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Title page for etd-0809109-100901


URN etd-0809109-100901 Statistics This thesis had been viewed 2226 times. Download 24 times.
Author Chin-Sheng Chen
Author's Email Address No Public.
Department Materials Engineering
Year 2008 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 153
Title Bpolar pulsed micro-arc oxidation on a LZ91 Mg-Li alloy
Keyword
  • Corrosion Resistance
  • Micro-arc Oxidation
  • MgO
  • Mg-Li alloy
  • Mg-Li alloy
  • MgO
  • Micro-arc Oxidation
  • Corrosion Resistance
  • Abstract This study aims to investigate pulsed bipolar of Micro-arc Oxidation (MAO) treatment on a Mg-9Li alloy under a variety of electric and electrolytic conditions. The main variables in the bipolar pulse of Micro-arc Oxidation treatment include T on+, T off +, Duty Ratio and frequency of the bipolar pulse electric wave and individual concentrations of NaB2BBB4BOB7B, NaOH, and NaB2BSiOB3B of the electrolyte. Examinations of the resulted oxidation films were carried out by using SEM, EDS, XRD, AFM, surface topology interferometer, coating thickness gauge, and potentionsate. The results showed that the electrolyte consisted of 10 g/L Na2SiO3, 14 g/L NaOH and 6 g/L Na2B4O7 yields the best outcomes of the bipolar pulse micro-arc oxidation treatment. It was found that the average size of the electric dischange holes in the oxide film decreases with decreasing T on+ and T off +, which leads to an improvement in the corrosion resistance of the protective oxide film. It was also found that the bipolar pulse waves with 10% duty ratio and 200 Hz frequency give the most satisfactory results of pulsed bipolar of micro-arc oxidation treatment of Mg-9Li alloy with an impressive Rp value of 3.8×107Ω, which is far better than that of the untreated Mg-9Li alloy(Rp=7.5×105).
    Advisor Committee
  • Chih-Fu Yang - advisor
  • Mu-Rong Yang - advisor
  • none - co-chair
  • none - co-chair
  • none - co-chair
  • Files indicate in-campus access at one year and off-campus not accessible
    Date of Defense 2009-07-27 Date of Submission 2009-08-10


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