Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11122
標題: 純鎂薄膜為犧牲陽極以陰極保護AZ91D鎂合金之防蝕研究
Sacrificial Mg film anode for cathodic protection of die cast Mg-9wt.%Al-1 wt.%Zn alloy
作者: 謝仁翔
Xie, Ren-Xiang
關鍵字: AZ91D magnesium alloy
AZ91D鎂合金
acid pickling and surface activation
cathodic protection
酸洗活化處理
陰極保護
出版社: 材料工程學系所
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摘要: 摘要 鎂合金廣泛的應用於3C產業和運輸工業,但鎂合金屬於容易腐蝕的合金,所以鎂合金需藉由適當的表面處理來提高抗腐蝕性。本實驗以熱蒸鍍法將3N純鎂蒸鍍於壓鑄鎂合金試片上,由於純鎂較為活潑,所以試圖以純鎂鍍膜作為犧牲陽極,對壓鑄鎂合金基材進行陰極防蝕。 本實驗會先將欲蒸鍍純鎂的試片經前處理,使提純鎂薄膜和基材的接合力。由極化試驗發現,經酸洗活化處理的試片可以得到最低的腐蝕電流密度(8μA/cm2)。蒸鍍時,先固定蒸發源和基材的距離約5公分以及電流40A,藉由改變蒸鍍材料純鎂的重量,來比較純鎂薄膜的厚度,由SEM觀察發現,當放入的蒸鍍材料純鎂越多時,所得到的純鎂薄膜越厚。無前處理壓鑄鎂合金具純鎂薄膜做浸置於3.5 wt% NaCl 水溶液中發現,基材和純鎂薄膜之間會有剝離現象,表示兩者間的接合力不佳;經前處理壓鑄鎂合金具薄膜試片做浸置於3.5 wt% NaCl 水溶液發現,基材和純鎂之間不會有剝離現象,表示兩者間的接合力較佳。把試片具純鎂薄膜浸置於3.5 wt% NaCl 水溶液發現,當試片具有越厚的純鎂薄膜,壓鑄鎂合金受到保護的時間就越久。由實驗結果顯示,將3N 純鎂沉積在壓鑄鎂合金上,確實能達到犧牲保護效果。
Abstract The Mg alloys are especially widely used in 3C productions and transportation industries. But the Mg alloys are easily corroded, so they need some appropriate surface processes to enhance the anticorrosive properties. In the research, we coat an 3N Mg film onto the Mg alloy(AZ91D) substrate and by sacrificing Mg film anode for cathodic protection of AZ91D in NaCl solution. In the research, the thermal evaporation technique was used. The substrate was first treated, before vapor deposition. We got the lowest corrosion current density 8μm/cm2 for the sample of acid pickling and surface activation. We coated an 3N Mg film on the AZ91D substrate with different 3N Mg weight in the crucible. By SEM image of the Mg film, we could find that the Mg film was more thickness with 3N Mg weight in the crucible. From immersion test results, we found that Mg film separated from no treatment substrate in NaCl solution. Contrarily, Mg film didn't separate from treatment substrate. The corrosion potential of the Mg film was more anode than that of the AZ91D substrate. Therefore, the uncoated side of the sample with Mg film was observed after corrosion testing to elucidate the effect of an Mg film used as a sacrificial anode to protect AZ91D substrate. As Mg film was more thickness, the AZ91D could be protected for long time.
URI: http://hdl.handle.net/11455/11122
Appears in Collections:材料科學與工程學系

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