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Study on Ni/Cu Alloy Plating and Pure Nickel Electrodeposition in Magnetic Fields

  • Author / Creator
    Wang, Tianfei
  • The processes of Ni/Cu electro-co-deposition and pure nickel electroplating in magnetic field have been investigated. Various techniques such as scanning electron microscope (SEM), atomic force microscope (AFM), X-ray diffractometer (XRD), and electrochemical characterization were used to determine the characteristics of electro-deposition. A reliable method has been developed to fabricate Ni/Cu coating film with uniform composition. The color of Ni/Cu deposits was found to be related to the residual stresses in the deposits, which could be altered by adjusting the pH level of the solution. The magneto-electrolytic deposition study found that MHD stirring in the bulk electrolyte has limited influence on the coating properties; however, MHD effect in the fluid boundary layer could modify the morphology and structure of the deposits. Three new models were proposed to interpret the underlying mechanisms on morphology and texture formation during nickel deposit in both parallel and vertical magnetic fields. The effect of the alternative magnetic field generated by spinning magnets on nickel deposition was also investigated and the coatings with better surface smoothness than static magnetic field had been achieved. The micro-hardness of the deposited nickel samples made in the absence and presence of magnetic field were evaluated. The hardness of the deposits can be well correlated to the surface roughness through a Hall-Petch-type relationship.

  • Subjects / Keywords
  • Graduation date
    2015-06
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/R3266T
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Doctoral
  • Department
    • Department of Chemical and Materials Engineering
  • Specialization
    • Materials Engineering
  • Supervisor / co-supervisor and their department(s)
    • Weixing, Chen (Chemical and Materials Engineering)
  • Examining committee members and their departments
    • Guohua, Chen ( Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology)
    • Thomas, Etsell (Chemical and Materials Engineering)
    • Jingli, Luo (Etsell, Thomas (Chemical and Materials Engineering)
    • Douglas, Ivey (Chemical and Materials Engineering)