| Autors: Petkov, V. P., Valov, R. V., Simeonova, S. S., Kandeva, K. M. Title: Characteristics and properties of chromium coatings with diamond nanoparticles deposited directly on aluminum alloys Keywords: Chromium coating, Aluminum alloy, Diamond nanoparticles, Ato Abstract: The objective of this study was to deposit directly chromium with diamond nanoparticles (ND) on aluminum alloys and investigate the coating surface. The chromium coatings on aluminum alloys were obtained by electrochemical deposition. The coatings were doped with ND. The diamond nanoparticles were obtained by detonation synthesis. Chromium coatings were deposited on aluminum alloys with a silicon content of 7 % and 10 %. The ND concentration in the electrolyte was 25 g/l. The surface analysis was performed by means of Atomic force microscopy. The surface of the coating of chromium with ND on Al10Si is twice more even than that on Al7Si. The microstructure and microhardness were examined with a metallographic microscope and a microhardness tester. The microhardness of the coated samples is 9163 MPa compared to 893 MPa of uncoated aluminum samples. The thickness of the chromium coatings doped withdiamond nanoparticles is between 45 – 55 μm. References Issue
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