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Title page for etd-0815112-143247


URN etd-0815112-143247 Statistics This thesis had been viewed 2227 times. Download 835 times.
Author Yu-Chieh Hsu
Author's Email Address No Public.
Department Materials Engineering
Year 2011 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 111
Title A study on the Surface Flattening and Corrosion Resistance in Bipolar pulsed Micro-arc Oxidation of a Mg-Li Alloy
Keyword
  • micro-arc oxidation
  • surface flatness
  • corrosion resistance
  • Mg-Li alloy
  • Mg-Li alloy
  • corrosion resistance
  • surface flatness
  • micro-arc oxidation
  • Abstract In this research the corrosion resistance and the surface flattening of a bipolar pulsed Micro-arc Oxidation (MAO) treatmented LAZ951 Mg alloy (Mg-9Li-5Al-1Zn) were studied. The main process variables include processing time from 5 to 20 min, reverse loading current (-I) from 1 to 3 Amp/dm2 and reverse loading time (Ton-) from 1,000 to 3,500 μs. Poperties of the resulted MAO film were examined by using SEM, EDS, XRD, ICP-OES, coating thickness gauge, surface topology interferometer and potentionstate. The results show that, when operated under a specific condition of processing time of 10 min, reverse loading current of 1 Amp/dm2 and reverse loading time of 3,000 μs, a MAO film with most satisfactory combination of corrosion resistance (Ecorr = -1.3 V, Icorr = 1.8×10-8 amp/cm2) and surface flatness (Rz = 7.6 μm) was produced. In the post-MAO treatment, it was found that a water soluble coating with 2% silane can effectively enhance both the corrosion resistance (Ecorr = -1.42 , Icorr = 3.5×10-9 amp/cm2) and surface flatness (Rz = 3.4 μm) of the MAO specimen.
    Advisor Committee
  • Chih-Fu Yang - advisor
  • Mu-Rong Yang - advisor
  • Chum-Mu Chen - co-chair
  • Jien-Wei Yeh - co-chair
  • Sheng-Long Lee - co-chair
  • Files indicate in-campus access at 2 years and off-campus access at 2 years
    Date of Defense 2012-07-23 Date of Submission 2012-08-15


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