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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林招松(Chao-Sung Lin) | |
dc.contributor.author | Wei-Jen Li | en |
dc.contributor.author | 李偉任 | zh_TW |
dc.date.accessioned | 2021-06-14T16:57:48Z | - |
dc.date.available | 2013-08-05 | |
dc.date.copyright | 2008-08-05 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-07-30 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/40730 | - |
dc.description.abstract | 本研究於AZ31B鎂合金表面進行硝酸鈰化成處理,探討過氧化氫、前處理、黏度調整和重複浸泡等製程的影響。使用光學顯微鏡(OM)、掃描式電子顯微鏡(SEM)及穿透式電子顯微鏡(TEM)觀察巨觀和微觀顯微結構,並以半定量成份分析(EDX)和擇區繞射分析皮膜成份,搭配化學分析電子光譜儀(ESCA)、低掠角X光繞射儀(GA-XRD)鑑定皮膜組成。以極化曲線、交流阻抗(EIS)分析皮膜抗蝕能力,另以百格試驗評估化成皮膜附著性。
結果顯示硝酸鈰化成皮膜由外至內為髮狀層、緻密層和多孔層,皮膜組成以氫氧化物為主,當化成皮膜脫水時會造成裂紋和缺陷,導致皮膜容易脫落。在化成液中添加過氧化氫可將Ce3+氧化成Ce4+,且溶液pH下降溶氧度上升,化成反應加速,並使皮膜色澤由灰色變成金黃色,皮膜結構由外至內為緻密層和多孔層。但因反應速度增快導致氫氣泡生成加速,在化成期間氣泡脫離表面造成皮膜損傷和剝離。因此在化成液中添加甘油調整劑,可減少化成時氫氣泡生成對皮膜的破壞,以及降低脫水裂紋寬度和連結度。重複浸泡處理可得到最佳化的皮膜,以化成時開路電位為監控標準分隔化成時間,以達到控制化成皮膜厚度和缺陷成長。針對重要製程參數分析並討論化成皮膜成長機制和缺陷成因,在AZ31B鎂合金硝酸鈰化成處理本研究可解決附著性、抗蝕性不佳等缺點。 | zh_TW |
dc.description.abstract | Cerium conversion coating on AZ31B magnesium has been studied, with emphasis on the pretreatment, the addition of hydrogen peroxide, the viscosity of the solution, and the repeated immersion process. The surface morphology of the coating was investigated by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure and thickness of the coating were characterized by cross-sectional transmission electron microscopy (TEM). The composition and phase of the coating were investigated by energy dispersive spectrometry (EDX), x-ray photoelectron spectrometry (XPS), and glancing angle x-ray diffraction (GA-XRD). Moreover, the corrosion resistance of the coating was measured by polarization test and electrochemical impedance spectroscopy (EIS). Finally, the adhesion of the coating was measured by the tape adhesion test according to ASTM D3359-97 standard.
The conversion coating formed in Ce(NO3)3 solution exhibited a three-layered structure: a fibrous major overlay; a compact layer as the immediate layer; and a porous layer directly contacting with the subtracts. The coating was mainly composed of hydroxide, and suffered server cracking and peel off after dehydration. Adding hydrogen peroxide to the Ce(NO3)3 solution changed its color from colorless to orange as Ce3+ was oxidized to Ce4+. Meanwhile, the solution pH decreased to 3 while the dissolved oxygen concentration increased. The addition of hydrogen peroxide accelerated the reaction of coating formation, and the resultant golden coating consisted of a compact outer layer and a porous