SciELO - Scientific Electronic Library Online

vol.24 número3Corrosion inhibition of copper in 1 M HNO3 solution by N-phenyl Oxalic Dihydrazide and Oxalic N-phenylhydrazide N’-phenylthiosemicarbazideA form of adsorptive pre-wave in a sampled dc polarography on a static mercury drop electrode índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




Links relacionados

  • Não possue artigos similaresSimilares em SciELO


Portugaliae Electrochimica Acta

versão impressa ISSN 0872-1904

Port. Electrochim. Acta v.24 n.3 Coimbra  2006


Inhibition of metallic corrosion using ficus extract

A.Y. El-Etre,* Z. El-Tantawy

Chemistry Department, Faculty of Science, Benha University, Benha, Egypt




The inhibitive action of the extract of Ficus nitida leaves toward general and pitting corrosion of C-steel, nickel and zinc in different aqueous media was investigated. Weight loss measurements, potentiostatic and potentiodynamic polarization techniques were used in this study. It was found that the presence of ficus extract in the corrosive media (acidic, neutral or alkaline) decreases the corrosion rates of the three tested metals. The inhibition efficiency increases as the extract concentration is increased. The inhibition efficiency depends on the type of corroded metal and on the corrosive solution. It was also found that the presence of ficus extract in the chloride containing solution shifts the pitting potentials of the tested metals toward the noble direction. The inhibitive action of ficus extract is discussed in view of adsorption of its components, the poly aromatic compounds, friedelin, epifriedelanol and nitidol, on the metal surface. It was found that such adsorption follows Langmuir adsorption isotherm. The calculated values of the free energy of adsorption indicated that the adsorption process is spontaneous.

Keywords: C-steel, nickel, zinc, corrosion inhibition, natural products, ficus.


Texto disponível em PDF

Full text only in PDF format



1. Ling-Guang Qiu, An-Jian Xie and Yu-Hua Shen, Corros. Sci. 47 (2005) 273.        [ Links ]

2.  K. Sapre, S. Seal, P. Jepson, H.B. Wang, Z. Rahman and T. Smith, Corros. Sci. 45 (2003) 59.

3.  F. Zucchi, G. Trabanelli, C. Monticelli and V. Grassi, Corros. Sci. 42 (2000) 505.

4.  Rong Guo, Tianqing Liu and Xun Wei, Colloids Surf. 209 (2002) 37.

5.  M.R. Laamari, A. Derja, J. Benzakour and M. Berraho, J. Electroanal. Chem. 569 (2004) 1.

6. E.E. Foad El-Sherbini, S.M. Abdel Wahaab and M. Deyab, Mater. Chem. Phys. 89 (2005) 183.

7.  M.A. Pech-Canul and P. Bartolo-Pérez, Surf. Coat. Tech. 184 (2004) 133.

8. M. Abdallah, Corros. Sci. 45 (2003) 2705.

9. A.Y. El-Etre, M. Abdallah and Z.E. El-Tantawy, Corros. Sci. 47 (2005) 385.

10. A.Y. El-Etre and M. Abdallah, Corros. Sci. 42 (2000) 731.

11. A.Y. El-Etre, Corros. Sci. 45 (2003) 2485.

12. A.Y. El-Etre, Corros. Sci. 40 (1998) 1845.

13. R.M. Saleh, A.A. Ismail and A.A. El-Hosary, Br. Corros. J. 17 (1982) 131.

14. S.A. Verma and G.N. Mehta, Bull. Electrochem. 15 (1999) 67.

15. S. Martinez and I. Stagljar, J. Molecular Structure 640 (2003) 167.

16. M.A. Quraishi, I.H. Farooqi and P.A. Saini, Corrosion 55 (1999) 493.

17. I.O’M. Bockris and D.A. Swinkls, J. Electrochem. Soc. 111 (1964) 736.

18. M.H.A. Elgamal, B.A.H. El-Tawil and M.B.E. Fayez, Naturwissenschaften 62 (1975) 486.

19. M. Behari, K.U. Rani, T. Matsumoto and N. Shimizu, Curr. Agric. 8 (1984) 73.


*Corresponding author. E-mail address:



Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons