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    Title: 以有機酸溶液進行鎂合金表面處理之研究
    Other Titles: Surface processing of magnesium alloy in organic acid solutions
    Authors: 張景翔;Chang, Ching-hsiang
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    蔡子萱;Tsai, Tzu-hsuan
    Keywords: 表面處理;鎂合金;有機酸;腐蝕;Surface processing;Magnesium alloy;Organic Acid;Corrosion
    Date: 2010
    Issue Date: 2010-09-23 17:31:41 (UTC+8)
    Abstract: 輕量化、節能與環保訴求的趨勢下,鎂合金的發展日益重要;然而,鎂合金的高活性卻限制了它的發展,所以相關的加工成為鎂合金應用重要的處理步驟,為使每一道加工程序獲得最佳的品質,加工前的表面處理非常重要,目前此處理大多以人工研磨方式進行,缺乏一自動化、快速與穩定的處理方式。因此,本研究將鎂合金置於有機酸溶液中,進行浸泡、超音波震盪或化學機械研磨三種方式處理,比較三種處理方式後的移除量、表面光學性質及表面形貌,並討論有機酸和鎂合金間的反應機制。研究結果顯示使用B溶液可得到較高的移除量,而以化學機械研磨後的試片可得到較高的表面光澤度及較低的粗糙度,但是使用B溶液會使試片表面生成含鎂、鋁、鋅的沉澱物,進而影響鎂合金性質。使用A溶液進行化學機械研磨處理時,隨時間增加,移除量持續上升,且表面形貌差異小。在有機酸中加入乙醇,可使鎂合金移除量降低,其中以B加入乙醇後之移除量有較大幅度的減少,並且在表面形貌上亦有明顯的改變。以極化曲線分析鎂合金在B及A溶液中的反應機制發現,B溶液中的氫根離子與B酸根離子對鎂合金的溶解與鈍化作用是影響反應速率與表面形貌的關鍵;而鎂合金於A溶液中則僅有溶解作用。 將處理後之試片置於3.5 wt%鹽水中進行極化分析,結果發現使用A溶液進行化學機械研磨後的試片表面有最低的腐蝕電流與電位,故有更好的抗腐蝕能力表現。實驗發現使用A溶液進行化學機械研磨處理,可使鎂合金AZ31達到表面光澤度改善率495%,與粗糙度0.889 μm (Ra),優於其他處理程序。且可利用時間控制移除量;處理後的試片在抗腐蝕能力方面亦表現良好,具有取代人工機械研磨的潛力。
    In the trend of lightweight and energy-saving demands, magnesium alloys become important materials. However, magnesium alloys are susceptible to corrosion and this has limited the wide-spread application. Then a number of coating or surface processing for magnesium and its alloy are studied. This work used A and B to remove impurities and to level surface of magnesium alloys, AZ31; immersion, ultrasonic treatment or chemical mechanical polishing were conducted. The experimental results show that the removal amount of magnesium alloys was more in B than that in A, but high gloss improvement, 495%, and low surface roughness, 0.889 μm, were obtained after chemical mechanical polishing in A. In the processing with B, precipitates containing magnesium, aluminum and zinc were found, resulting in serious local corrosion on alloy surface. In addition, the application of ethanol in organic acids reduced the removal amount and changed surface topography of magnesium alloys, especially in B. The reaction mechanisms of magnesium alloys in B and A, and the corrosion behaviors in 3.5 wt% NaCl solutions were investigated using electrochemical polarization techniques. Our present study shows that A can be an alternative while B is not suitable for cleaning magnesium alloys, AZ31, and the better performance was conducted by chemical mechanical polishing than other processing.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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