R.B. Rastogi, M. Yadav, K. Singh, M.M. Singh*

Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi - 221 005 (INDIA)

Received 13 March 2003; accepted in revised form 16 April 2004

Abstract

The inhibition of mild steel corrosion in 1N sulphuric acid was studied in the presence of various concentrations (10-150 ppm) of substituted dithiobiurets and their molybdenum and tungsten complexes at 25 ^°C. All the compounds behaved as ambiodic corrosion inhibitors for mild steel and were considered to inhibit the corrosion by getting adsorbed on the surface. The inhibition efficiencies (IEs) of the complexes, in general, were found to be appreciably higher than those of corresponding ligands. However, the IE values of the complexes of molybdenum and tungsten of the same ligand did not differ much in their magnitude indicating thereby that the nature of central metal ions hardly influenced the inhibition efficiency. The slight difference in the IEs of the complexes at a given concentration seems to be caused by the slight difference in their size. The variation in IEs of different derivatives of ligands has been attributed to change in their size, number of active sites for adsorption and the electron density on these active sites. Scanning Electron Microscopy was used to study the surface of corroded and inhibited specimens.

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References

1. J.L. Jha, G. Singh, Trans. SAEST 26(2-3) (1991) 158.        [ Links ]

2. R.K. Chaturvedi, R.S. Chaudhary, Anticorros. Methods & Mater. 41-05 (1994) 3.        [ Links ]

3. G. Moretti, G. Quartarone, A. Tassan, A. Zingales, Electrochim. Acta 41-13 (1996) 1971A.        [ Links ]

4. R.S. Chaudhary, S. Sharma, Trans. SAEST 32-4 (1997) 99.        [ Links ]

5. S. Sharma, R. Arora, R.S. Chaudhary, J. Electrochem. Soc. India 48-3 (1999) 283.        [ Links ]

6. E. Sherbini, Mater. Chem. Phys. 60-3 (1999) 286.        [ Links ]

7. Smita, A. Verma, G.N. Mehta, Trans. SAEST 32(2-3) (1997) 58.        [ Links ]

8. Smita, A. Verma, G.N. Mehta, Trans. SAEST 33(2-3) (1998) 60.        [ Links ]

9. M.M. Singh, R.B. Rastogi, B.N. Upadhyay, Corrosion 50 (1994) 620.        [ Links ]

10. M.M. Singh, R.B. Rastogi, B.N. Upadhyay, Bull. Electrochem. 12(1-2) (1996) 26.        [ Links ]

11. M.M. Singh, R.B. Rastogi, B.N. Upadhyay, M. Yadav, Indian J. Chem. Technol. 6 (1999) 93.        [ Links ]

12. R.B. Rastogi, M.M. Singh, M.Yadav, K. Singh, Indian J. Eng. Mater. Sci. 10 (2003) 155.        [ Links ]

13. R.B. Rastogi, M.M. Singh, M. Yadav , Bull. Electrochem. 20-1 (2004) 19.        [ Links ]

14. R. Singh, Chemistry of N & S Heterocyclic Compounds and Related Systems, Ph.D. Thesis, Banaras Hindu University, 1978.        [ Links ]

15. R.B. Rastogi, M.Yadav, K. Singh, Syn. Reac. Org. Met-Org. Chem. 31-6 (2001) 1011.        [ Links ]

16. C. Chakrabarty, M.M. Singh, C.V. Agarwal, British Corros. J. 18 (1983) 107.        [ Links ]

17. A. Kumar, S.K. Patnaik, M.M. Singh, Mater. Chem. Phys. 56 (1998) 245.        [ Links ]

18. C. Chakrabarty, M.M. Singh, C.V. Agarwal, Corrosion and Control 33-2 (1986) 72.        [ Links ]

19. A. Gupta, M.M. Singh, Port. Electrochim. Acta 17 (1999) 21.        [ Links ]

20. B.B. Damaski, A.O. Pictrij, W.W. Batrakov, Adsorpeja Organiczescich Sojedinienijna Electrodach Moskwa ,1968.        [ Links ]

21. E. Gileadi, Electrosorption, Plenum Press, New York, 1967.        [ Links ]

*Corresponding author. E-mail address: apchemhd@bhu.ac.in