Abstract
Processes of the electrodeposition-dissolution on a niobium substrate have been studied by the chronopotentiometric method in the molten salt of NaCl-KCl-LaCl3 at the temperature of 1073 K. The electrolysis parameters leading to the formation of niobium-lanthanum solid solutions on the surface niobium have been established. Their heat-resistance has been determined in the air atmosphere at the temperature of 873 K. The possibility of the weak protection of niobium from oxidation due to the formation of LaNbO3 and LaNbO4 compounds on its surface has been demonstrated
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Andreev, Yu.Ya., Kobzeva, N.P., and Isaev, N.I., Increase of the heat resistance of nickel and its alloys by the galvanic diffusion saturation with lanthanum and neodymium from the molten salt, Zashch. Met., 1984, vol. 20, no. 6, pp. 957–959.
El’kin, O.V., Chebykin, V.V., and Kovalevskii, A.V., Kinetics of alloy formation in currentless transfer of ytterbium, samarium, and gadolinium onto nickel in chloride melts, Rasplavy, 2009, no. 4, pp. 20–26.
El’kin, O.V., Kovalevskii, A.V., and Chebykin, V.V., Preparation of nickel-samarium diffusion coatings by the currentless transfer method in the LiCl-KCl-SmCl3 melt, Gal’vanotekhnika i Obrabotka Poverkhnosti, 2010, vol. 18, no. 2, pp. 31–36.
El’kin, O.V., Kovalevskii, A.V., and Chebykin, V.V., Currentless diffusion saturation of nickel with gadolinium in the LiCl-GdCl3 melt, Izv. Vyssh. Uchebn. Zaved., Tsvetn. Metall., 2011, no. 5, pp. 35–39.
El’kin, O.V., Kovalevskii, A.V., and Chebykin, V.V., Preparation of surface alloys by diffusion saturation of cobalt with ytterbium and samarium in chloride melts, in Tezisy dokladov XIV Rossiiskoi konferentsii po fizicheskoi khimii i elektrokhimii rasplavlennykh i tverdykh elektrolitov (Abstracts of Papers of the 14th Russian Conference on Physical Chemistry and Electro-chemistry of Molten and Solid Electrolytes, Yekaterinburg, Russia, September 10–14, 2007), Yekaterinburg: Ural Branch of the Russian Academy of Sciences, 2007, vol. 1, p. 62.
Sims, C.T. and Hagel, W.C., The Superalloys, New York: Wiley-Interscience, 1972. Translated under the title Zharoprochnye splavy, Moscow: Metallurgiya, 1976.
Parshin, Yu.N., Maksimov, A.I., Ryabchenkov, A.V., and Alieva, N.Z., The influence of yttrium and zirconium on the grain growth and oxidation resistance of the 02Kh18103-type heat-resistant steel at 1300°C, Zashch. Met., 1982, vol. 18, pp. 889–895.
Savitskii, E.M., Kotel’nikov, G.A., Tetyueva, T.V., and Shumakova, I.A., Effects of influence of micromodification with cerium on the structure and properties of the 4Kh48MFS-type heat-resistant steel, Izv. Akad. Nauk SSSR, Met., 1983, no. 1, pp. 71–74.
Svetlov, M.B. and Kashuk, V.A., Heat resistance, thermal stability, and corrosion of the VT5L alloy micro-doped with rare-earth metals, Zashch. Met., 1983, vol. 19, no. 5, pp. 788–790.
Andreev, Yu.Ya., Kobzeva, N.P., Isaev, N.I., Anankin, V.F., Pivovarova, Yu.N., Zakharova, L.V., Kazain, A.D., Novichkov, V.Kh., and Batrakov, V.P., Method for preparation of coatings on titanium products, USSR Inventor’s Certificate no. 823460, Byull. Izobret., 1981, no. 15, p. 103.
