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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林招松 | |
dc.contributor.author | Li-Der Liu | en |
dc.contributor.author | 劉立德 | zh_TW |
dc.date.accessioned | 2021-06-08T07:14:37Z | - |
dc.date.copyright | 2008-08-05 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-07-28 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/26547 | - |
dc.description.abstract | 本研究藉由處理液成份與條件、皮膜微結構與成份、皮膜抗蝕性之間關係的建立探討環保型含矽酸根鹼性陽極處理系統處理液成份與條件的影響以及氟離子在此系統中的重要性。陽極氧化的製程使用了壓鑄型AZ31鎂合金。微結構觀察及皮膜特性分析方面使用了OM和SEM觀察試片表面,並製作橫截面試片,以TEM觀察皮膜厚度和結構。化學組成及結晶性則搭配GA-XRD、SAD、和XPS的分析結果。抗蝕性由極化曲線和鹽水浸泡來量測皮膜。結果發現氟離子,但不為獨氟離子,可促使微弧放電。電解液KOH的濃度則可以使皮膜的構成與結晶性改變,直接影響到腐蝕的行為與防腐蝕性能。最後在最佳防腐性能之標準試樣的TEM微結構分析得知介面阻障層(barrier layer)的生成與氟離子使其致密化的效應。 | zh_TW |
dc.description.abstract | In this study, electrolyte parameters, coating microstructure, and corrosion behavior of AZ31 anodized in alkaline silicate solutions are established and the importance of fluoride is discussed. Microstructural characterization used optical microscope (OM) and scanning electron microscope (SEM) for surface morphology. Cross-sectional microstructures were observed with transmission electron microscope (TEM). In chemical analyses, glancing angle X-ray diffraction (GA-XRD), TEM paired selected area diffraction (SAD), and X-ray photoelectron spectroscopy (XPS) techniques were used. Finally, corrosion behaviors were evaluated with potential polarization curves and salt immersion tests (SIT). Results showed silicate alone, when added to KOH in sufficient amounts is capable of inducing sparks without addition of fluoride. The KOH concentration can alter the coating composition and crystallinity, directly affecting the corrosion behavior and protective properties of the anodic coating. On the cross-sectional observation of reference samples anodized in alkaline silicate solutions, fluoride was found to contribute to the densification of a critical dielectric barrier layer. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T07:14:37Z (GMT). No. of bitstreams: 1 ntu-97-R95527063-1.pdf: 6818741 bytes, checksum: d22ffcc74ee0fef0317ceeea06ded5bc (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 1. Introduction 1
2. Literature Review 5 2.1 Magnesium 5 2.1.1 Applications 8 2.1.2 Corrosion Properties 10 2.2 Magnesium Surface Treatments 14 2.2.1 Conversion Coating 15 2.2.2 Anodization 16 2.2.2.1 Plasma Electrolytic Reaction 21 2.2.2.2 Alkaline Silicate Systems 25 3. Experimental 31 3.1 Anodization 33 3.1.1 Material Preparation 33 3.1.2 Anodization Setup 33 3.1.3 Anodization Procedure 34 3.2 Microstructural Characterization 35 3.2.1 Optical Images 36 3.2.2 Scanning Electron Microscopy 36 3.2.3 Transmission Electron Microscopy 38 3.2.4 X-Ray Diffraction 40 3.2.5 X-Ray Photoelectron Spectroscopy 40 3.3 Corrosion Behavior 41 4. Results 43 4.1 pH and Solution Conductivities 43 4.2 Voltage-Time Curves and Sparking Behavior 45 4.2.1 Evolution 45 4.2.2 Arcing Effect 48 4.2.3 KOH concentration: R 50 4.2.4 KOH concentration: NSs 52 4.2.5 KOH concentration: NFs 53 4.2.6 KOH concentration: KOH 54 4.2.7 Concentration: NS51s 56 4.2.8 Concentration: NS115s 58 4.2.9 Concentration: NFs 58 4.2.10 0.11 M KOH Based Systems 61 4.2.11 0.85 M KOH Based Systems 61 4.2.12 Mole Ratio, KOH:KF at 0.11 M KOH Based Solutions 63 4.2.13 Mole Ratio, KOH:KF at 0.85 M KOH Based Solutions 63 4.2.14 Mole Ratio, KOH:Silicate at 0.85 M KOH Based Solutions 64 4.2.15 Silicate Content 64 4.2.16 Sodium Citrate 66 4.2.17 Current Density 66 4.2.18 Bath Temperature 67 4.3 Microstructural Characterization 68 4.3.1 SEM Surface Morphology 72 4.3.2 TEM Cross-sectional Microstructures 79 4.3.3 Glancing-Angle XRD Crystallinity Analysis 84 4.4 XPS Chemical Analysis 91 4.5 Corrosion Measurements 94 4.5.1 Polarization Curves 94 4.5.2 Salt Immersion Test 98 5. Discussion 101 5.1 Anodizing Solution 101 5.1.1 pH and Solution Conductivity 101 5.1.2 Effect of Solution Constituents 103 5.2 Coating Evolution 104 5.2.1 The Barrier Layer 105 5.3 Defect and Crystallinity 108 5.4 Corrosion Behavior 111 6. Conclusion 113 7. Reference 115 | |
dc.language.iso | en | |
dc.title | AZ31鎂合金環保型含矽酸根鹼性陽極處理研究 | zh_TW |
dc.title | Anodization of AZ31 Magnesium Alloy in Alkaline Silicate Electrolyte – Electrolyte Constituent in Environmental Processes | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蔡文達,楊聰仁,林景崎,葛明德 | |
dc.subject.keyword | 含矽酸根鹼性陽極處理系統,氟離子,barrier layer,TEM, | zh_TW |
dc.subject.keyword | Alkaline silicate anodization system,fluoride,barrier layer,TEM, | en |
dc.relation.page | 119 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2008-07-30 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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