SciELO - Scientific Electronic Library Online

 
vol.22 número2Characterization of Plasticized PEO Based Solid Polymer Electrolyte by XRD and AC Impedance Methods índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Portugaliae Electrochimica Acta

versão impressa ISSN 0872-1904

Port. Electrochim. Acta v.22 n.2 Coimbra  2004

 

Guar Gum as Corrosion Inhibitor for Carbon Steel in Sulfuric Acid Solutions

 

M. Abdallah*

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

 

Received 31 May 2003; accepted in revised form 26 February 2004

 

Abstract

Guar gum was tested as corrosion inhibitor for carbon steel in 1 M H2SO4 solution using weight loss and Tafel polarization techniques. The results showed that the inhibition efficiency increases with the increasing of the guar gum concentration, which act as an inhibitor of the mixed type. The inhibition action of guar gum was discussed in terms of its horizontal adsorption on the metal surface. The adsorption follows Langmuir adsorption isotherm. The effect of the presence of chloride ion in pitting corrosion was analyzed by the potentiodynamic anodic polarization technique. The pitting corrosion potential changes with the concentration of Cl- ion according to a sigmoid S-shaped curve. This behaviour was explained on the basis of the formation of passivatable, active and continuously propagated pits.

 

Keywords: Guar gum, C-steel, corrosion inhibitor, pitting potential, adsorption.

 

 

Texto completo disponível em PDF

Full text only in PDF format

 

 

References

1. Trabanelli, Corrosion 47 (1991) 410.        [ Links ]

2. B.A. Abd El-Nabey, E. Khamis, M.Sh. Ramadan, A. El-Gindy, Corrosion 52-9 (1996) 671.        [ Links ]

3. S.S. Abd El-Rehim, S.A.M. Refay, F. Taha, M.B. Saleh, R.A. Ahmed, J. Appl. Electrochem. 31 (2001) 429.         [ Links ]

4. J.M. Bastidas, J.L. Polo, E. Cano, C.L. Torres, J. Material Sci. 35 (2000) 2637.         [ Links ]

5. S.S. Abd El-Rehim, M.A.M. Ibrahim, K.F. Khaled, J. Appl. Electrochem. 29 (1999) 593.        [ Links ]

6. F. Bentiss, M. Lagrenée, M. Traisnel, Corrosion 56-7 (2000) 733.        [ Links ]

7. J. de Damborenea, J.M. Bastidas, A.J. Vazquez, Electrochimica Acta 42-3 (1997) 455.        [ Links ]

8. J.G.N. Thomos, Proceedings of the 5th European Symposium on Corrosion Inhibitors, Ann Univ. Ferrara, Italy, N.S. Sez V, suppl. N.8 (1980) 453.        [ Links ]

9. P.B. Mathur, T.Vasudevam, Corrosion 38 (1982) 17.        [ Links ]

10. B.G. Ateya, B.E. Anadouli, F.M. El-Nizamy, Bull. Chem. Soc. Japan 54 (1981) 3157.         [ Links ]

11. S.M. Abd El-Haleem, A.A. AbdEl-Fattah, W. Tayor, Res. Mechanica 30-3 (1983) 353.         [ Links ]

12. M.S. Morad, J. Appl. Electrochem. 29 (1999) 619.        [ Links ]

13. M.Stren, Al-Geary, J. Electrochem Soc. 104 (1975) 56.        [ Links ]

14. B.G. Ateya, B.E. El-Anadouli, F.M. El-Nizamy, Corros. Sci. 24-6 (1984) 497.        [ Links ]

15. N.G. Thompson, B.C. Syretti, Corrosion 48 (1992) 649.         [ Links ]

16. Ja. M. Kolotyrkin, Corrosion 19 (1963) 261 t.         [ Links ]

17. T.P. Hoar, D. Mears, G. Rothwell, Corros. Sci. 5 (1965) 279.        [ Links ]

18. S.S. Abd El-Rehim, S.M. Abd El- Wahab, E.E. Fouad, Hamdy H. Hassan, Mater. Corros. 46 (1995) 633.         [ Links ]

19. S.M. Abd El-Haleem, Br. Corros. J. 14 (1979) 171.         [ Links ]

20. M.Abdallah, S.M. Abd El-Haleem, Bull. Electrochem. 12 (7-8) (1996) 449.         [ Links ]

21. S.M. Abd El-Haleem, S.S. Abd El-Rehim, A.M. Azzam, Werkstoffe U.Korros. 27 (1976) 630.        [ Links ]

 

*E-mail address: metwally552@hotmail.com

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