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The Corrosion Behavior of Zinc and SiO2 Composite Coating  

, M.Sc. Thesis Sharif University of Technology Salehi, Farshad (Author) ; Ghorbani, Mohammad (Supervisor)
Abstract
Main aim of this work was to obtain the harder zinc coating and increasing the anti corrosive properties by mean of adding SiO2 particles by electrophoretic method.
The coating was applied on the substrate surface by mean of electro co-deposition technique in three different electrolytes ethanol, methanol and water. The morphology of the coating in each electrolyte studied by scanning electron microscope (SEM).For the Zn/SiO2 coatings achieved in ethanol solvent the polarization and EIS tests was took place and found that for the Zn/SiO2 coating contain less than 10% SiO2 the corrosion rate decreased but for the coatings contains more than 10% SiO2 the paradox occurred because of the... 

Cataloging brief

The Corrosion Behavior of Zinc and SiO2 Composite Coating  

, M.Sc. Thesis Sharif University of Technology Salehi, Farshad (Author) ; Ghorbani, Mohammad (Supervisor)
Abstract
Main aim of this work was to obtain the harder zinc coating and increasing the anti corrosive properties by mean of adding SiO2 particles by electrophoretic method.
The coating was applied on the substrate surface by mean of electro co-deposition technique in three different electrolytes ethanol, methanol and water. The morphology of the coating in each electrolyte studied by scanning electron microscope (SEM).For the Zn/SiO2 coatings achieved in ethanol solvent the polarization and EIS tests was took place and found that for the Zn/SiO2 coating contain less than 10% SiO2 the corrosion rate decreased but for the coatings contains more than 10% SiO2 the paradox occurred because of the... 

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  • Table of contents (7)
  • Introduction (14)
    • Zinc Coatings (14)
    • Electrophoretic Deposition (E.P.D.) (14)
    • Electrophoretic Deposition(E.P.D.) Mechanism (16)
    • Traditional approaches for EPD (17)
    • Flocculation by particle accumulation (17)
    • Particle charge neutralization mechanism (18)
    • Electrochemical particle coagulation mechanism (18)
    • Electrical double layer (EDL) distortion and thinning mechanism (19)
  • Literature review (21)
  • The characterization of electrodeposited Zn/SiO2 composites before and after corrosion test (21)
    • Anticorrosive behavior of Zn-SiO2 composite coatings (21)
    • Effect of the microstructure on corrosion behavior of the Zn-SiO2 coatings (22)
  • High corrosion resistance for Zn, Co, Cr with Al2O3 and SiO2 (26)
  • Zinc release from bioactive sol–gel derived SiO2-CaO-ZnO glasses and ceramics (26)
  • Lubrication behavior of Zn-SiO2 nano-spheres (27)
  • Antibacterial properties of nano-SiO2 supported silver/zinc–silver materials (30)
  • Adsorption of Ca2+ and Zn2+ ions at monodispersed SiO2 (30)
  • Experimental method (32)
    • Rinsing of plate (32)
    • Surface activation of substrate (32)
  • Electrolyte preparation (32)
  • Electroplating process (34)
    • Electrodeposition potential (35)
    • Electrodeposition time (35)
  • Effect of bath agitation (36)
  • Surface characterization of coatings (36)
    • Surface morphology by Scanning Electron Microscopy (SEM) (36)
    • Surface roughness by Atomic Force Microscopy (AFM) (36)
    • X-ray fluorescence (XRF) analysis (37)
  • Electrolyte stability (37)
    • Zeta potential measurements (37)
  • Coating adhesion to substrate (38)
  • Coating thickness determination (39)
  • Micro hardness of the coatings (39)
  • Electrochemical experiments (39)
    • Polarization behavior of deposition (40)
    • Electrochemical Impedance Spectroscopy (EIS) (40)
    • Cyclic Voltammetry (CV) (41)
  • Environmental corrosion tests (41)
    • Study of corrosion by salt spray (41)
  • Results and Discussion (43)
  • Steel substrate composition (43)
  • Solubility in electrolytes: (44)
  • Stability of electrolyte (46)
  • Thickness of the Zn-SiO2 coatings (48)
    • Effect of potential (49)
    • The effect of time on the thickness of the coating (50)
  • Effect of agitation on the Zn/SiO2 coating uniformity (51)
  • Morphology of the Zn-SiO2 coatings (52)
    • The surface morphology by Scanning Electron Microscopy (SEM) (52)
    • Characterization of the Zn-SiO2 coatings topography by Atomic Force Microscopy (AFM) (63)
    • Analysis of the coating by X-ray fluorescence (XRF) (70)
  • Electrochemical study of the Zn-SiO2 coatings (72)
    • Linear Polarization study of the Zn-SiO2 coatings (72)
    • Study the corrosion by electrochemical impedance spectroscopy (EIS) for the Zn-SiO2 coatings (74)
    • Cyclic voltammetry (CV) (80)
      • Coating adhesion to substrate by pull off test (83)
      • Hardness of the coating (84)
      • Study the environment corrosion of the coatings by salt spray test (86)
      • Conclusion (87)
      • Recommendation for further study (89)
  • Persian abstract.pdf
    • چکیده (90)
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