Abstract
The corrosion products formed on carbon and weathering steels exposed in marine, industrial and rural environments in the United States for 16 years have been investigated using Mössbauer spectroscopy, Raman spectrometry and chemical analysis. Mössbauer spectroscopy was used to measure the fraction of each oxide in the corrosion coatings and micro-Raman spectrometry was used to locate and map the oxides to 2 µm spatial resolution. Mössbauer spectroscopy identified the corrosion products in the weathering steels as 75% goethite, 20% lepidocrocite and 5% maghemite. Raman analysis showed that the corrosion products generally formed as alternating layers containing different oxides. For the weathering steels the protective inner-layer closest to the steel substrate consisted of nano-sized goethite ranging in size from 5–30 nm and having a mean particle size of about 12 nm. The outer-layer close to the coating surface, consisted of lepidocrocite and goethite with the former oxide being most abundant. Electron probe micro-analysis measured significant chromium in the goethite close to the steel substrate. Comparison of the goethite in the corrosion products was made with synthetic chromium substituted goethite with nearly identical microstructural characteristics being recorded. It is concluded that chromium inclusions in the goethite are important for formation of a nano-phase oxide layer which may help protect the weathering steel from further corrosion.
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References
D.C. Cook, S.J. Oh and H.E. Townsend, The protective layer formed on steels after long-term atmospheric exposure, Corrosion'98, Technical Publication 343 (NACE International, Houston, TX, 1998).
S.J. Oh, Ph.D. dissertation, Old Dominion University, UMI Dissertation Services Publication No. 9811616 (1997).
H.E. Townsend and J.C. Zoccola, Eight-year atmospheric corrosion performance of weathering steel in marine, rural, and industrial environments, ASTM Standard Technical Publication 767 (ASTM, Philadelphia, PA, 1982) p. 45.
C.R. Shastry, J.J. Friel and H.E. Townsend, Sixteen-year atmospheric corrosion performance of weathering steels in industrial, rural, and marine environments, ASTM Standard Technical Publication 965 (ASTM, Philadelphia, PA, 1988) p. 5.
M. Yamashita, H. Miyuki, Y. Matsuda, H. Nahano and T. Misawa, Corr. Sci. 36 (1994) 283.
M. Yamashita, H. Miyuki and H. Nagano, The Sumitomo Search 57 (1995) 12.
M. Yamashita and T. Misawa, Recent progress in the study of protective rust-layer formation on weathering steel, Corrosion'98, Technical Publication 357 (NACE International, Houston, TX, 1998).
S. Morup, J.A. Dumesic and H. Topsoe, in: Applications of Mössbauer Spectroscopy, Vol. II, ed. R.L. Cohen (Academic Press, New York, 1980) p. 1.
L.H. Bowen, E. De Grave and R.E. Vandenberghe, in: Mössbauer Spectroscopy Applied to Magnetism and Materials Science, Vol. 1, ed. G.J. Long (Plenum, New York, 1993) p. 115.
E. Murad and J.H. Johnston, in: Mössbauer Spectroscopy Applied to Inorganic Chemistry, Vol. 2, ed. G.J. Long (Plenum, New York, 1987) p. 507.
W. Kündig, H. Bömmel, G. Constabaris and R.H. Lindquist, Phys. Rev. 142 (1966) 327.
T. Misawa, M. Yamashita, Y. Matsuda, H. Miyuki and H. Nagano, J. Iron Steel Inst. Japan 79 (1993) 69.
M. Yamashita, H. Nagano, T. Misawa and H.E. Townsend, ISIJ Internat. (1998) in press.
M. Yamashita, H. Miyuki, H Nagano and T. Misawa, Corr. Engrg. 43 (1994) 43.
S.J. Oh, D.C. Cook, S.J. Kwon and H.E. Townsend, in: Proc. 6th Latin American Conf. on Applications of the Mössbauer Effect (LACAME'98), Hyp. Interact. (1999) in press.
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Cook, D., Oh, S., Balasubramanian, R. et al. The role of goethite in the formation of the protective corrosion layer on steels. Hyperfine Interactions 122, 59–70 (1999). https://doi.org/10.1023/A:1012685320582
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DOI: https://doi.org/10.1023/A:1012685320582