Characterization of initial atmospheric corrosion of conventional weathering steels and a mild steel in a tropical atmosphere
The phases and compositions of the corrosion products of a mild steel (A-36) and two weathering steels (A-588 and COR 420) formed after 3 months exposure to the tropical marine atmosphere of Panama were examined using FTIR and Mössbauer spectroscopy. The results show that amorphous or crystallized iron oxyhydroxides goethite α-FeOOH and lepidocrocite γ-FeOOH are early corrosion products. Maghemite γ-Fe2O3 and magnetite Fe3O4 have also been identified and found to be prominent components for steels exposed to the most aggressive conditions. The formation of akaganeite β-FeOOH was observed when chlorides were occluded within the rust. FTIR showed the presence of hematite α-Fe2O3 in one sample.
KeywordsAtmospheric corrosion Weathering steel Carbon steel Tropical atmosphere Corrosion product
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- 4.Zhang, Q.C., Wu, J.S., Wang, J.J., Zheng, W.L., Chen, J.B., Li, A.B.: Corrosion behavior of weathering steel in marine atmosphere. Mater. Chem. Phys. 77, 603–608 (2002)Google Scholar
- 9.Southwell, C.R., Forgeson, B.W., Alexander, A.L.: NRL Report 5002, Corrosion of Metals in Tropical Environments. Part-2 Atmospheric Corrosion of Ten Structural Steels. Naval Research Laboratory, Washington D.C. (1957)Google Scholar
- 12.Jaén, J.A., Sánchez de Villalaz, M. de, Araque, L. de, Hernández, C. y Bósquez, A. de: Study of the corrosion products formed on carbon steels in the tropical atmosphere of Panama. Rev. Metal. Madrid Vol. Extr., 32–37 (2003)Google Scholar
- 13.ISO 9223: Corrosion of Metals and Alloys. Classification of Corrosivity of Atmospheres. International Standards Organization, Geneve (1991)Google Scholar
- 14.ISO 9226: Corrosion of Metals and Alloys. Method for Determination of Corrosion Rate of Standard Specimens for the Evaluation of Corrosivity. International Standards Organization, Geneve (1991)Google Scholar