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URN etd-0815112-143247 Statistics This thesis had been viewed 2165 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 Date of Defense 2012-07-23 Date of Submission 2012-08-15