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THE PHYSICAL BASES OF ELECTROLYTIC FORMATION OF CHROMIUM- SILICON DIOXIDE NANOCOMPOSITE SYSTEMS IN ELECTROLYTIC COATINGS

Yar-Mukhamedova, G Sh ; Darisheva, A M ; Moldabaev, M ; Karimova, I S ; Kalipekova, M A

International Multidisciplinary Scientific GeoConference : SGEM, 2011, Vol.2, p.753-753

Sofia: Surveying Geology & Mining Ecology Management (SGEM)

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  • Título:
    THE PHYSICAL BASES OF ELECTROLYTIC FORMATION OF CHROMIUM- SILICON DIOXIDE NANOCOMPOSITE SYSTEMS IN ELECTROLYTIC COATINGS
  • Autor: Yar-Mukhamedova, G Sh ; Darisheva, A M ; Moldabaev, M ; Karimova, I S ; Kalipekova, M A
  • Assuntos: Chromium
  • É parte de: International Multidisciplinary Scientific GeoConference : SGEM, 2011, Vol.2, p.753-753
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The main aim of the work is theoretical and experimental research of nanocomposite systems formation process on the model of chromium electrolytic coatings, ascertainment of laws and mechanisms of silicon dioxide nano-sized particles influence on the structure and properties of metal. We researched the process of electrolytic formation of chrome - silicon dioxide nanocomposite systems and nanostructured composite electrolytic coatings with silicon dioxide (3-50 nm) used as a dispersed phase. Methods of the research: atomic-force, raster electronic, optical microscopy, as well as IR-spectrometry, and roentgen-structural analysis. Estimation of endurance and corrosion resistance was made by weight. Main results and findings of the present research: -Analysis of contemporary state and perspective ways of nanotechnology development has made it possible to propose a new scientific approach for the solving the problem of Cr-SiO sub( 2) nanocomposite systems formation in electrolytic coatings. -On the basis of the research it has become possible to determine the electrolyte compositions for chrome - silicion dioxide nanocomposite systems formation, and it has been established that optimal content of silicon dioxide in the electrolyte is 20 g/1. A larger content of the second phase will cause sludging, dramatic lessening of current output, while lower content of S1O2 will not bring marked changes of the microstructure and getting the required properties of the nanocomposite system. -Mechanisms and natural laws were ascertained to determine influence of temperature, current density and ultrasonic exposure modes on the parameters of metal plating by nano-CEC. It has been shown, that increase of temperature and current density causes decrease of current output, and periodical ultrasonic exposure enables formation of nanocomposite systems with dense, finely crystalline and porous chromium matrix. -Researches with atomic-force, electronic and optical microscopy have revealed uncharacteristic for metals (chromium in particular) petal-like, globular structures predetermined by high activity of nano-sized particles of silicon dioxide. -Radiographic studies of nanocomposite systems formed at different temperatures established that changes of microhardness depend on the fact that within 298-323 K hexagonal chromium hydride (CrH) having microhardness 10,5-12 GPa deposits. In the temperature interval of 338-348 K mainly FCC chromium hydride with microhardness about 6- 1 0 GPa deposits.
  • Editor: Sofia: Surveying Geology & Mining Ecology Management (SGEM)
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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