臺灣博碩士論文加值系統

鎂合金具有良好的物理特性為新一代之綠色材料，卻因為較差的物理、化學特性造成抗腐蝕與耐磨耗性較差，進而嚴重影響鎂合金之未來發展。微弧氧化技術為表面改質新興技術之一，其技術特色在於生成氧化膜於閥金屬(valve metal)如鎂、鋁、鈦之表面，並提升其抗腐蝕和耐磨耗特性。本次研究藉由AZ31 鎂合金在電解液之中添加不同奈米顆粒和氧化時間以達到氧化膜性質變化，其電解液主軸以矽酸鹽
為主。此外使用奈米顆粒以助於提升氧化膜耐磨耗、抗腐蝕等特性。透過SEM、XRD、EDS 和三極電化學試驗等方式以分析不同微弧氧化之表面形貌、鍍膜厚度、抗腐蝕性之差異化。
由實驗得知，隨著微弧氧化時間增長，氧化膜之厚度與孔洞大小也隨之成長。透過添加奈米顆粒使其與氧化膜結合及填補表面之孔洞，進而提升氧化膜之硬度。添加WS2 奈米顆粒之氧化膜具有較優異的硬度，與添加氧化鋁(Al2O3)奈米顆粒之氧化膜比較起來卻無較佳之抗腐蝕能力。氧化膜的厚度、表面形貌、緻密性和組成皆為影響抗腐蝕能力的因素。

Magnesium alloy has good mechanic properties and is considered the green material of the era. However, poor corrosion and wear properties limit its application. Micro-arc oxidation is one of the latest surface treatment technologies forming ceramic-like oxide coating on valve meta such as magnesium, aluminum, and titanium. This coating enhances anti-corrosion and wear ability remarkably.
This study is focusing on the effects of various nanoparticles and the duration time in silicon electrolyte of MAO coatings and of AZ31 magnesium alloy when evaluated. The SEM, XRD, EDS, and polarization curve to exam and analyze the MAO surface morphologies, coating layer, and corrosion properties.
Thickness and pore size of oxidation film increase as the duration extends. The mechanical properties enhanced when added nanoparticles into electrolyte bound with oxidation film and filled up pores on the surface. The results have shown that oxidation film with IF-WS2 has better mechanical properties (hardness), however, compared against oxidation film with Al2O3 nanoparticles it has poor anti-corrosion abilities. Thickness, surface appearance, density, structure and composition of the oxidation layer may affect its anti-corrosion ability.

第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.2.1 微弧氧化技術之簡介 2
1.2.2 影響樣化陶瓷膜生成之參數介紹 3
1.2.2.1 電流密度 4
1.2.2.2 電壓 7
1.2.2.3 脈衝頻率 9
1.2.2.4 放電時間 10
1.2.2.5 占空比 11
1.2.2.6 電解液配方 14
1.2.2.7 添加物 17
1.2.3 無機奈米顆粒 20
1.2.4 複合電鍍 20
1.3 文獻整理心得 21
1.4 研究動機與目的 22
第二章 研究理論基礎 23
2.1 鎂合金之簡介 23
2.1.1 鎂之基本性質 23
2.1.2 鎂合金 25
2.1.3 合金元素對鎂合金之影響 26
2.2 鎂的腐蝕電化學 28
2.2.1 腐蝕的定義 29
2.2.2 影響鎂腐蝕的因素 30
2.3 鎂合金表面處理技術 33
2.3.1 機械表面處理 34
2.3.2 化成處理 34
2.3.3 電子束合金化處理 36
2.3.4 雷射合金化處理 37
2.3.5 物理氣相沉積法 37
2.3.6 化學氣相沉積法 39
2.3.7 無電鍍表面處理 39
2.3.8 電鍍 40
2.3.9 陽極處理 40
2.4 微弧氧化技術之介紹 41
2.4.1 微弧氧化技術發展 42
2.4.2 微弧放電工作原理 43
2.4.3 影響膜層特性之控制因子 47
2.5複合電鍍之機制 48
第三章 實驗方法與步驟 50
3.1 實驗流程 50
3.2 試片製備 50
3.3 微弧氧化步驟及參數 51
3.4 陶瓷氧化層宏觀分析 53
3.4.1 粗糙鍍分析 55
3.5 微觀結構觀察分析 57
3.5.1 SEM顯微組織觀察 57
3.5.2 XRD繞射分析 57
3.6 機械性質分析 58
3.6.1 維氏硬度 58
3.6.2 奈米壓痕 59
3.7 腐蝕分析 61
3.7.1 極化曲線分析 61
第四章 結果與討論 63
4.1 電壓與氧化時間曲線 63
4.2 表面粗糙度 66
4.3 微觀結構 69
4.4 成分分析 92
4.4.1 XRD 92
4.5 機械性質分析 94
4.5.1 維氏硬度 94
4.5.2 奈米壓痕 95
4.6 腐蝕分析 99
4.6.1 極化曲線 99
4.7 添加Al2O3與WS2奈米顆粒之結果比較 104
第五章 結論 105
參考文獻 106

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