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Production of Zn-Tio2 Nanocomposite Coating by Electrochemical Method and Investigation of its Properties

Sajjadnezhad, Mohammad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42348 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Ghorbani, Mohammad; Afshar, Abdollah
  7. Abstract:
  8. Pure zinc coating and Zn-TiO2 composite coating were deposited from two methods: Direct and Pulse Current from a sulphate bath. D.C. section, current density and particle concentration in electrolyte were investigated. Moreover in Pulse section, frequency, duty cycle and maximum current density were investigated as parameters. Morphological properties of these coatings were investigated by FE-SEM and corrosion behavior by potentiodynamic polarization in 1M NaCl. In D.C. section, in investigation of the effect of current density, an optimum was observed in case of obtaining the highest amount of deposited particles at 0.1 A/cm2 and amount of 2.93%. This amount is the highest one in D.C. deposited specimens. In D.C. section, it was observed that Zn-TiO2 (5 g/L) nanocomposite coating produced at 0.12 A/cm2 with corrosion current density of 2.7 μA/cm2 had a better corrosion resistance related to pure zinc coating in the same conditions . Also in Pulse section, in investigation of the effect of maximum current density the amount of deposited particles became more than 2.93% (5.09% in 0.08 A/cm2 and 3.84% in 0.1 A/cm2 maximum current density and 10 Hz frequency). In pulse section, it was observed that Zn-TiO2 (5 g/L) nanocomposite coating produced at 0.12 A/cm2 maximum current density, 10 Hz frequency and 75% duty cycle (with corrosion current density of 15.1 μA/cm2) and also the same coating at 0.08 and 0.1 A/cm2 maximum current density (with corrosion current density of 18.2 and 20.6 μA/cm2 respectively ) had a better corrosion resistance related to the pure zinc coating in the same condition of pulse deposition
  9. Keywords:
  10. Nano-Composite Coating ; Pulse Current ; Ultrasonic Waves ; Titanium Oxide Nanoparticles ; Electrochemical Codeposition ; Direct Current

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