Complex study of protective Cr3C2–NiAl coatings deposited by vacuum electro-spark alloying,pulsed cathodic arc evaporation,magnetron sputtering,and hybrid technology |
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Affiliation: | 1. National University of Science and Technology «MISiS», Leninsky Prosp., 4, 119049, Moscow, Russia;2. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Academician Osipyan Str., 8, Chernogolovka, Moscow Region, 142432, Russia;3. Research Institute of Natural, Synthetic Diamonds and Tools, Gilyarovskogo Street, 65, 129110, Moscow, Russia |
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Abstract: | Coatings were obtained by vacuum electro-spark alloying (VESA), pulsed cathodic arc evaporation (PCAE), magnetron sputtering (MS) techniques and VESA-PCAE-MS hybrid technology using Cr3C2–NiAl electrodes. The structure of the coatings was analyzed using scanning and transmission electron microscopy, X-ray diffraction and energy-dispersive spectroscopy. Mechanical properties were determined by nanoindentation, while tribological properties were assessed using pin-on-disk tribometer. Corrosion resistance was estimated by voltammetry in 1 N H2SO4 and 3.5%NaCl solutions. Oxidation resistance tests were performed at 800°С in air. The VESA coating had the highest thickness, low friction coefficient and high wear resistance. PCAE coating demonstrated the highest hardness (24 GPa) and elastic recovery (59%), oxidation resistance and superior corrosion resistance both in 1 N H2SO4 (icorr = 70 μА/cm2) and 3.5%NaCl (icorr = 0.74 μА/cm2) solutions. The MS coating had average mechanical properties and low corrosion current density (71 μА/cm2) in 1 N H2SO4. Deposition of coatings using VESA-PCAE-MS hybrid technology led to an increase in corrosion and oxidation resistance at least by 1.5 times in comparison with the VESA coating. |
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Keywords: | Magnetron sputtering Pulsed cathodic arc evaporation Vacuum electro-spark alloying Hybrid technology NiAl Coatings |
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