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Copper-cobalt/Tungsten Carbide Nano-composite Coatings Deposited on Pure Copper Substrate by Electrochemical Deposition

Khaleghpanah, Shila | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46876 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Abachi, Parvin; Dolati, Abolghasem
  7. Abstract:
  8. In this research a copper- Tungsten carbided nanocomposite coating prepared by electrodeposition from a sulfate bath in order to increase the hardness and erosion resistance of cooper without loosing cooper's specific physical properties as like as electrical and thermal conductivity. Various parameters were evaluated for finding significant factors in electrodeposition of Cu-Co/WC composite. Current density and concentration of WC and SDS were selected as affective factors. The morphology and structure were characterized by XRD and SEM. The mechanical properties of the coatings, such as hardness, wear resistance and surface roughness were studied with Vickers hardness indentation; pin on disk, wear test and atomic force microscopy, respectively. The corrosion resistance of coating was also used via Polarization and impedance techniques. In this research, 50 nanometer WC particles were used. Solutions containing 10, 20, 30 and 40 g/lit tungsten carbide were studied. Optimum results were obtained for a solution containing 30 gr/lit tungsten carbide under 60 mA/cm2 and in 50°C. The results demonstrated that the hardness, wear resistance, corrosion resistance, roughness and
    adherence of coating increase by enhancement of current density which is equal to increase of tungesten carbide in coating
  9. Keywords:
  10. Coverage ; Nanocomposite ; Copper ; Cobalt ; Tungsten Carbide ; Electrodeposition

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