Sage Journals: Discover world-class research

Abstract

The inhibiting effect of 5-hydroxyindole (HI) and 5-nitroindole (NI) on mild steel corrosion in 0·5M sulphuric acid is reported in comparison with that of indole (IN). In the temperature range 25-55°C the inhibiting effect of HI and NI (as IN) is generally more pronounced on the anodic rather than on the cathodic process. HI and NI did not substantially affect the corrosion reaction mechanism. The corrosion rates decreased as inhibitor concentration increased, but as the temperature increased higher corrosion rates resulted. At 25, 35, 45, and 55°C the adsorption of NI and IN follows Frumkin's isotherm, while that of HI followed that of Temkin. The best inhibiting effect was obtained at the highest concentrations (0·005-0·0075M) of IN (inhibition percentage (IP) = 97%) and HI (IP = 60%) up to 25-35°C, while NI does not significantly act as a corrosion inhibitor.

Get full access to this article

View all access options for this article.

References

Schmitt

: Br. Corros. J., 1984, 19, 165–176.

Trabanelle

in ‘Chemical Industries’, Vol. 28, ‘Corrosion Mechanisms’, (ed. Mansfeld

), 120; 1987, New York, Marcel Dekker.

Schweinsberg

D. P.

, George

G. A.

, NANAYAKKARA

A. K.

, and STEINERT

D. A.

: Corros. Sci., 1988, 28, 33.

Moretti

, Quartarone

, TASSAN

, and ZINGALES

: Proc. Symp on ‘Organic compounds containing N, 0, S. and Se’, Venice, Italy, 1992, 81; 1992, Venice, II Cardo.

Moretti

, Quartarone

, TASSAN

, and ZINGALES

: Werkst. Korros., 1994, 45, (12), 5–11.

Hoar

T. P.

and Khera

R. P.

: Proc. 1st European Symp. on Corrosion Inhibitors, Ferrara, Italy, 1960, University of Ferrara, 73.

Zucchi

, Zucchini

, and TRABANELLI

Proc. 3rd European Symp. on Corrosion Inhibitors, Ferrara, Italy, 1970, University of Ferrara, 121–134.

O&apos

; Bockris

and Srinivasan

: Electrochim. Acta, 1964, 9, 31.

O&apos

; Bockris

and Reddy

A. K. N.

: in ‘Modern electrochemis-try’, Third Printing, Vol. 2, 1007; 1972, New York, Plenum Press.

10.

Vaidyanathan

and Hackerman

: Corros. Sri., 1971, 11, 737.

11.

Riggs

O. L.

Jr , and Hurd

R. M.

: Corrosion, 1967, 23, 252.

12.

Tourillon

and Garnier

:Electroanal. Chem., 1982, 135, 173–178.

13.

Waltman

R. J.

, Diaz

A. F.

, and BARGON

: J. Phys. Chem., 1984, 88, 4343–4346.

14.

Bukowska

and Jackowska

: J. Electroanal. Chem., 1992, 322, 347–356.

15.

RiGGS

O. L.

Jr ,: in ‘Corrosion Inhibitors’, (ed. Nathan

C. C.

), 7; 1973, Houston, TX, NACE.

16.

Damaskin

B. B.

, Petrii

O, A.

, and BATRAKOV

V. V.

: in ‘Adsorption of Organic Compounds on Electrodes’, 1971, New York, Plenum Press.

17.

O&apos

; Bockris

and Khan

S. U. M.

: in ‘Surface electrochemistry: a molecular level approach’, 582; 1993, New York and London, Plenum Press.

18.

Dhar

H. P.

, Conway

B. E.

, and JOSHE

K. M.

Electrochim. Acta, 1973, 18, 789.

19.

Fischer

: Proc. 1st European Symp. on Corrosion Inhibitors, Ferrara, Italy, 1960, University of Ferrara, Suppl. no. 3.

20.

Kamis

: Corrosion, 1990, 46, 478.

21.

Frumkin

A. N.

and Damaskin

B. B.

: in ‘Modem aspects of electrochemistry’, (ed. Bockris

J. O'M.

and Conway

B. E.

), Vol. 3, 158; 1964, London, Butterworths.

22.

Kamis

, Bellucci

, LATANISION

R. M.

, and EL-ASHRY

E. S. H.

: Corrosion, 1991, 47, 677.

23.

Donahue

and Nobe

: J. Electrochem. Soc., 1965, 112, 886.

24.

Blongren

and BOCKRIS

J.O'M.

: J. Phys. Chem., 1959, 63, 1475.

25.

Perkins

R. S.

and Andersen

T. N.

: in ‘Modern aspects of electrochemistry’, (ed. Bockris

J. O'M.

and Conway

B. E.

), Vol. 5, Ch. 3, 255; 1969, London, Butterworths.

26.

Thomas

J. M.

and THOMAS

W.J.

: in ‘Introduction to the principles of heterogeneous catalysis’, 5th edn, 14–18; 1981, London, Academic Press.

27.

Rangarajan

S. K.

: J. Electroanal. Chem., 1977, 82, 93.

28.

O&apos

, Bockris

and Swinicels

D. A. J.

: J. Electrochem. Soc., 1964, 111, 736.

29.

Ateya

B. G.

, EL-ANADOULI

B. E.

, and EL-NIZAMY

F. M.

: C0170S. SC., 1984, 24, (6), 509–515.

Some derivatives of indole as mild steel corrosion inhibitors in 0·5M sulphuric acid

Abstract

Get full access to this article

References