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Development of Particulate Zinc-Iron/PTFE Composite and Nanocomposite Coatings Using Electrodeposition

Mohagheghi Fard, Omid | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 51485 (56)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad
  7. Abstract:
  8. Electrodeposition is an old, well known and conventional science surface modification method to improve the surface characteristics, decorative and functional, of a wide variety of materials. This science is considered in nanotechnology as a bottom-up method for fabrication of one, two and three-dimensional nanomaterials. A great variety of secondary components can be added to plating baths resulting in metallic matrix composite and nanocomposite coatings production. Low amounts of iron addition for alloying zinc coatings, significantly increases the corrosion resistance of this generally used metal economically. Superhydrophobic coatings on metallic substrates have shown, during the past two decades, remarkable corrosion resistance in highly aggressive media. The water-repellency feature could be produced in Zn-Fe alloy coatings by introducing fine and ultrafine particles of PTFE to them, through sufficient dispersion of these particles, inside the alloy-plating bath and adequate agitation of the bath during and before plating processes. In this research, two amounts of CTAB were used per one-gram usage of PTFE to disperse them. 0.033 gr for fine and 0.132 for ultrafine PTFE particles were used. The amounts of 10, 20 and 40 g/L of fine and 1 and 2 g/L of ultrafine PTFE particles were added to acidic chloride Zn-Fe electroplating bath, optimized at the first stage by differing amounts of Sodium Citrate and Glycolic Acid and investigating their corrosion resistance. The tendency to corrode, in a slight chloride medium, was investigated through polarization resistance tests, for all coatings. The hydrophobicity properties of nanocomposite coatings were also investigated through measuring the amount of static contact angles of water droplets on their surfaces
  9. Keywords:
  10. Electrodeposition ; Composite Coating ; Zinc Coating ; Glycolic Acid ; Corrosion Resistance ; Hydrophobicity ; Fines ; Ultra-Fine Grain Materials ; Polytetrafluoroethylene(PTFE) ; Zinc Coating

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