Sage Journals: Discover world-class research

Abstract

This paper reports a study of the composition and morphology of the corrosion products formed on galvanised steel specimens exposed to a swimming pool atmosphere. Two thicknesses of hot dip zinc coatings were investigated measuring 1·8 and 180 µm, respectively. Specimens were analysed throughout a 12 month exposure period and a reaction sequence identified using the techniques of X-ray diffraction, X-ray photoelectron spectroscopy, and SEM/EDX. The main phases determined were: zincite (ZnO), simonkolleite (Zn₅(OH)₈Cl₂. H₂O), hydrated zinc hydroxychlorosulphate (Zn₄Cl₂(OH)₄SO₄. 5H₂O), and hydrated sodium zinc hydroxychlorosulphate (NaZn₄Cl(OH)₆SO₄. 6H₂O). Amarantite (FeSO₄(OH). 3H₂O) was found only on the specimens with the thinner zinc coating through which iron diffusion from the bulk steel could occur.

Get full access to this article

View all access options for this article.

References

Anderson

E. A.

: ‘The atmospheric corrosion of rolled zinc’, STP 175, 126; 1955, Philadelphia, PA, ASTM.

Biestek

and NIEMIEC

: Pr. Inst. Mech. Precyz., 1966, 14, 38.

Guttman

: ‘Effect of atmospheric factors on corrosion of rolled zinc’, STP 435, 223; 1968, Philadelphia, PA, ASTM.

Sinclair

J. D.

, POSTA-KELTY

L. A.

, and WESCHLER

C. J.

: Atmos. Environ., 1983, 19, 315.

Weschler

C. J.

, KELTY

S. P.

, and LINGOUSKY

J. E.

: J. Air. Pollut. Control Ass., 1983, 33, 624.

Sinclair

J. D.

: Anal. Chem., 1982, 54, 1529.

Grauer

and FEITKNECHT

: Corros. Sci., 1976, 7, 629.

Odnevall

: ‘Atmospheric corrosion of field exposed zinc’, PhD thesis, Royal Institute of Technology, Sweden, 1994.

Powder Diffraction Files, Set 1–36, International Centre for Diffraction Data, Swarthmore, 1986.

10.

Moulder

J. F.

, STICKLE

W. F.

, SOBOL

P. E.

, BOMBEN

K. D.

, and CHASTAIN

: ‘Handbook of X-ray photoelectron spectroscopy’; 1992, Norwalk, CT, Perkin-Elmer.

11.

Nowacki

and SILVERMAN

: Z. Kristallogr., 1961, 21, 115.

12.

Odnevall

and LEYGRAF

. J. Electrochem. Soc., 1991, 138, 1923.

13.

Odnevall

and WESTDAHL

: Corros. Sci., 1993, 34, 1231.

14.

PAR. E CESBRON: Bull. Soc. Franc. Mineral. Grist., 1964, 87, 125.

15.

Odnevall

and LEYGRAF

. Cotros. Sci., 1993, 34, 1213.

16.

Graedel

T. E.

: J. Electrochem. Soc., 1989, 136, 193C.

17.

Edney

E. O.

: ‘Effects of acidic deposition on materials’, State of Science/Technology Report 19, National Acid Precipitation Assessment Program, 1990.

18.

Allmann

: Z. Kristallogr., 1968, 126, 147.

Composition and morphology of corrosion products formed on galvanised steel exposed to a swimming pool atmosphere

Abstract

Get full access to this article

References