Conclusions
We have experimentally established that halides formed due to thermodestruction of nonmetal components of a generator increase the corrosion of copper components and can form solutions with a high content of copper (II) ions. Deaeration of a solution with hydrogen prevents the formation of a protective oxide film on copper and stimulates its dissolution. Pitting corrosion at sites of deposition of contact copper is characteristic of 12Khl8AG18Sh steel in NaCl+ CuCl2 solutions. Oxygen and copper (II) ions serve as depolarizers. Cu2+ ions are more efficient depolarizers than oxygen, which leads to a considerable increase in the density of the corrosion current of steel as compared with that in a 22% NaCl solution. Long-term holding retards the corrosion of steel, which can be explained by the blocking of its surface by reduced copper and undissolved copper (II) hydroxide.
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References
A. Balitskii, O. Krohmalny, and I. Ripey, “Hydrogen cooling of turbogenerators and the problem of rotor retaining ring materials degradation,”Int. J. Hydrogen Energy,4, 1–5 (1999).
Magdowski and M. O. Speidel,Presentation at Fourth P900 Colloquium, Essen, Germany (June 1997).
R. Crudeli, C. Rinaldi, L. Rossi, et al., “Case history of a 18Mn-18Cr retaining ring affected by stress corrosion cracks after 33500 operation hours,” in:Proceedings of Motor & Generator Predictive Maintenance & Refurbishment European Colloquium (CIGRE/EPRT 1997) (Florence) (1997), p. 5.
H. Feichtinger, G. Stein, and I. Hucklenbroich, “Case history of a 18Mn-18Cr retaining ring affected by stress corrosion cracks,” in:Proceedings of the Generator Retaining Ring Workshop (Miami, Florida, December 1997) (1997), pp. 1.1–1.29.
G. Stein, M. Wagner, and L. Hentz, “Investigation of crack formation on the inner diameter of a retaining ring,” in:Proceedings of the Generator Retaining Ring Workshop (Miami, Florida, December 1997) (1997), pp. 3.1–3.21.
O. I. Balyts’kyi and O. O. Krokhmal’nyi, “Pitting corrosion of 12Khl8AG18Sh steel in solutions of chlorides,”Fiz.-Khim. Mekh. Mater.,35, No. 3, 81–85 (1999).
O. O. Krokhmal’nyi, “Analysis of the operation of an 18Mnl8Cr steel-copper contact pair in a chloride solution at elevated temperatures,”Vopr. Khim. Khim. TekhnoL, No. 1, 203–205 (1999).
O. O. Krokhmal’nyi, “Corrosion of 12Khl8AG18Sh steel contacting with copper,”Fiz.-Khim. Mekh. Mater.,35, No. 4, 101–104 (1999).
F. Tödt,Korrosion und Korrosionsschutz, Walter de Gruyter, Berlin (1961).
L. A. Kul’skii (editor),Theoretical Foundations and Technology of Water Conditioning [in Russian], Naukova Dumka. Kiev (1980).
I. Ya. Klinov,Corrosion of Chemical Equipment and Corrosion Resistant Materials [in Russian], Mashinostroenie, Moscow (1977).
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 36, No. 2, pp. 121–123, March-April, 2000.
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Krokhmal’nyi, O.O. Electrochemical corrosion behavior of 12khl8ag18sh steel in chloride- containing media with copper (H) ions. Mater Sci 36, 296–299 (2000). https://doi.org/10.1007/BF02767552
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DOI: https://doi.org/10.1007/BF02767552