臺灣博碩士論文加值系統

本實驗探討經摩擦攪拌製程(FSP)改質後對於AZ91D鎂合金添加Ce與La稀土合金元素的微觀組織、相組成、表面形貌及在NaCl溶液環境下之抗腐蝕能力。本實驗結果顯示出，AZ4Ce與AZ4La在經FSP後有助於β相均勻分散固溶入α相裡，且添加Ce與La稀土元素有利於晶粒的細化，使得硬度值的提升；於XRD分析發現AZ4Ce與AZ4La經FSP後有助於優選方位的改變。而從電化學分析中，在動電位極化曲線及交流阻抗結果發現AZ4Ce與AZ4La經FSP後，兩者抗腐蝕能力都有明顯的提升，且於AZ4La經FSP後有更好的抗腐蝕能力，而在氫氣泡收集結果發現到經FSP後有大幅減少氫氣的析出，且表面形貌特徵則有應力腐蝕裂縫(SCC)的產生。

The aim of present study is to investigate the effect of friction stir processing (FSP) on microstructure features, phase compositions, corrosion morphologies and anti-corrosion performances in a NaCl solution of the AZ91D alloy with adding Ce and La rare earth elements. Experimental results show that the γ-Mg17Al12 of AZ4Ce and AZ4La alloys can be uniformly dispersed and partially solid-soluted into the α-Mg through the FSP modification process. In addition, the addition of Ce and La elements can help to refine grains and the microhardness is also increased. The preferred orientations of AZ4Ce and AZ4La alloys is changed after the FSP. According to the polarization curves and EIS analysis results, the electrochemical anti-corrosion performances of AZ4Ce and AZ4La alloys are significant improved after the FSP modification. Moreover, the precipitation of hydrogen bubbles from AZ4Ce and AZ4La alloys is obviously reduced after the FSP. However, the stress corrosion cracking (SCC) is observed on the surface of FSP-modified specimens.

摘要.....i
Abstract.....ii
誌謝.....iii
目錄.....iv
表目錄.....vi
圖目錄.....vii
第一章 前言.....1
第二章 文獻探討.....2
2-1 鎂合金的基本特性與分類符號.....2
2-2 鎂合金常見之添加合金元素.....2
2-3 鎂合金添加稀土元素之研究.....3
2-4 摩擦攪拌銲接/摩擦攪拌改質製程.....4
2-5 鎂合金之電化學特性及腐蝕機構.....6
2-5-1 鎂的電化學特性.....6
2-5-2 開路電位與動電位極化曲線.....7
2-5-3 交流阻抗.....8
第三章 實驗內容與方法.....18
3-1 實驗材料製備與成分分析.....18
3-2 摩擦攪拌改質製程(FSP).....18
3-3 微觀組織解析.....18
3-3-1 光學顯微鏡(OM)之金相組織觀察.....18
3-3-2 掃描式電子顯微鏡(SEM)及能量散射光譜儀(EDS)分析.....18
3-3-3 高解析電子微探儀(EPMA).....19
3-4 X-ray繞射相組成與極圖分析(XRD & Pole figure).....19
3-5 微硬度試驗(Vickers hardness test).....19
3-6 電化學抗腐蝕試驗.....20
3-6-1 開路電位(OCP).....20
3-6-2 動電位極化曲線試驗(LPR).....20
3-6-3 交流阻抗(EIS).....20
3-6-4 氫氣泡收集.....21
第四章 實驗結果與討論.....29
4-1 微觀組織解析.....29
4-1-1 金相微觀組織觀察(OM).....29
4-1-2 掃描式電子顯微鏡(SEM)及能量散射光譜儀(EDS).....29
4-1-3 高解析電子微探儀(EPMA).....30
4-2 X-ray繞射分析(XRD).....31
4-3 極圖(Pole figure).....31
4-4 維式硬度試驗(Vickers hardness test).....32
4-5 電化學之抗腐蝕分析.....32
4-5-1 開路電位(OCP).....32
4-5-2 線性極化曲線(LPR).....33
4-5-3 交流阻抗(EIS).....34
4-5-4 氫氣泡收集.....35
4-5-5 腐蝕表面與剖面形貌觀察.....35
第五章 結論.....86
參考文獻.....87

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