OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 2 2022 crease in the volume of the plastic metal binder in these coatings and increasing brittleness under friction. In addition, when analyzing the wear resistance of a Cr5 sample, it is worth considering the large thickness of this coating compared to other samples, as indicated by the data on the cathode weight gain (Fig. 2, a). Conclusion Cermet Fe-Cr-B coatings were formed on AISI 304 stainless steel by electrospark treatment in a mixture of iron granules and 5-15 vol.% CrB2 powder. The largest cathode weight gain and coating thickness were in case of using an anode mixture with 5 vol.% CrB2. The X-ray data indicate the cermet structure of the coatings, where the role of the binder is performed by ferrochrome, and the role of ceramics are performed the Cr5B3, Cr2B, and Fe23B6 phases. The borides were formed as a result of the complete destruction of CrB2 upon interaction with an iron melt under the conditions of an electric discharge. With an increase in the concentration of CrB2 in the anode mixture, an improvement in the anticorrosion properties of Fe-Cr-B coatings in a 3.5% NaCl solution and an increase in oxidation resistance compared to AISI 304 steel from 5 to 15 times were observed. The use of electrospark Fe-Cr-B coatings on AISI 304 stainless steel makes it possible to increase its surface hardness, reduce and stabilize the friction coeffi cient, and improve wear resistance by 3.7 times. References 1. Mahdavi A., Medvedovski E., Mendoza G.L., McDonald A. Corrosion resistance of boronized, aluminized, and chromized thermal diffusion-coated steels in simulated high-temperature recovery boiler conditions. Coatings, 2018, vol. 8, iss. 8, p. 257. DOI: 10.3390/coatings8080257. 2. Frutos A. de, Arenas M.A., Fuentes G.G., Rodríguez R.J., Martínez R., Avelar-Batista J.C., Damborenea J.J. de. Tribocorrosion behaviour of duplex surface treated AISI 304 stainless steel. Surface and Coatings Technology, 2010, vol. 204, iss. 9–10, pp. 1623–1630. DOI: 10.1016/j.surfcoat.2009.10.039. 3. Ushashri K., Masanta M. Hard TiC coating on AISI304 steel by laser surface engineering using pulsed Nd: YAG laser. Materials and Manufacturing Processes, 2015, vol. 30, iss. 6, pp. 730–735. DOI: 10.1080/10426914.20 14.973593. 4. Sahoo C.K., MasantaM. Microstructure andmechanical properties of TiC-Ni coating onAISI304 steel produced by TIG cladding process. Journal of Materials Processing Technology, 2017, vol. 240, pp. 126–137. DOI: 10.1016/j. jmatprotec.2016.09.018. 5. Golyshev A.A., Orishich A.M. Issledovanie vliyaniya rezhimov fokusirovki lazernogo izlucheniya na geometricheskie i mekhanicheskie svoistva metallokeramicheskikh trekov [Study of the laser radiation focusing modes effect on geometrical and mechanical properties of metal-ceramic tracks]. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Materials Science, 2019, vol. 21, no. 1, pp. 82–92. DOI: 10.17212/1994-6309-2019-21.1-82-92. 6. Yan D., He J., Wu J., Qiu W., Ma J. The corrosion behaviour of a plasma spraying Al2O3 ceramic coating in dilute HC1 solution. Surface and Coatings Technology, 1997, vol. 89, iss. 1–2, pp. 191–195. DOI: 10.1016/S02578972(96)02862-9. 7. Berger L.-M. Application of hardmetals as thermal spray coatings. International Journal of Refractory Metals and Hard Materials, 2015, vol. 49, pp. 350–364. DOI: 10.1016/j.ijrmhm.2014.09.029. 8. Mishigdorzhiyn U.L., Sizov I.G., Polaynsky I.P. Formirovanie pokrytii na osnove bora i alyuminiya na poverkhnosti uglerodistykh stalei elektronno-luchevym legirovaniem [Formation of coatings based on boron and aluminumon the surface of carbon steels by electron beamalloying]. Obrabotkametallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Materials Science, 2018, vol. 20, no. 2, pp. 87–99. DOI: 10.17212/1994-63092018-20.2-87-99. 9. Yao H.H., Zhou Z., Wang Y.M., He D.Y., Bobzin K.,· Zhao L., Öte M., Königstein T. Microstructure and properties of FeCrB alloy coatings prepared by wire-arc spraying. Journal of Thermal Spray Technology, 2017, vol. 26, iss. 3, pp. 483–491. DOI: 10.1007/s11666-016-0510-9. 10. Kılıç M. Microstructural characterization of Ni-based B4C reinforced composite coating produced by tungsten inert gas method. Archives of Metallurgy and Materials, 2021, vol. 66 (3), pp. 917–924. DOI: 10.24425/ amm.2021.136398. 11. Turkoglu T., Ay I. Investigation of mechanical, kinetic and corrosion properties of boridedAISI 304, AISI 420 and AISI 430. Surface Engineering, 2021, vol. 37, iss. 8, pp. 1020–1031. DOI: 10.1080/02670844.2021.1884332.
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