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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林新智 | |
dc.contributor.author | Yu-Siang Wu | en |
dc.contributor.author | 吳宇翔 | zh_TW |
dc.date.accessioned | 2021-07-10T21:32:59Z | - |
dc.date.available | 2021-07-10T21:32:59Z | - |
dc.date.copyright | 2017-08-29 | |
dc.date.issued | 2017 | |
dc.date.submitted | 2017-07-25 | |
dc.identifier.citation | 1. C. Berry, A Closer Look at Magnesium. The Disruptive Discoveries Journal, 2015, 1-19
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76563 | - |
dc.description.abstract | 鎂合金在輕量化的世代中擁有良好的發揮空間,但其耐磨耗性質不佳與抗蝕能力差是其應用上的缺點。透過微弧氧化的方式,能夠使鎂合金表面形成一層陶瓷氧化膜層,此膜層能夠提供鎂合金良好的耐磨耗性以及保護鎂合金基材減緩腐蝕的速率。
本研究透過調整微弧氧化製程當中氫氧化鈉、偏矽酸鈉、氟化鈉以及硫酸銅的濃度與使用不同的電流密度及工作頻率,在AZ31鎂合金上探討不同因子對膜層結構以及性質的影響。在分析方面利用掃描式電子顯微鏡、X光繞射儀以及X光光電子光譜儀了解膜層的結構以及成分;利用動電位極化曲線了解膜層的抗蝕能力,並透過分光色差儀量化膜層的外觀顏色數值。 研究結果指出,不同電解質上的濃度調整大多數均會影響膜層的結構以及成分,但經由微弧氧化製程後膜層均對鎂合金產生良好的保護性。影響膜層外層結構最明顯的電解質為氫氧化鈉,這是由於其影響電解液中導電度甚劇,使微弧氧化的放電程度有明顯的變化。影響膜層與基材間緻密層最多的電解質是氟化鈉,溶液中是否含有氟化鈉影響此層結構是否存在,也主導了膜層的抗腐蝕能力,但在過多的氟化鈉添加則會造成部分膜層的劣化情形。影響膜層外觀顏色最多的則是硫酸銅,且硫酸銅添加並不影響膜層中的其他性質。而電參數的控制以電流密度以及頻率為主,可以發現電流密度由於影響到提供微弧氧化進行的能量,與膜層厚度有很明顯的正相關;頻率雖然也影響厚度,但其效應不若電流密度來的明顯,其主要能改善膜層的結構,使膜層中的缺陷減少,並使膜層外觀的顏色更加均勻。 | zh_TW |
dc.description.abstract | Magnesium alloys are widely applied in the lightweight field, but it faces two problems those are poor wear resistance and corrosion resistance. Magnesium alloys can be treated to generate ceramic-like oxide coatings on its surface with micro-arc oxidation (MAO). The MAO coating can improve the wear resistance and reduce the corrosion rate of magnesium alloys.
During the micro arc oxidation process in the present study, the concentrations of sodium hydroxide, sodium metasilicate, sodium fluoride, copper sulfate and the applied current density and frequency were carefully controlled. Then, the influences of these controlled parameters on the structures and properties of the MAO coatings on AZ31 magnesium alloy were discussed. In order to understand the microstructures and compositions of MAO coatings, the Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) were applied in this study. Furthermore, to analyze the corrosion resistance and to define the color of MAO coatings, the potentio-dynamic polarization test and colorimeter were applied respectively. Experimental results indicate that the concentration adjustment of electrolytes will affect the structures and compositions of MAO coatings. All these MAO coatings on magnesium alloys can exhibit good surface protection. Sodium hydroxide has the most significant effect on the outer layer of the MAO coatings because it dramatically influences the conductivity of solution which apparently changes the intensity of spark during MAO process. On the other hand, sodium fluoride has the most obvious effect on the inner layer of the coatings and the corrosion resistance because it determinates whether the dense layer exists or not. But, excess sodium fluoride will interrupt the integrity of MAO coatings. Copper sulfate influences the surface colors the most without changing other properties of MAO coatings. The main electric parameters are the current density and frequency. The current density has pronounced influence on the thickness of MAO coating because it can supply different amounts of energy during MAO process. Frequency can have more obvious effect on the microstructures of MAO coatings, instead of the thickness. Its main effect is to improve the microstructure by reducing the defects within MAO coatings, hence improve the homogeneity of surface colors. | en |
dc.description.provenance | Made available in DSpace on 2021-07-10T21:32:59Z (GMT). No. of bitstreams: 1 ntu-106-R04527048-1.pdf: 7027161 bytes, checksum: ec9cffa1c8842d74bbe81cfe4b5238fb (MD5) Previous issue date: 2017 | en |
dc.description.tableofcontents | 致謝 I
摘要 II Abstract III 目錄 V 圖目錄 VII 表目錄 XII 第一章 前言 1 第二章 文獻回顧 3 2.1 鎂與鎂合金 3 2.1.1 常見鎂合金系統 3 2.1.2 鎂合金之腐蝕行為 7 2.1.3 負偏差效應 16 2.2 微弧氧化 21 2.2.1 微弧氧化原理 22 2.2.2 微弧氧化放電特性 23 2.2.3 微弧氧化膜層成長機制 27 2.2.4 微弧氧化膜層結構 33 2.2.5 製程參數的影響 37 2.2.6 微弧氧化著色因素 46 第三章 實驗方法 48 3.1 實驗流程 48 3.2 試片製備 49 3.3 微弧氧化設備與製程 51 3.4 微弧氧化膜層巨觀分析 53 3.4.1 色度分析 (Colorimeter) 53 3.4.2 膜厚測試 (Coating thickness gages) 54 3.5 微觀結構與成份分析 54 3.5.1 掃描式電子顯微鏡 (Scanning Electron Microscopy, SEM) 54 3.5.2 電子探針微分析儀(Electron Probe X-ray Micro-Analyzer, EPMA) 55 3.5.3 X光光電子能譜儀(X-ray photoelectron Spectroscopy, XPS) 55 3.5.4 X光繞射分析(X-ray Diffraction, XRD) 56 3.6 腐蝕性質分析 56 3.6.1 動電位極化曲線(Potentiodynamic Polarization Test) 56 第四章 結果與討論 58 4.1 電解液因素試驗 58 4.1.1 氫氧化鈉濃度之影響 58 4.1.2 偏矽酸鈉濃度之影響 65 4.1.3 氟化鈉濃度之影響 71 4.1.4 硫酸銅濃度之影響 79 4.2 電參數因素試驗 83 4.2.1 電流密度之效應 83 4.2.2 頻率之效應 90 第五章 結論 99 參考文獻 101 | |
dc.language.iso | zh-TW | |
dc.title | 微弧氧化製程之電解液濃度與電參數對於AZ31鎂合金深色膜層性質之影響 | zh_TW |
dc.title | Effect of Electrolyte Concentration and Electrical Parameters on Coating Properties of Dark Micro-Arc Oxidation on AZ31 Magnesium Alloy | en |
dc.type | Thesis | |
dc.date.schoolyear | 105-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 周棟勝,楊木榮,洪衛朋 | |
dc.subject.keyword | AZ31,微弧氧化,電化學,微觀結構, | zh_TW |
dc.subject.keyword | AZ31,Micro-arc oxidation,Electrochemistry,Microstructure, | en |
dc.relation.page | 112 | |
dc.identifier.doi | 10.6342/NTU201701955 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2017-07-26 | |
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 |
文件中的檔案:
檔案 | 大小 | 格式 | |
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ntu-106-R04527048-1.pdf 目前未授權公開取用 | 6.86 MB | Adobe PDF |
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