Mechanism of corrosion resistance of nickel-molybdenum alloys
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With the use of a combination of electrochemical and γ-ray spectrometric methods and also of photoelectronic spectroscopy the rules of partial processes of dissolution of the components of nickel-molybdenum alloys and of the change in composition of their surface as a result of dissolution were investigated.
The existence of two basic areas of potentials having the greatest value for industrial use of the alloys was established. Considerations were given on the probably mechanisms of corrosion resistance of the alloys according to which the high retarding action of molybdenum and the investigated inhibitors (I− ions and propargylic alcohol) are caused by blocking of active centers of the surface being dissolved. Together with this, with sufficiently negative potentials it is possible to have an additional retarding effect from the passivating film formed here, which is enriched with molybdenum oxides.
KeywordsOxide Alcohol Spectroscopy Molybdenum Corrosion Resistance
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- 1.T. V. Svistunova, “The correction resistance of nickel base alloys,” in: New Steels and Alloys in Machine Building [in Russian], Mashinostroenie, Moscow (1976), pp. 143–151.Google Scholar
- 2.Ya. M. Kolotyrkin, “Electrochemical aspects of the corrosion of metals,” Zashch. Met.,11, No. 6, 675–686 (1975).Google Scholar
- 3.N. N. Rodin, A. V. Plaskeev, M. A. Debrovskii, Ya. M. Kolotyrkin, and V. M. Knyazheva, “Determination of low partial rates and of the mechanism of solution of multicomponent steels by γ-ray spectrometry,” Zashch. Met.,9, No. 4, 387–394 (1973).Google Scholar
- 4.A. G. Akimov, “Electron spectrometry of the surface of metals — a new method of solving corrosion problems,” Zashch. Met.,12, No. 2, 133–144 (1976).Google Scholar
- 5.K. Leigraf, G. Khul'tkvist, I. Olef'erd, B. El'fstrem, V. M. Knyazheva, A. V. Plaskeev, and Ya. M. Kolotyrkin, “An investigation of the rules of solution of components and of the formation of the surface layer on FeCr 18 and FeCr 18-Mo 3 single-crystal alloys in the passive state,” Zashch. Met.,15, No. 4, 395–407 (1979).Google Scholar
- 6.N. D. Green, “Passivity of nickel and nickel-based alloys,” in: Metallic Corrosion, 1961, Butterworths (1962).Google Scholar
- 7.A. A. Pozdeeva, É. I. Antonovskaya, and A. M. Sukhotin, “The passivity of molybdenum,” Zashch. Met.,1, No. 1, 20–28 (1965).Google Scholar
- 8.N. S. Neiman, Ya. M. Kolotyrkin, V. M. Knyazheva, A. V. Plaskeev, and M. A. Dembrovskii, “The question of the electrochemical corrosion properties of molybdenum in acid media,” Dokl. Akad. Nauk SSSR,216, No. 6, 1331–1334 (1974).Google Scholar
- 9.I. Olefjord, “ESCA studies the composition profile of low temperature oxide formed on chromium steels. I. Oxidation in dry oxygen,” Corros. Sci.,15, No. 11/12, 687–696 (1975).Google Scholar
- 10.Ya. M. Kolotyrkin and V. M. Knyazheva, “The question of the selective solution of components of corrosion-resistant alloys,” Izv. Sev.-Kavkaz. Nauch. Tsentra Vysshei Shkoly, Ser. Estestv. Nauk, No. 2, 11–19 (1974).Google Scholar
- 11.V. M. Knyazheva, Ya. M. Kolotyrkin, A. V. Plaskeyev (Plaskeev), V. B. Kozhnevnikov, M. A. Dembrovskii, and E. N. Lubnin, “Basic regularities of the dissolution of the components of iron-based alloys in the passive state and the role of molybdenum in their corrosion resistance,” in: Proceedings of the First Soviet-Japanese Seminar on Corrosion and Protection of Metals [in Russian], Nauka, Moscow (1979), pp. 127–143.Google Scholar
- 12.A. P. Pchel'nikov, A. D. Sitnikov, and V. V. Losev, “Selective ionization of the negative component in solution of a binary alloy (tin-zinc),” Zashch. Met.,13, No. 3, 288–296 (1977).Google Scholar
- 13.Ya. M. Kolotyrkin, G. G. Lopokov, and L. A. Medvedeva, “The influence of iodine ions on the kinetics of solution of nickel in acid solutions of electrolytes,” Zashch. Met.,5, No. 1, 3–9 (1969).Google Scholar
- 14.B. Ya. Konyaev, “The retarding of corrosion of nickel by additions of propargylic alcohol in deaerated solutions,” Zashch. Met.,14, No. 3, 353–355 (1978).Google Scholar
- 15.Ya. M. Kolotyrkin, A. V. Plaskeev, V. M. Knyazheva, V. B. Kozhevnikov, and G. S. Raskin, “The mechanism of influence of molybdenum on the corrosion behavior of stainless steels,” Dokl. Akad. Nauk SSSR,243, No. 6, 1483–1486 (1978).Google Scholar
- 16.Ya. M. Kolotyrkin, “The modern state of the theory of passivity of metals,” in: The Corrosion of Chemical Equipment [in Russian], No. 67, Mosk. Inst. Khim. Mashinostr. (1975), pp. 5–21.Google Scholar