鎂鋰合金添加微量元素之微弧陽極處理研究

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高銘辰(Vincent Kao) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

鎂鋰合金添加微量元素之微弧陽極處理研究
(Micro-arc anodizing of magnesium-lithium alloys add rare-earth element)

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摘要(中)

本研究利用微弧陽極處理的方式改善鎂鋰合金系列LAZ1110、LAZ1110+Be、LAZ1110+Sc、LAZ1110+Be+Sc之耐蝕性，並探討其差異性，實驗中利用矽酸鈉(40g/L)、氫氧化鈉(100g/L)、次磷酸鈉(20g/L)、乙二酸(80g/L)之電解液進行陽極處理，然後針對不同材料與時間參數進行探討，由實驗結果顯示，LAZ1110、 LAZ1110+Be、LAZ1110+Sc、LAZ1110+Be+Sc其四種材料所添加之微量元素，其中添加Be元素之LAZ1110+Be為其四種材料中其抗蝕性最差的，而添加Sc元素之LAZ1110+Sc為其四種材料中其抗蝕性最佳的，乃由於添加Be元素具有減少熔融金屬表面的氧化作用，並有阻燃的效果，造成LAZ1110+Be於陽極處理的過程中破壞陽極膜的生成，而Sc原素本身既有增加抗蝕的效果，故LAZ1110+Sc為其四種材料中其抗蝕性最佳的。
陽極膜會因操作溫度、頻率、時間、電流密度、陽極處理液濃度等參數的影響，使陽極膜有不同結構與抗蝕性，本實驗乃利用相同電流密度，相同操作條件，利用不同時間參數找出陽極處理最佳操作條件，實驗結果顯示於8min的操作條件下，陽極膜其抗蝕性為最佳。

摘要(英)

This research tries to improve corrosion resistance of LAZ1110, LAZ1110 +Be, LAZ1110 +Sc, LAZ1110 +Be +Sc magnesium alloys by means of micro-arc anodizing. In the experiment, the electrolytic solution is composed of 40gl-1 Na2SiO3, 100gl-1 NaOH, 20gl-1 NaPO2and 80gl-1(COOH)2.2H2O in distilled water. After the micro-arc anodizing treatment, it will discuss to various parameters.
The results indicated that the anodic oxidation film has better corrosion performance under the pulse current condition. In four materials of LAZ1110, LAZ1110 +Be, LAZ1110 +Sc, LAZ1110 +Be +Sc magnesium alloys, LAZ1110 +Be have the worst of corrosion resistance, and LAZ1110 +Sc have the best of corrosion resistance, in the basic extrapolate, add the Be element have decrease the oxidation on the magnesium alloys surface, this phenomenon destroy the anodic oxidation film of LAZ1110 +Be during micro-arc anodizing treatment, add the Sc element have increase the effect of corrosion resistance.
Temperature, frequency, time, current density, duty cycle and electrolytic concentration have an influence on micro-structure and corrosion performance of anodic films. In our research, it fixed current density and another parameter, and it used various of time parameter to find out the best operate condition, the results indicated that at 8min of operate condition of micro-arc anodizing treatment have the best of anodic oxidation film.

關鍵字(中)

★ 微弧陽極處理
★ 鎂鋰合金

關鍵字(英)

★ magnesium-lithium alloys
★ anodizing

論文目次

中文摘要.................................................I
英文摘要................................................II
誌謝....................................................IV
目錄.....................................................V
圖目錄..................................................XI
表目錄................................................XIII
第一章前言..............................................1
第二章、文獻回顧.........................................6
2.1 鎂及鎂合金的腐蝕特性.................................7
2.1.1鎂的活性............................................7
2.1.2鎂在水溶液之反應....................................9
2.2 環境對鎂合金腐蝕之影響.............................10
2.3 金屬元素對鎂及其合金的影響..........................12
2.4 鎂及其合金之表面耐蝕處理............................18
2.4.1 電鍍與無電鍍......................................18
2.4.2 化成處理..........................................19
2.4.3 氣相沈積法........................................21
2.4.4 鎂合金之微弧陽極處理..............................22
2.4.4.1陽極膜形成機制...................................23
2.4.4.2陽極膜之結構.....................................27
2.4.4.3施加電壓電流對陽極化處理之影響...................28
2.4.4.4電解液之選擇及對陽極膜之影響.....................29
第三章實驗步驟.........................................32
3.1 實驗材料與試片準備..................................32
3.2 陽極化處理程序......................................35
3.3 表面型態以及結構成分分析............................37
3.4 陽極膜耐蝕效果測試..................................38
第四章、結果與討論......................................39
4.1 氫氧化鉀、矽酸鉀陽極處理液配方對陽極膜之影響........39
4.2 矽酸鈉、氫氧化鈉、次磷酸鈉、乙二酸陽極處理液配方對陽極膜之影響................................................49
4.3 矽酸鈉、氫氧化鈉、次磷酸鈉、乙二酸陽極處理液配方之時間參數對陽極膜之影響......................................60
4.3.1表面分析...........................................60
4.3.2 斷面分析..........................................66
4.4電化學極化曲線測試...................................76
4.4.1不同陽極處理液配方.................................76
4.4.2時間參數...........................................81
第五章結論.............................................84
參考文獻................................................87

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指導教授

李雄(Shyong Lee)

審核日期

2008-7-23

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