Abstract
Composition of corrosion layers on steel 20 in aerated solutions with hydrazine concentrations less than 11 ppm was studied at 50, 60, and 80°C in dynamic conditions by transmission Mössbauer spectroscopy and X-ray diffraction as supplementary technique. Corrosion rates were determined by gravimetric method. A comparison with corrosion in water at 80°C was made. The observed layers have not any protective character. For 0.1 m/s linear velocity, they are composed by nonstoichiometric magnetite, (Fe3−x O4,x=0.02–0.04) with lepidocrocite (γ-FeOOH) as secondary phase at 50°C. Haematite (α-Fe2O3) is observed at 60 and 80°C with a 19 nm particle size. It becomes smaller for higher velocity (0.7 m/s).
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A.P. Akolzin, in:Protivokorrozionnaya zaschita stali plenkoobrazovateliami, (Moskva “Metallurgiya”, 1989).
J.R. Rodriguez Beltrán, in:Tratamiento de agua para las instalaciones energéticas nucleares (Pueblo y Educación, La Habana, 1986) p. 140.
E. Merck, in:Análisis de agua (Darmstadt, Germany) p. 147.
P. Korostelev, in:Titrimetricheskij i gravimetricheskij analiz v metallurgii, (Moskva, Metallurgiya, 1985).
K. Volenik et al., A Mössbauer and X-ray diffraction study of nonstoichiometry in magnetite, Czech. J. Phys. B 25 (1975) 1063.
B.D. Cullity, in:Elements of X-ray diffraction (Pueblo y Educación, La Habana, 1980).
N.N. Brusov et al., in:Produkty Korrozii v Konturakh atomny stantsii (Moskva, Energoatomizdat, 1988).
Kunding et al., Phys. Rev. 142 (2) (1966) 327.
G.N. Belozerskii et al., Zh. Obsch. Kh. 50(6) (1980) 1209–1213.
E. Murad and J.H. Johnston, in:Mössbauer, Spectroscopy Applied to Inorganic Chemistry, ed. Gary J. Long, Vol 2 (Plenum Press, 1987) p. 507.
L.N. Moskvin, in:Metody khimicheskogo i radiokhimicheskogo kontroliya v yadernoi energetike (Energoatomizdat, 1989) p. 104.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Herrera, V., Hernandez, D. Corrosion products on steel 20 in aerated hydrazine solutions: Mössbauer study. Hyperfine Interact 67, 575–579 (1991). https://doi.org/10.1007/BF02398203
Issue Date:
DOI: https://doi.org/10.1007/BF02398203