- 學位論文
純鋁金屬表面陽極奈米化經熱處理後之交流阻抗法研究
An Impedance Studies on Pure Aluminum Surface of Heat Treated for its nanosized Anodized Aluminum Oxide(AAO)
摘要
本研究主要是使用電化學交流阻抗分析法，對形成多孔質氧化鋁之試片在不同溫度下進行結構之分析。實驗加入1 wt% 的磷酸(Phosphoricacid)溶液做為陽極處理之電解液，首先將裁切好的鋁試片經過丙酮、酒精、水在超音波震盪機震盪10分鐘之後，再把試片置於陽極，白金片置於陰極，以電壓150V 進行30分鐘的陽極處理，再經由0.5M NaOH移除表面不規則的氧化膜，再進行第二次的陽極處理法4小時，接下來使用6wt% 磷酸擴孔液使其擴孔，表面會生成一層緻密且規則排列的六角形蜂巢結構之氧化膜。接下來於不同溫度下作熱處理，由XRD、SEM等機器觀察其各種熱處理溫度下之性質及形貌。最後以電化學交流阻抗法 (EIS) 分析。實驗結果發現形成多孔質氧化鋁之試片進行退火熱處理200℃時，觀察到長出大面積之微組織且豎立於結構上，進一步使用EIS儀器測量發現這一組試片有最大阻抗值，抗蝕能力最佳。
並列摘要
In this study, the AAO (Anodic Aluminum Oxide) nanotubes formed on the surfaces of Aluminum specimens were characterized by conducting the Electrochemical Impedance Spectrum (EIS) analysis for their structures. The anodization was performed in the cell of 1wt% Phosphoricacid with aluminum anode and platinum cathode. Experiments conditions were set with 150 voltage of applied potential for 30 minutes and used 0.5M NaOH to remove un-regular AAO，and then anodized 4 hours and used 6wt% Phosphoricacid widing for one hour to have an ordered channel-array of (AAO) nanotubes. Surface layer of dense and regular anrrangment of hexagonal honeybomb structre of the oxide film.The morphologies and properties of AAO nanotubes under the different temperature heat treatment were employed by using SEM and XRD. The results showed that the formation of porous aluminum membrane apecimem after annealing 200℃,showed a wide range of generating microorganization and erected on the strcture. The specimen has the largest impedance, the best corrosion resistance.