Stability of the Oxide Film on Metals in Relation to Inhibition of Corrosion. I. Mild Steel in Presence of Aggressive Anions

Abstract

The initial steady-state electrode potential of mild steel in a vigorously aerated salt solution is believed to be a type of potential not previously described in that, for a given type of surface preparation of metal, it is wholly controlled by the nature and concentration of the anions in solution. It is a function of the area of breakdown of the oxide film on the metal surface; it is dynamically maintained and is not primarily determined by thermodynamic considerations. The quantitative relationships between the concentration of salt, the steady-state potential of ths steel and the associated corrosion rate have been investigated and explained. The measurement of such potentials provides a very simple method of assessing the relative effect of different anions on the stability of the oxide film.

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References

Heyn

, & Bauer

, Mitt. K. Mater PrüfAmt Bed.-Dahlem, 1908, 26, 74

Brasher

D. M.

, Nature, Lond., 1962, 193, 868

Brasher

D. M.

, & Nurse

J., I appl. Chem., Lond., 1959, 9, 96

Rep. nat. chem. Lab., (1962), 1963, p. 75

Pourbaix

, ‘Atlas d'Équilibres Electrochimiques’, 1963, p. 307 (Paris Gauthier-Villars et Cie)

Evans

U. R.

, J. chem. Soc., 1929, p. 111 (especially p. 123)

Lorking

K. F.

, & Mayne

J. E. O.

, J. appl. Chem., Lond., 1960, 10, 262

Evans

U. R.

, J. chem. Soc., 1929, p. 111 (especially p. 117)

Evans

U. R.

, & Mears

R. B.

, Proc. R. Soc. (A.), 1934, 146, 153 (especially p. 164); Trans. Faraday Soc., 1935, 31, 527 (especially p. 530)

10.

Britton

S. C.

, & Evans

U. R.

, J. chem. Soc., 1930, p. 1781

11.

Evans

U. R.

, ‘Corrosion and Oxidation of Metals’, 1960, p. 238 (London: Edward Arnold)

12.

Hancock

, & Mayne

J E. O.

., J. appl. Chem., Lond., 1959, 9, 345

13.

Endo

, Sci. Rep. Tokyo Univ., 1928, p. 1111

14.

Friend

J. A. N.

, & Marshall

C. W.

, Trans. chem. Soc., 1914, 105, 2776

15.

Mears

R. B.

, & Evans

U. R.

, Trans. Faraday Soc., 1935, 31, 534

16.

Evans

U. R.

, J. Soc. chem. Ind., Lond., 1924, 43, 315T

17.

Evans

U. R.

, ‘Corrosion and Oxidation of Metals’, 1960, p. 103 (London: Edward Arnold)

18.

Rep. Chem. Res. Bd Dec.1937, 1938, p. 17

19.

Wormwell

, & Ison

H C. K.

., Chemy Ind., 1951, p. 293

20.

Brasher

D. M.

, Nature, Lond., 1960, 185, 838

21.

Brasher

D. M.

, 1st Int. Congr. Metallic Corrosion, London, 1961, 1962, p. 156 (London: Butterworths)

22.

Mercer

A. D.

, Rep. nat. chem. Lab., (1961), 1962, p. 56 and unpublished results

23.

Rep. nat. chem. Lab.1961, 1962, p. 54; Brasher, D. M., Beynon, J. G., Mercer, A. D., & Rhoades-Brown, J. E., Proc. 2nd Eur. Symp. Corrosion Inhibitors, Ferrara, 1965, 1966, p. 559 (Univ. of Ferrara)

24.

Rep. nat. phys. Lab.1965, 1966, p. 182

25.

Lepin

, & Kadek

, Dokl. Akad. Nauk SSSR, 1964, 155, (4), 839(R), 310 (E. transl.)

26.

Khairy

E. M.

, & Hussein

M. K.

, Corrosion, 1957, 13, 793t

27.

Wormwell

, & Brasher

D M.

., J. Iron Steel Inst., 1951, 169, 228

28.

Pryor

M. J.

, & Keir

D. S.

, J. electrochem. Soc., 1955, 102, 605

29.

Akimov

G. W.

, Corrosion, 1955, 11, 515t