Electrophoretic Deposition of Ni/SiO2 Nanocomposite Coating: Fabrication Process and Tribological and Corrosion Properties

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Ghalayani Isfahani, Arash | 2013

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Type of Document: M.Sc. Thesis
Language: English
Document No: 44016 (56)
University: Sharif University of Technology, International Campus, Kish Island
Department: Science and Engineering
Advisor(s): Ghorbani, Mohammad
Abstract:
Ni/SiO2 nanoparticle composite coatings were prepared by electrophoretic deposition (EPD) and their hardness, wear and corrosion resistance were examined. Additionally, the morphology of the coatings was observed. In the first phase, the feasibility of coating with Scanning Electron Microscopy (SEM) as well as X-ray diffraction (XRD) and Energy Dispersive Spectra (EDS) techniques was evaluated. After finding the effect of concentration of nanoparticles on coating characteristics and the results of using SEM, optimum conditions for uniform coating, acceptable adhesion at 20V and concentrations of 10 g/L for Ni, 1.2 g/L for SiO2, and choosing NiCl2 as additive with a concentration of 0.2 g/L was determined. Then, in order to improve the mechanical properties as well as resistance to corrosion, sintering was performed. The Ni/SiO2 nanocomposite coatings show excellent hardness, wear and corrosion resistance. In addition, by controlling the size of the SiO2 particles, in optimum coating voltage and proper time duration, hardness and wear resistance of nanocomposite coatings were controlled
Keywords:
Electrophoretic ; Silica Nanoparticles ; Nano-Composite Coating ; Hardness ; Abrasion Resistance ; Nickel Nanoparticle

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