Corrosion Inhibition of Electrodeposited Tellurium and Palladium in Nitric Acid Solution 

 

A.S. Fouda,* H.A. Mostafa, M.N. Moussa

 

Chemistry Department, Faculty of Science, El-Mansoura University,El-Mansoura-35516, Egypt

 

 

Abstract

Corrosion inhibition of 3-phenyl hydrazonoacetyl acetone derivatives on electrodeposited tellurium and palladium in nitric acid was measured by using electrochemical method. Polarization curves showed that these compounds are cathodic inhibitors. The inhibition appears to function through general adsorption following the Flory-Huggins adsorption isotherm. The rate of corrosion depends on the nature of the inhibitor and its concentration, mode of interaction with the metal surface, molecular size, formation of complexes and the active center in the molecules and its electron charge density. Also, ΔG^o_ads. values were calculated. The reaction rate was found to be proportional to the absolute value of the Hammett constant (s).

 

Keywords: tellurium, palladium, corrosion inhibition, phenyl hydrazonoacetyl acetone, nitric acid.

 

 

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References

1.      A. El-Sayed, J. Appl. Electrochem. 27 (1997) 193.

2.      G. Schmitt, Br. Corros. J. 19 (1984) 165.

3.      M.N. Moussa, F.I. Taha, M.M. Gouda and G.M. Singab, Corros. Sci. 16 (1976) 379.        [ Links ]

4.      A.O. Baglaff, S.A. Al-Hamood and M.N. Moussa, Corros. Sci.  (1980).        [ Links ]

5.      S.M. Hassan, M.N. Moussa, F.I. Taha and A.S. Fouda, Corros. Sci. 21 (1981) 439.        [ Links ]

6.      A.S. Fouda, M.N. Moussa and H.A. Mostafa, Korrosion (Dresden), 18(1) (1987) 28.        [ Links ]

7.      A.S. Fouda, M.N. Moussa, F.I. Taha and A.I. Elneanaa, Corros. Sci. 26 (1986) 719.        [ Links ]

8       A.S. Fouda, H.M. Abo El-Nader and M.N. Moussa, Acta Chimica Hung. 124(4) (1987) 581.        [ Links ]

9.      A.M. El-Baz, Ph.D. Thesis, Mansoura Univ., (1987), Egypt.        [ Links ]

10.    A.A. Fadda, M.M. Yousef, Y.M. Darwish and A.M. El-Housin, Ind. J. Texst. Res. 11 (1986) 44.        [ Links ]

11.    A.S. Fouda, H.A. Mostafa, M.N. Moussa and S.M. El-Masry, J. Radioanal. Nucl. Chem., Letters 118(1) (1987) 45.        [ Links ]

12.    S.M. El-Masry, Ph.D. Thesis, El-Mansoura Univ., Egypt (1988).        [ Links ]

13.    B.B. Damaskin "Adsorption of Organic Compounds on Electrodes" p. 221, 263, Plenum Press, N.Y. (1971).                        [ Links ]

14.    A.A. El-Awady, B.A. Abd El-Naby and S.G. Aziz, J. Electrochem. Soc. 139(8) (1992) 2149.        [ Links ]

15.    W.W. Damaskin and O.A. Pietrij, Elektrodach. Moskwa (1968).        [ Links ]

16.    L.P. Hammett, "Physical Organic Chemistry" P- 196, McGraw-Hill Book Co., N.Y. (1940).        [ Links ]

17.    A.K. Mohamed, Ph.D. Thesis, Mansoura University, Egypt (1986).        [ Links ]

18.     B.A. Abd El-Naby, A. El-Tokhy, M. El-Gamel and F. Mahgoob, Surf. Coat. Technol. 27(4) (1986) 325.        [ Links ]

 

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