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Abstract

Stress corrosion cracking (SCC) and corrosion behaviour of Al-Zn-Mg alloys have been studied in deaerated 3·5 wt-%NaCl solution at pH 3·5 with and without the hydrogen recombination poisons (HRPs) Na₂S.9H₂O or Ca₃P₂. SCC tests were carried out in the range of applied potential from −2150 to −400 mV(SHE) using constant load apparatus equipped with a linear variable differential transformer. The stress corrosion (SC) crack initiation and propagation periods were differentiated by measuring the extension of the gauge length with time. When the NaCl solution contained HRP the anodic dissolution rate decreased, probably due to the adsorption of hydride and/or its reduced phase, and the hydrogen reduction rate decreased due to the inhibition of hydrogen recombination. SC crack initiation and propagation times decreased with increasing HRP concentration, probably due to enhanced hydrogen permeation into the crack tip region. Incipient SCC was initiated preferentially at matrix/intermetallic inclusion interfaces. The results support the view that SC crack initiation and propagation in Al-Zn-Mg alloys are caused by hydrogen embrittlement.

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References

Gest

R. J.

and Troiano

A. R.

: Corrosion, 1974, 30, 274.

King

H. P.

and Pyun

S. I.

: J. Korean Inst. Met., 1984, 22, 621.

Gruhl

and Brungs

: Metall, 1969, 23, 1020.

Montgrain

and Swann

P. R.

: in ‘Hydrogen in metals’, Proc. Int. Conf. on ‘Effects of hydrogen on materials properties and selection and structural design’, Champion, PA, September 1973, (ed. Bernstein

I. M.

et al.), 575; 1974, Metals Park, OH, ASM.

Scamans

G. M.

, Alani

, and SWANN

P. R.

: Corros. SCi., 1976, 16, 443.

Scamans

G. M.

: Proc. 3rd Int. Conf. on ‘Effect of hydrogen on behavior of materials’, Moran, WY, (ed. Bernstein

I. M.

et al.), 467; 1981, Warrendale, PA, AIME.

Swanson

R. E.

, Thompson

A. W.

, BERNSTEIN

I. M.

, and MALONEY

J. L.

, in: Proc. 3rd Int. Conf. on ‘Effect of hydrogen on behavior of materials’, Moran, WY, (ed. Bernstein

I. M.

et al.), 459; 1981, Warrendale, PA, AIME.

Pyun

S. I.

, Suh

T. S.

, and KIM

H. P.

: Werkst. Korros., 1987, 38, 129.

Robertson

W. D.

and Tetelman

A. S.

: in ‘Strengthening mecha-nisms in solids’, 217; 1962, Metals Park, OH, ASM.

10.

Troiano

R. A.

: Trans. ASM, 1960, 52, 54.

11.

Parkins

R. N.

, Craig

I. H.

, and CONGLETON

: Corros. Sci., 1984, 24, 709.

12.

Gerberich

W. W.

and Wood

W. E.

: Metal/. Trans., 1974, 5, 1295.

13.

Millenbach

and GivoN

: Corrosion, 1983, 39, 13.

14.

McCRIGHT

R. D.

: in ‘Stress corrosion cracking and hydrogen embrittlement of iron base alloys’, Unieux-Firminy, June 1973, (ed. Hochmann

et al.), 306; 1977, Houston, TX, NACE.

15.

Newman

J. F.

and Shreir

L. L.

: Corros. Sci., 1969, 9, 631.

16.

Speidel

M. O.

and Hyatt

H. V.

: in ‘Advances in corrosion science and technology’, Vol. 2, 115; 1972, New York, Plenum.

17.

Holl

H. A.

and Johnstone

S. T. M.

: J. Aust. Inst. Met., 1969, 14, 262.

18.

Helfrich

W. J.

: Corrosion, 1968, 24, 423.

19.

Panthania

R. S.

and Tromans

: Metall. Trans., 1981, 12A, 607.

20.

Oriani

R. A.

: Ber. Bunsen-Gesellschaft Phys. Chem., 1972, 76, 848.

21.

Oriani

R. A.

and Josephic

P. H.

: Acta. Metall., 1974, 22, 1065.

22.

Albrecht

, Thompson

A. W.

, and BERNSTEIN

I. M.

: Metall. Trans., 1979, 10A, 1759.

Effects of hydrogen recombination poisons on stress corrosion crack initiation and propagation in Al-Zn-Mg alloys

Abstract

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