臺灣博碩士論文加值系統

鎂鋰合金(LZ91)目前為實用金屬中最輕者，其優點有質量輕(類似塑膠)、較高強度與比剛性和較佳的散熱性等優點，但是鎂鋰合金極容易受到腐蝕，這嚴重影響它在實際生活的應用。本研究採用濕式法製程中的微弧氧化，製備一層具有高耐蝕性之氧化膜以提升其耐蝕性，經過微弧氧化處理的鎂鋰合金表面為氧化層視覺上較不美觀，且其表面不具導電性，因此在微弧氧化層上披覆鎳磷層，但是微弧氧化層不具任何活性，須將其浸泡在具有催化活性的溶液中，因此能讓鎳離子藉由催化而均勻的塗覆在微弧氧化的鎂合金上，以提升實用性與美觀性。
首先探討不同微弧電壓對微弧氧化層耐蝕性的影響，找出最佳操作條件後，再探討不同觸媒的特性及披覆於最佳條件微弧氧化層上之影響，最後以化學鍍方式披覆鎳磷層，觀察其耐蝕性之影響。實驗中以SEM觀察其表面形貌及橫截面形貌，電化學試驗線性極化曲線、鹽霧試驗檢測其鍍層耐蝕性，使用光散射儀器分析觸媒粒徑大小，穩定性分析儀檢測觸媒之穩定性，接觸角分析儀器來分析觸媒與微弧氧化層之間的親和性。由結果得知，以雙極脈衝電壓400V時，能製備平整且緻密的氧化層，其耐蝕性較佳，在耐腐蝕測試中，電化學試驗得到腐蝕電流為1.4×10-7 A/cm2，鹽霧測試可通過48 小時無任何鏽點與變色。以不同觸媒披覆於最佳微弧氧化層上，由結果得知pH7的N型觸媒有較佳的表現，其有效粒徑大小為最小，穩定性較佳，與微弧氧化層之間親和性最佳以及對微弧氧化層的耐蝕性影響較小，後續以化學鍍方式披覆鎳磷層時，其鎳磷鍍層可通過24小時鹽霧，為最佳製程條件。

Magnesium-lithium alloy(LZ91) is currently the lightest of practical metal, its advantages are light (similar to plastic), higher strength, specific rigidity and better heat dissipation. Magnesium alloy is extremely to corrosion which seriously affecting its application in real life. In this study, Micro - arc oxidation of wet - type method was used to prepare a oxide film on magnesium alloy which improves corrosion resistance. The surface of the magnesium-lithium alloy treated by micro-arc oxidation was not beautiful. In corrosive environment, the outside layer is prone to failure. In order to solve this problem, the outer layer of oxide film to seal, which can prevent corrosion factor invasion. The oxide layer is without any activity, which needs to soak in catalytic active solution, therefore nickel ions can be catalyzed and evenly coated on the micro-arc oxidation of magnesium alloy to enhance the corrosion resistance and aesthetics.
First discussion different voltage on corrosion resistance of micro-arc oxidation layer. After finding the best operating conditions, and then explore the characteristics of different catalysts and the effect of coating on the best conditions of micro - arc oxidation. Finally, the micro-arc magnesium oxide alloy with different catalyst was coated with nickel-phosphorus layer by electroless plating, and observe the corrosion resistance. In the experiment, the surface morphology and cross-sectional were observed by scanning electron microscopy(SEM). Electrochemical test linear polarization curve and salt spray to detect the corrosion resistance. The size of the catalyst particles is analyzed by a light scattering instrument. Catalyst stability is analyzed by stability analysis instrument. Contact angle analysis instrument analyzes the affinity between the catalyst and the micro-arc oxidation layer.

The experimental results show that: the flat and dense oxide layer was prepared at a Bipolar pulses voltage of 400 V, which corrosion resistance is better. In the corrosion resistance test, the electrochemical test obtained corrosion current of 1.4 × 10-7 A / cm2, salt spray test can be passed 48 hours. Next, with different catalyst on the best micro-arc oxidation layer. The results show that the pH value of the 7 N type catalyst has a better performance. Its effective particle size is the smallest, the stability is better. The affinity with the micro-arc oxide layer is best and the corrosion resistance to the micro-arc oxide layer is less affected. Subsequent to electroless nickel-phosphorus layer, which can pass salt spray 24 hours . It is the best process conditions.

目錄

誌謝
摘要
ABSTRACT
目錄
表目錄
圖目錄
1.緒論
1.1.前言
1.2.研究動機與目的
2.文獻回顧與理論基礎
2.1.鎂合金的簡介
2.2.鎂合金之分類
2.3.鎂合金基本腐蝕性質
2.4.鎂合金表面處理技術之介紹
2.5.鎂合金微弧氧化的技術及發展
2.6.化學鍍法
2.6.1.化學鍍鎳基的沿用和發展
2.6.2.化學鍍Ni-P的反應機構
2.7.腐蝕機構原理
2.7.1.動電位極化曲線
3.實驗方法
3.1.微弧氧化製程
3.1.1.試片前處理與鍍液的配製
3.1.2.微弧氧化處理
3.2.觸媒製程
3.3.金屬化製程
3.3.1.試片前處理與鍍液的配製
3.3.2.金屬化處理
3.4.分析與檢測
3.4.1.粒徑大小分析
3.4.2.接觸角分析
3.4.3.穩定性檢測
3.4.4.表面形貌觀察
3.4.5.橫截面及厚度觀察
3.4.7.耐蝕性分析
4.結果與討論
4.1.不同電壓對LZ91微弧氧化層之影響
4.1.1.表面形貌與橫截面之觀察
4.1.2.極化曲線量測
4.1.3.鹽霧試驗
4.1.4.孔洞大小與數量之統計
4.2.不同觸媒條件對LZ91微弧氧化層之影響
4.2.1.酸性觸媒(pH=3)
4.2.1.1.粒徑大小分析
4.2.1.2.接觸角量測
4.2.1.3.穩定性分析
4.2.1.4.SEM表面形貌觀察
4.2.1.5.極化曲線量測
4.2.1.6.鹽霧試驗
4.2.2.中性觸媒酸(pH=7)
4.2.2.1.粒徑大小分析
4.2.2.2.接觸角量測
4.2.2.3.穩定性分析
4.2.2.4.SEM表面形貌觀察
4.2.2.5.極化曲線量測
4.2.2.6.鹽霧試驗
4.3.LZ91微弧氧化層披覆化學鍍鎳磷之特性研究
4.3.1.表面形貌與橫截面之觀察
4.3.2.極化曲線量測
4.3.3.鹽霧試驗
4.4.反應機制探討
4.4.1.微弧氧化層之形成機制
4.4.2.微弧氧化層塗覆觸媒之示意圖
4.4.3.化學鍍鎳磷之腐蝕機制
5.結論
6.未來研究方向
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