OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 surface in the form of hematite (fig. 5, b). During 100 hours of testing, the specimens with coatings from 13.5 to 18.8 times less subjected to oxidation than Steel 35 due to limited oxygen contact with the steel substrate (fig. 5, c). The protective effect of the coatings increased with increasing the duty cycle, which is due to an increase in the specific number of discharges and, as a consequence, an increase in the thickness and continuity of the coatings. Conclusions 1. The possibility of using the anode material of Fe31W10Cr22Mo7B12C18 composition prepared by casting method for obtaining EDA coating of MG on carbon steel is shown. 2. With increasing in the pulse duty cycle by 3 and 9 times, the values of erosion increased by 1.2 and 5 times; the cathode weight increased by 1.5 and 2.2 times, respectively. At the lowest EDA intensity, the mass-transfer coefficient of EDA was the greatest. 3. In the composition of the prepared electrode materials Fe31W10Cr22Mo7B12C18 composition the α-WC, FeCr, Fe23B4, Mo2C, and MoFeB2 phases were found, while no sharp Bregge reflections were observed in the XRD spectra of the coatings, and a broad halo was present in the range of angles 2Ѳ = 40–50°, indicating the amorphous structure of metal glass. 4. The thickness of the coatings ranged from 56.1 to 80.6 μm, with roughness (Ra) from 5.46 to 7.34 μm. The coatings exhibited high water contact angle ranging from 108.4° to 121.3°, indicating high surface hydrophobicity of the developed coatings. 5. The friction coefficient of Fe31W10Cr22Mo7B12C18 metallic glass coatings was lower than that of carbon steel from 22 to 36 %. Its application allows to increase the wear resistance of carbon steel surface by 2.0– 3.3 times. The highest values of wear resistance were shown by the coating obtained at highest duty cycle. 6. Application of Fe31W10Cr22Mo7B12C18 coatings allows to increase high-temperature resistance of carbon steel at temperature 700 oC by 13.5–18.8 times. The best high-temperature resistance was shown for coating obtained at lowest duty cycle of EDA. a b c Fig. 5. High-temperature resistance of specimens at 700 °C as compared to uncoated Steel 35: kinetics of mass change Δm, g/cm2 (a); X-ray diffraction analysis of the coating surface after high-temperature resistance tests (b); change in high-temperature resistance of coated specimen (CS) and uncoated specimen (US) from pulse on-off time (c) References 1. Sivaraman R., Patra In., Zainab M.N., Hameed N.M., Alawsi T., Hashemi S. The effects of minor element addition on the structural heterogeneity and mechanical properties of ZrCuAl bulk metallic glasses. Advances in Materials Science and Engineering, 2022, vol. 2022, Art. 6528470. DOI: 10.1155/2022/6528470. 2. Chang J.C., Lee J.W., Lou B.S., Li C.L., Chu J.P. Effects of tungsten contents on the microstructure, mechanical and anticorrosion properties of Zr–W–Ti thin film metallic glasses. Thin Solid Films, 2015, vol. 584, pp. 253–256. DOI: 10.1016/j.tsf.2015.01.063.
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