TiN/Cr/Al2O3 and TiN/Al2O3 hybrid coatings structure features and properties resulting from combined treatment |
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Authors: | AD Pogrebnjak YuA Kravchenko ShM Ruzimov P Misaelides |
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Affiliation: | a Sumy Institute for Surface Modification, St.87 Romenskaya, Bld.“M”, 40002 Sumy, Ukraine b Institute for Nuclear Physics NAN, Almaty, Kazakhstan c National University of Uzbekistan, Tashkent, Uzbekistan d Chemistry Faculty, Aristotle University, 54124 Thessaloniki, Greece |
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Abstract: | New experimental results are presented on the structure and the elemental and phase composition of hybrid coatings, which were deposited on a substrate of AISI 321 stainless steel using a combination of plasma-detonation, vacuum-arc and subsequent High-Current Electron Beam (HCEB) treatment. We found that an increase in energy density intensified mass transfer processes and resulted in changes in aluminum oxide phase composition (γ → α and β → α). Also we observed the formation of a nanocrystalline structure in Al2O3 coatings. Electron beam treatment of a hybrid coating surface induced higher adhesion, decreased the intensity of surface wear and increased corrosion resistance in a sulphuric acid solution. The corrosion resistance of the coatings was studied in several electrolytic solutions (0.5 M H2SO4, 1 M HCl, 0.75 M NaCl) using electrochemical techniques. In most cases the corrosion resistance was improved, except those in NaCl solutions. The nano-hardness of the protecting coating was 13 GPa before electron beam melting and 9 GPa after it (as a result of TiN and Al2O3 sub-layers mixing). |
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Keywords: | Hybrid process Protective coatings Plasma jet Vacuum-arc deposition Electron beam treatment Adhesion Nano- and micro-hardness Wear and corrosion resistance |
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