Sage Journals: Discover world-class research

Abstract

A study was made of the corrosion behaviour in sea water of a metal matrix composite (MMC) of Al–Si alloy reinforced with SiC particles. Free corrosion and electrochemical tests were carried out at 25°C in quiescent sea water at pH 8·2 containing 6·5 ppm dissolved oxygen. The microstructure was examined by metallographic microscopy and by X-ray microdiffractometry; electrochemical properties (pitting resistance, polarisation resistance) were investigated by potentiodynamic polarisation and electrochemical impedance spec troscopy; pitting formation was observed by optical microscopy; and the corrosion layer was characterised by X-ray photoelectron spectroscopy. In sea water the MMC suffered localised corrosion of the metallic matrix where Al–Cu intermetallic compounds are present. Pit formation was enhanced by copper enrichment in the surface layer. The MMC showed a small passivity domain which increased slowly with immersion time. No domain of perfect passivity was present. The SiC particles acted as cathodic sites with respect to the metallic matrix, which experienced selective aluminium dissolution.

Get full access to this article

View all access options for this article.

References

Placiej

R. C.

and AGARWALA

V. S.

: Corrosion, 1988, 44, 680.

England

and HALL

I. W.

: Scr. Metall., 1986, 20, 697.

Pickering

H. W.

: Corros. Sci., 1989, 29, 325.

McINTYRE

J. F.

, Conrad

R. K.

, and GOLLEDGE

S. L.

: Corrosion, 1990, 46, 902.

Pohlman

S. L.

: Corrosion, 1978, 34, 156.

Hihara

L. H.

and LATANISION

R. M.

: Corrosion, 1992, 48, 546.

Brown

: Mater. World, 1993, 1, 20.

Bhat

M. S. N.

, SURAPPA

M. K.

, and SUDHAKER NAYAK

H. V.

: J. Mater. Sci., 1991, 26, 4991.

Trazaskoma

P. P.

, McCAFERTY

E. M.

, and CROVE

C. R.

: J. Electrochem. Soc., 1983, 130, 1804.

10.

Sun

, KOO

E. Y.

, and WHEAT

H. G.

: Corrosion, 1991, 47, 741.

11.

Trazaskoma

P. P.

: Corrosion, 1990, 46, 402.

12.

Nunes

P. R. C.

and RAMANATHAN

L. V.

: Corrosion, 1995, 51, 610.

13.

Deuis

R. L.

, GREEN

, SUBRAMANIAN

, and YELLUP

J. M.

: Corrosion, 1997, 53, 880.

14.

Patton

A. M.

: J. Inst. Met., 1972, 100, 197.

15.

Perkins

, CUMMINGS

J. R.

, and GRAHAM

K. J.

: J. Electrochem. Soc., 1982, 129, 137.

16.

Bogar

F. D.

and FOLEY

R. T.

: J. Electrochem. Soc., 1974, 119, 462.

17.

Gimenez

, RAMEAU

J. J.

, and REBOUL

M. C.

: Corrosion, 1982, 37, 673.

18.

Kochler

E. L.

and EVANS

: J. Electrochem. Soc., 1964, 111, 17.

19.

Dallek

and FOLEY

R. T.

: J. Electrochem. Soc., 1976, 123, 1775.

20.

Foroulis

Z. A.

and THUBRIKAR

M. J.

: J. Electrochem. Soc., 1975, 122, 1296.

21.

Traverso

, GNECCO

, and BECCARIA

A. M.

: Proc. 3rd Nat! Conf. PFT2, Taormina, Italy, November 1997, CNR.

22.

Beccaria

A. M.

and TRAVERSO

: Proc. ECASIA ‘97: 7th European Conf. on ‘Application of surface and interface analysis’, (ed. Olefjord

et al.); 1998, Chichester, Wiley.

23.

Castle

J. C.

and PARVIZI

M. S.

: Corros. Prey. Control, 1986, 35, 5.

24.

Eppler

D. C.

and CASTLE

J. C.

: Corrosion, 1979, 35, 451.

25.

Metikos-Hukovic

and ZEVNIK

: Werkst. Korros., 1982, 33, 661.

26.

Beccaria

A. M.

, MOR

E. D.

, and POGGI

: Werkst. KOITOS., 1983, 34, 236.

27.

Szklarska-Smialowska

: ‘Pitting corrosion of metals’, 221; 1986, Houston, TX, NACE.

28.

Juttner

, LORENZ

W. J.

, KENDING

M. W.

, and MANSFELD

: J. Electrochem. Soc., 1988, 135, 335.

29.

Juttner

, MANANDHAR

, SEIFER-KRAUS

, LORENZ

W. J.

, and SCHMIDT

: Werkst. Korros., 1986, 37, 377.

30.

Titz

, WAGNER

G. H.

, SPAHN

, EBERT

, JUTTNER

, and LORENZ

W. J.

: Corrosion, 1990, 46, 221.

31.

Mansfeld

, LIN

, KIM

, and SHIH

: Corrosion, 1989, 45, 615.

32.

Shill

and MANSFELD

: Corrosion, 1989, 45, 610.

33.

Gill

and KURZ

: Acta Metall. Mater., 1995, 43, 139.

34.

Lloyd

D. J.

and JIN

: Metall. Trans. A, 1988, 19, 3107.

35.

Lloyd

D. J. A.

: Compos. Sci. Technol., 1989, 35, 159.

36.

Trowsdale

A. J.

, NOBLE

, HARRIS

S. J.

, GIBBINS

I. S. R.

, THOMPSON

G. E.

, and WOOD

G. C.

: Corros. Sci., 1996, 38, 177.

37.

Nylund

and OLEFJORD

: Surf. Interface Anal., 1994, 21, 283.

38.

Briggs

and SEAH

M. P.

: ‘Practical surface analysis’, 485; 1985, Chichester, John Wiley and Sons.

39.

Arezzo

, GIMONDO

, and ZACCHETTI

: Proc. Conf. on ‘Materiali. Ricerca e prospettive tecnologiche alle sogli del 2000’, Milan, November 1997, Federazione delle Associazione Scientifiche e Techniche.

Corrosion behaviour fo Al–Si/SiC composite in sea water

Abstract

Get full access to this article

References