Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Using Polyethylene Glycol Methyl Ether (PEGME)

A.K. Dubey^a* and G. Singh^b

^a Polymer and Soft Material Section (PSMS), National Physical Laboratory (NPL),

Dr. K.S. Krishnan Marg, New Delhi-110012, India

^b Corrosion Research Laboratory, Department of Chemistry, University of Delhi-110007, India

 

Received 12 January 2006; accepted 30 June 2006

 

Abstract

The corrosion inhibition of mild steel in one normal sulphuric acid solution by PEGME has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic) techniques. The results were supplemented with scanning electron microscopy and infra-red spectroscopy. All the methods employed are in reasonable agreement. There is no particular relationship of inhibition with concentration and temperatures. The thermodynamic functions of dissolution and adsorption processes were calculated from experimental polarization data and the interpretation of the results is given. Adsorption of PEGME was found to follow the Langmuir’s adsorption isotherm. PEGME is a mixed type of inhibitor.

Keywords: PEGME, corrosion inhibitors, mild steel, H₂SO₄, adsorption process, SEM, IR spectra

 

Texto disponível em PDF

Full text only in PDF format

 

References

1. S. Ramesh, S. Rajeswari, S. Maruthamuthu, Materials Letters 57 (2003) 4547.        [ Links ]

2. K.L. Vasanth, NACE, National Association of Corrosion Engineers, Paper# 233, Corrosion 96.

3. K.F. Khaled, Electrochimica Acta 48 (2003) 2493.

4. M.A. Quraishi, R. Sardar, Materials Chemistry and Physics 72 (2003) 425.

5. Hui-Long Wang, Hong-Bo Fan and Jia-Shen Zheng, Materials Chemistry and Physics 77 (2003) 655.

6. M.A. Migahed, Prog. In. Org. Coat. 54 (2005) 92.

7. J.M. Abd El-Kader, A.A. El-Warraky, A.M. Abd El-aziz, Br. Corros. J. 33(2) (1998) 139.

8. I.N. Putilova, S.A. Balezin and V.P. Barannik, Met. Corros. Inhibitors, p.31, Pergamm Press, N.Y. (1960)

9. D. Schweinsberg, G. George, A. Nanayakkara, D. Steiner, Corr. Sci. 28 (1988) 55.

10. A. Fouda, M. Moussa, P. Taha and E.L. Neanaa, Corr. Sci. 26 (1986) 719.

11. N. Hackerman, E. Snavely Jr. and J.S. Payne, J. Electrochem. Soc. 113 (1966) 651.

12. T. Murekewa, N. Hackerman, Corr. Sci. 4 (1987) 1051.

13. J.O’ M. Bockris and Drazic, Electrochim. Acta 7 (1962) 293.

14. G. Moretti, G. Quartarone, A. Tatsan and A. Zingales, Werkst. Korros. 45 (1994) 5.

15. M.A. Quraishi, J. Rawat and M. Ajmal, J. Appl. Electrochem. 30 (2000) 745.

16. H. Ashassi-Sorkhabi and S.A. Nabavi-Amri, Acta Chim. Slov. 47 (2000) 51.

 

* Corresponding author. E-mail address: dubey_delhi@rediffmail.com