A Study on Properties of Composite Coating with Al2O3 Base Prepared by Hard Anodizing with ZrO2 Nanoparticles

Motamen, Ali | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46862 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdollah
  7. Abstract:
  8. In this study anodized none composite and composite film containing ZrO2 nanoparticles were prepared on 1050 Al Alloy using hard anodizing method in sulfuric and oxalic acid mixed solution by pulse Currents. The microstructure and properties of the film were studied by field emission scanning electron microscopy with EDS analyzer and XRD diffraction and friction wear test were performed to evaluate the mechanical properties of coating . Results indicate that the composite film with ZrO2 nanoparticles have reduced friction coefficient with high micro hardness friction coefficient of composite film can be small as 0.16 which is much smaller than that 0.39 of none composite film. Micro hardness of composite film is 674 HV which is much greater than 498 HV of none composite film. and wear weight loss of the film with ZrO2 Nanoparticles is about 0.7 mg which is smaller than 1.4 mg for substrate and 32.9 mg of none composite film. Polarization tests indicate that icorr of Composite film is 0.245 A/dm2 wich is smaller than amount of 0.842 A/dm2 for none composite coating. The porosity percentage of none composite film is 1.05 % and 0.59 % for composite film. After sealing in nickel acetate solution hardness of composite film and none composite film increases about 3.41 % and 1.74 % and icorr decreases about 61.40% and 19.18% and friction coefficient of composite and none composite films after sealing is about 0.12 and 0.34
  9. Keywords:
  10. Zirconia ; Composite Coating ; Anodizing

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