthus amarus.

 

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References

1. N.O. Eddy, P. Ekwumemgbo and S.A. Odoemelam, Inter. Journal of Physical Sciences. 3(11) (2008) 1.

2. N.O. Eddy and S.A. Odoemelam, Inter. J. of Pure and Applied Chem. 3(4) (2008)1.

3. N.O. Eddy, S.A. Odoemelam and A.O. Odiongenyi, J. Appl. Electrochem. 39(6) (2009) 849 - 857.

4. N.O. Eddy, S.A. Odoemelam and N.W. Akpanudoh, J. Chem. Technol. 4 (2008) 1-10.

5. M. Abdallah, Corrosion Sc. 44 (2002) 717.

6. S. Acharya and S.N. Upadhyay, Trans. Indian Inst. Met. 57(3) (2004) 297.

7. E.E. Ebenso, Mater. Chem. Phys. 79 (2003) 58.

8. A.Y. El-Etre, M. Abdallah and Z.E. El-Tantawy, Corrosion Science 47(2) (2005) 385.

9. L. Anauda, R.A. Sathiyanathan, S.B. Maruthamuthu, M.C. Selvanayagam, S.B. Mohanan and N.B. Palaniswamy, Indian J. Chem. Tech. 12(3) (2005) 356.

10. N.O. Eddy and E.E. Ebenso, African J. Pure Applied Chem. 2(6) (2008) 1.

11. M.A. Bendahou, M.B.E. Benadellah and B.B. Hammouti, Pigment and Resin Technol.35 (2006) 95.

12. A. Bouyanzer and B. Hammouti, Pigment and Resin Tech. 33 (2004) 287.

13. A. Chetounani, B. Hammouti, and M. Benkaddour,Pigment and Resin Tech. 33 (2004) 26.

14. E.E. Ebenso, N.O. Eddy and A.O. Odiongenyi, Portugaliae Electrochimica Acta 27(1) (2009) 13.        [ Links ]

15. N.O. Eddy and A.S. Ekop, Asian J. Chem. 19(3) (2007) 1825.

16. A.O. Odiongenyi, S.A. Odoemelam and N.O. Eddy, Portugaliae Electrochimica Acta 17(1) (2009) 33.         [ Links ]

17. N.O. Eddy, Inhibition of corrosion of mild steel by some antibiotics, Ph.D Thesis, University of Calabar, (2007).

18. S.A. Odoemelam and N.O. Eddy, J. Surface Sci. Technol. 24(1-2) (2008) 1.

19. E.E. Ebenso and E.E. Oguzie, Mat. Letters 59 (2005) 2163.

20. N.O. Eddy, S.A. Odoemelam and A.J. Mbaba, Afri. J. Pure Applied Chem. 2(12) (2008) 132.

21. N.O. Eddy, U.J. Ibok, E.E. Ebenso, A.E. Nemr and E.H. El Ashry, J. Molecular Modeling. DOI 10.1007/s00894-009-0472-7 (2009)

 

^*Corresponding author. E-mail address: nabukeddy@yahoo.com