Corrosion of 10CrNi45Al alloy in an oxidizing gas atmosphere

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Abstract

One of the basic technological operations of the currently developed pyrochemical technology for reprocessing spent nitride nuclear fuel from fast neutron reactors (SNF RBN) is high-temperature treatment (HTT) in a gas environment. The aim of the work was to study the effect of oxygen-containing gas environments: a dry mixture of Ar-20 vol. % O2 and a mixture of Ar-20 vol. % O2, with 60% humidity for the degradation of 10CrNi45Al alloy, a candidate material for the manufacture of the HTT apparatus. Corrosion tests lasting up to 1000 hours were carried out at 500°C. It was established by the X-ray diffraction method that the main corrosion products formed on the surface of samples kept in a dry gas atmosphere are Al2O3, Fe2O3 and NiFe2O4. The presence of moisture in the gas environment contributes to the formation of NiO and NiСrO4. In a dry gas mixture, an outer layer is observed on the surface of the sample, which is individual fragments of corrosion products: oxide compounds of iron, chromium, nickel. The surface of the material is covered with a continuous film with a thickness of 2 to 5 μm based on aluminum oxide. For samples tested in a wet gas mixture, a violation of the continuity of the internal protective layer was revealed. The outer loosened layer consists of iron oxides, under which a layer with a predominant content of oxygen-containing chromium compounds was revealed.

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About the authors

E. A. Karfidov

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Email: dedyukhin@ihte.ru
Russian Federation, Yekaterinburg

K. E. Seliverstov

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Email: dedyukhin@ihte.ru
Russian Federation, Yekaterinburg

I. D. Filippov

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Email: dedyukhin@ihte.ru
Russian Federation, Yekaterinburg

E. V. Nikitina

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Email: dedyukhin@ihte.ru
Russian Federation, Yekaterinburg

A. E. Dedyukhin

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: dedyukhin@ihte.ru
Russian Federation, Yekaterinburg

Yu. P. Zaykov

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Email: dedyukhin@ihte.ru
Russian Federation, Yekaterinburg

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Supplementary files

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2. Fig. 1. Schematic diagram of the setup for performing corrosion tests in an oxidizing gas environment: 1 - Varta thermostat; 2 - Combined device Shch 300-1; 3 - Pressure gauge; 4 - PGS cylinder; 5 - Quartz cell filled with distilled water; 6 - Resistance furnaces; 7 - Alundum crucible; 8 - Quartz cell; 9 - Silite heaters; 10,12 - Thermocouples in protective covers; 11 - RRG-12 gas flow regulator; 12,14 - Quartz tube for feeding gas into the system; 13 - Fluoroplastic cover with nickel screens; 15 - Hygrometers.

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3. Fig. 2. External appearance of the studied metal samples before (a) and after (b-d) corrosion tests in the Ar-20 vol. % O2 gas mixture: (a) – initial sample; Sample after corrosion tests in the dry Ar-20 vol. % O2 gas mixture: (b) – 100 hours, (c) – 500 hours; Sample after corrosion tests in the Ar-20 vol. % O2 gas mixture (60% humidity); (d) – 100 hours, (d) – 500 hours.

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4. Fig. 3. MRSA of the surface of 10ХН45Ю samples: (a) –500 hours in Ar-20 vol. % O2; (b) –500 hours Ar-20 vol. % O2 (60% humidity).

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5. Fig. 4. MRSA of cross-sectional sections of 10KhN45Yu samples: (a) – 500 hours in Ar-20 vol. % O2; (b) – 500 hours in Ar-20 vol. % (60% humidity).

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6. Fig. 5. Results of X-ray diffraction analysis of 10ХН45Ю material samples before and after corrosion tests (a) – initial sample; (b) – 500 hours in Ar-20 vol. % O2; (c) – 500 hours Ar-20 vol. % O2 (60% humidity).

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