OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 2 2022 Electrospark deposition of chromium diboride powder on stainless steel AISI 304 Alexander Burkov 1, a, *, Maria Kulik1, b, Alexander Belya 1, c, Valeria Krutikova 2, d 1 Institute of Materials Science of the Khabarovsk Scientifi c Center of the Far-Eastern Branch of the Russian Academy of Sciences, 153 Tikhookeanskaya, Khabarovsk, 680042, Russian Federation 2 Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, 65 Kim Yu Chen street, Khabarovsk, 680000, Russian Federation a https://orcid.org/0000-0002-5636-4669, burkovalex@mail.ru, b https://orcid.org/0000-0002-4857-1887, marijka80@mail.ru, c https://orcid.org/0000-0001-8795-3346, whitewolf-97@mail.ru, d https://orcid.org/0000-0001-9977-2809, nm32697@gmail.com Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2022 vol. 24 no. 2 pp. 78–90 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2022-24.2-78-90 ART I CLE I NFO Article history: Received: 24 February 2022 Revised: 15 March 2022 Accepted: 23 March 2022 Available online: 15 June 2022 Keywords: Electrospark deposition Stainless steel AISI 304 Chromium boride Wettability Corrosion Oxidation resistance Wear Acknowledgements Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. Austenitic stainless steel AISI 304 is the most widely used type of stainless steel. However, it is subject to wear due to relatively low hardness, and also begins to oxidize intensively in air at a temperature above 800 °C. The use of coatings based on chromium boride can improve its tribotechnical properties and oxidation resistance. The purpose of the work: to study the effect of chromium diboride concentration in the anode mixture on the structure, wear behavior, oxidation resistance and corrosion properties of electric spark coatings on AISI 304 steel. The research methods. Electric spark treatment of AISI 304 steel was carried out in a mixture of iron granules with the addition of CrB2 powder in amount of 5, 10 and 15 vol.%. The structure of the coatings was studied by X-ray analysis, scanning electron microscopy, and electron dispersion spectroscopy analysis. The wear resistance of the coatings was studied under dry friction condition at a load of 10 N. The oxidation resistance test was carried out at a temperature of 900 °C for 100 hours. Results and Discussion. According to X-ray analysis, it is shown that under the conditions of electric spark exposure, CrB2 interacts with iron melt; this has resulted in the formation of chromium and iron borides. Corrosion properties, microhardness, coeffi cient of friction and wear are investigated in comparison with AISI 304 steel. Samples with coatings showed a lower corrosion potential and corrosion current density compared to the substrate in 3.5% NaCl solution and from 5 to 15 times higher oxidation resistance. The microhardness of the coatings increased from 6.25 to 7.60 GPa with an increase in the addition of chromium diboride in the electrode mixture. The coeffi cient of friction and the wear rate of all coatings were lower than that of AISI 304 stainless steel, while the coating prepared with the addition of 5 vol.% chromium diboride had the best tribotechnical characteristics. For citation: Burkov A.A., Kulik M.A., Belya A.V., Krutikova V.O. Electrospark deposition of chromium diboride powder on stainless steel AISI 304. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2022, vol. 24, no. 2, pp. 78– 90. DOI: 10.17212/1994-6309-2022-24.2-78-90. (In Russian). ______ * Corresponding author Burkov Alexander A., Ph.D. (Physics and Mathematics), Senior researcher Institute of Materials Science of the Khabarovsk Scientifi c Center of the Far-Eastern Branch of the Russian Academy of Sciences, 153 Tikhookeanskaya, 680042, Khabarovsk, Russian Federation Tel.: 8 (914) 1618954, e-mail: burkovalex@mail.ru Introduction Austenitic stainless steel AISI 304 has excellent mechanical properties and good oxidation resistance, as well as high corrosion resistance in a wide variety of media. Because of this, AISI 304 is the most widely used type of stainless steel and is used as structural components subject to corrosion. So it is used in the manufacture of nuclear reactors, in the medical fi eld and in the food industry [1]. However, due to low hardness (~2 GPa), AISI 304 steel is highly susceptible to wear [2]. The addition of carbon can increase the
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