鋁-X鋅-Y鎂-Z銅(X=4.5,6%; Y=1.5, 2.5%; Z=0,1.5%)鋁合金陽極能量與皮膜品質分析;Energy Analyses and Quality of Aao Films on Al- X Zn -Y Mg - Z Cu (X=4.5,6%; Y=1.5, 2.5%; Z=0,1.5%)

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題名:	鋁-X鋅-Y鎂-Z銅(X=4.5,6%;Y=1.5, 2.5%;Z=0,1.5%)鋁合金陽極能量與皮膜品質分析;Energy Analyses and Quality of Aao Films on Al- X Zn -Y Mg - Z Cu (X=4.5,6%;Y=1.5, 2.5%;Z=0,1.5%)
作者:	施登士
貢獻者:	機械工程學系
關鍵詞:	Al-Zn-Mg;Al-Zn-Mg-Cu aluminum alloys;deformation;dislocation density;AAO films;研究領域：材料科技
日期:	2011-08-01
上傳時間:	2012-01-17 17:49:49 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	近年來由於政府大力推動節能生活，人們生活習慣大大的與自行車結合在一起，進而促使國內自行車產業逐漸走出一條新的道路。為了使自行車能夠更輕更方便攜帶，因此自行車的零件常使用為鋁合金。除了重量減輕之外，車身零件的強度亦是需要一起考量。鋁-4.5wt%鋅-1.5wt%鎂(AA7005)與鋁-6wt%鋅 -2.5wt%鎂-1.5wt%銅(AA7075)鋁合金，鋁合金中強度最好的就是7xxx系列合金，可利用擠製或鍛造等方式製成鋁車館或複雜形狀鍛件。鋅在這系列中是主要合金元素，加上少許鎂合金可使材料能受熱處理，可達非常高強度特性。其中以編號7075-T651鋁合金強度高達(UTS: 572MPa; Ys: 503MPa, elongation: 11%)，自行車業界常用7005T63與7075T73處理做為部分車架構架及高強度配件。鋁合金陽極皮膜的應用可改善其鋁合金抗腐時特性。鋁-鋅-鎂、鋁-鋅-鎂-銅合金經過加工與固溶、時效熱處理後，基地微結構變化對7xxx系列鋁合金硬化陽極皮膜品質和尺寸穩定性有相當的影響。鋁-鋅- 鎂、鋁-鋅-鎂合金受到變形後，基地中差排密度、動態再結晶、晶粒和析出相尺寸及形態都會有顯著的變化；一般陽極與硬化陽極處理的製程參數對陽極皮膜品質亦有顯著的影響，包含陽極皮膜孔洞大小(pore size)、皮膜孔洞密度(pore density)與皮膜膜厚(thickness)以及光學性質…等。所以鋁-鋅-鎂、鋁-鋅-鎂鋁合金的加工與變形對基地微結構變化以及陽極處理後皮膜品質的影響值得深入探討。本計畫擬測量陽極處理時定電流下電壓(V)-時間(t)變化曲線變化並計算陽極焦耳熱(joule heat)能量，探討鋁-4.5wt%鋅-1.5wt%鎂(AA7005)與鋁-6wt%鋅-2.5wt%鎂-1.5wt%銅(AA7075)鋁合金基地微結構變化對於陽極皮膜品質的影響。使用SEM與TEM觀察應變量(0%、40%)對鋁基地中晶粒尺寸、差排密度與差排胞大小的改變，以及硬化陽極所產生的焦耳熱對析出物尺寸及型態的影響，XPS與SIMs分析陽極皮膜的(Al3+, Zn2+, Mg2+…)等離子與O2-之間的組成變化，並利用EIS測試陽極皮膜的化學性質及AFM檢測陽極皮膜表面粗糙度與不規則生長陽極膜之間的關係，提供業界生產鋁-鋅-鎂或鋁-鋅-鎂-銅合金陽極皮膜檢測參考數據與自行車業界生產高品質鋁合金零件的重要陽極技術資料。 In recent year, Al7xxx series of aluminum alloys are widely used for making bicycle parts due to their lightweight, superior mechanical properties. The typical example is Al 7075 high strength aluminum alloy. Anodization treatment often adopted to increase the cosmetic value in appearance and improve corrosion and wear resistance. This study intends to investigate the effect of deformation on changing the matrix’s structure of Al- 4.5wt% Zn- 1.5wt% Mg (7005) and Al- 6wt% Zn- 2.5wt% Mg- 1.5wt% Cu (7075) alloy and on the quality of anodized aluminum oxide film. Especially, Al7075 alloy that contains about 6wt% Zn, 2.5wt% Mg and about 1.5wt% Cu is a heat treatable alloy to have precipitation hardening. The deformed process (ex: rolling) which brings about dislocations in matrix subsequently to affect the precipitation hardening in matrix. As a result, the anodic aluminum oxide film (AAO) could also be altered in pore size, pore population and/or Zn, Mg and Cu ions transport movement to vary the constituent phases (or oxide) in the resultant AAO film. In the experiment, the voltage (for a given current density) versus time will be measured and recorded during anodizing treatment. The measured values will be used to calculate the energy consumed in each steps of anodizing process. SEM and TEM would be used to observe the matrix and AAO film morphology, including pore size and density, dislocation cells, and precipitates in matrix. XPS and SIMs analyses will be adopted to study the constituted phases (or oxides) and ions intensity over the AAO film. The energy consumed (Joule heat), that affected by the variation of precipitate size, on changing the quality of AAO film will be investigated. The qualities of AAO film after sealing will be tested by EIS and the light reflectance of AAO films will also be evaluated in the study. 研究期間：10008 ~ 10107
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
顯示於類別:	[機械工程學系] 研究計畫

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