Ilyushchenko, N.G., Klevtsov, L.P., Kovalevskii, A.V., and Soroka, V.V., Preparation of diffusion coatings of metals and alloys with yttrium and rare-earth metals in molten salts, IV Kol’skii seminar po elektrokhimii redkikh i tsvetnykh metallov. Tezisy dokladov., Apatity, 1983 (Abstracts of Papers of the 4th Kola Seminar on Electrochemistry of Rare and Non-Ferrous Metals, Apatity, Murmansk oblast, Russia, 1983), Apatity: Kola Scientific Center of the Academy of Sciences of the Soviet Union, 1983, pp. 68–69.
Borisenko, A.I. and Khashkovskii, S.V., Zashchita izdelii iz niobievykh splavov ot vysokotemperaturnoi gazovoi korrozii (Protection of Articles Made of Niobium Alloys from High-Temperature Gas Corrosion), Leningrad: Nauka, 1986.
Savitskii, E.M. and Terekhova, V.F., Metallovedenie redkozemel’nykh metallov (Metallography of Rare-Earth Metals), Moscow: Nauka, 1975.
Spedding, F.H. and Daane, A.H., The Rare Earths, New York: Wiley, 1961.
Baraboshkin, A.N., Elektrokristallizatsiya metallov iz rasplavlennykh solei (Electrocrystallization of Metals from Molten Salts), Moscow: Nauka, 1976.
Glagolevskaya, A.L., Kuznetsov, S.A., Polyakov, E.G., and Stangrit, P.T., Electrochemical reduction of lanthanum trichloride in the melt of sodium and potassium chlorides of the equimolar composition, Zh. Prikl. Khim. (St. Peterburg), 1987, vol. 60, no. 4, pp. 770–774.
Prokoshkin, D.A. and Vasil’eva, E.V., Splavy niobiya (Niobium Alloys), Moscow: Nauka, 1964.
Phillips, W.L., Some observations on the high-temperature oxidation of lanthanum, J. Electrochem. Soc., 1964, vol. 111, pp. 1184–1185.
Voitovich, R.F. and Golovko, E.I., Vysokotemperaturnoe okislenie metallov i splavov (High-Temperature Oxidation of Metals and Alloys), Kiev: Naukova Dumka, 1980, p. 11.
Kabanov, B.I., Astakhov, I.I., and Kisileva, I.G., Implementation—A new direction in the investigation of the kinetics of electrochemical precipitation and dissolution of metals, in Kinetika slozhnykh elektrokhimicheskikh reaktsii (Kinetics of Complex Electrochemical Reactions), Moscow: Nauka, 1981, pp. 200–240.
Kuznetsov, S.A., Kuznetsova, S.V., Polyakov, E.G., and Stangrit, P.T., Investigation of alloys formation during the electrodeposition of hafnium on the copper cathode in molten salts, Elektrokhimiya, 1990, vol. 26, no. 7, pp. 815–818.
Kuznetsova, S.V., Glagolevskaya, A.L., and Kuznetsov, S.A., Investigation of alloys formation during the electrodeposition of hafnium from melt onto the steel and graphite substrates, Zh. Prikl. Khim. (St. Peterburg), 1990, vol. 63, no. 10, pp. 2374–2377.
Kochergin, V.P., Obozhina, R.N., Dragoshanskaya, T.I., and Staruev, B.P., High-temperature corrosion of lanthanum in the equimolar mixture of chlorides of sodium and potassium, Zashch. Met., 1984, vol. 20, no. 2, pp. 310–312.
Oxydation des metaux, Benard, J., Ed., Paris: Gauthier-Villars, 1964. Translated under the title Okislenie metallov, Moscow: Metallurgiya, 1969, vol. 2.
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Original Russian Text © S.A. Kuznetsov, 2014, published in Fizika i Khimiya Stekla.
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Kuznetsov, S.A. Electrochemical surface modification of niobium by lanthanum in molten salts. Glass Phys Chem 40, 119–123 (2014). https://doi.org/10.1134/S1087659614010155
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DOI: https://doi.org/10.1134/S1087659614010155