inner layer. On the other hand, intensive hydrogen bubble evolution during immersion caused blisters and partial peel-off of the coating. To retard the reaction of coating formation, glycerol was added to the Ce(NO3)3/H2O2 solution. The present of glycerol in the solution suppressed the evolution of hydrogen bubbles, and the resultant coating underwent less extents of cracking. A repeated immersion treatment was further employed to improve the adhesion and corrosion resistance of the coating. The improvement was achieved by controlling the thickness and defects of the coating grown during each step of immersion of which the immersion time was chosen based on the open circuit potential of the plate during conversion coating treatment. Finally, the growth and defect formation mechanism of the cerium conversion coating was discussed in detail. | en |
dc.description.provenance | Made available in DSpace on 2021-06-14T16:57:48Z (GMT). No. of bitstreams: 1 ntu-97-D93527010-1.pdf: 16002682 bytes, checksum: a6ccb58ea9b831d343ff6db876d22e83 (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 封面內頁
口試委員會審定書....I 致謝...............II 中文摘要..........III Abstract...........IV 論文目錄...........VI 圖目錄............XII 表目錄..........XXIII 第一章 前言 1 第二章 文獻探討 3 2-1 鎂合金產業的現況 3 2-2 提煉鎂合金的方法 5 2-3 鎂合金製程中的問題和改善的方法 5 2-4 鎂合金表面處理 9 2-4-1陽極氧化處理 9 2-4-2化成處理 12 2-4-3無電鍍處理 13 2-4-4電鍍處理 14 2-4-5原子層沈積法 15 2-4-6其他處理法 15 2-5 化成處理參數 15 2-6 前處理方式 16 2-7 化成溶液的分類 17 2-7-1 鉻系化成處理 18 2-7-2 磷酸/錳酸鹽化成處理 18 2-7-3 稀土鹽類化成處理 19 2-7-5 錫酸鹽化成處理 20 2-7-6 釩酸鹽化成處理 20 2-7-7 酸性和鹼性化成系統的比較 21 2-8 P-B比 22 第三章 實驗方法及步驟 24 3-1 製程說明 24 3-2 材料來源和分析 24 3-3 實驗流程 24 3-4 製程條件 26 3-4-1 過氧化氫的添加 28 3-4-2 鹽酸酸洗前處理 28 3-4-3 調整劑的功用 28 3-4-4 化成時重複浸泡的影響 28 3-5 皮膜微結構分析 29 3-5-1 光學顯微鏡表面形貌觀察 29 3-5-2 掃描式電子顯微鏡觀察和分析 29 3-5-3 橫截面穿透式電子顯微鏡觀察及分析 30 3-6 化成皮膜抗蝕性評估 33 3-6-1 開路電位量測 33 3-6-2 極化曲線量測 33 3-6-3 交流阻抗分析 34 3-7 化成皮膜附著性量測 37 3-8 化成皮膜表面分析 39 3-8-1 化學分析電子光譜 39 3-8-2 低掠角X-ray繞射分析 39 3-8-3 二次離子質譜分析 40 第四章 實驗結果 41 4-1 AZ31B鎂合金底材分析 41 4-1-1 ICP-AES化學成份分析 41 4-1-2 SEM表面形貌觀察 41 4-1-3 橫截面TEM觀察 42 4-1-4 低掠角X-ray繞射分析 43 4-2氧化劑的影響 44 4-2-1 脫水裂紋生成之觀察 45 4-2-2 皮膜色澤觀察 48 4-2-3 SEM表面形貌觀察 48 4-2-4 橫截面TEM觀察 51 4-2-5 皮膜附著性量測 56 4-2-6 電化學量測 57 4-2-6-a 開路電位 57 4-2-6-b 極化曲線和腐蝕破壞形貌 58 4-2-7 XPS化學能譜分析 60 4-2-8 低掠角X-ray繞射分析 65 4-3前處理的影響 66 4-3-1 皮膜色澤觀察 66 4-3-2 SEM表面形貌觀察 67 4-3-3 橫截面TEM觀察 70 4-3-4 皮膜附著性量測 73 4-3-5 電化學量測 74 4-3-6 低掠角X-ray繞射分析 75 4-4 化成溶液黏度的影響 76 4-4-1 開路電位量測 76 4-4-2 皮膜色澤觀察 77 4-4-3 SEM表面形貌觀察 78 4-4-4 橫截面TEM觀察 80 4-4-5 皮膜附著性量測 85 4-4-6 電化學量測 86 4-4-6-a 極化曲線 86 4-4-5-b 交流阻抗分析 87 4-4-7 低掠角X-ray繞射分析 100 4-4-8 二次離子質譜儀分析 101 4-5 重複浸泡製程 104 4-5-1 開路電位量測 105 4-5-2 皮膜色澤觀察 105 4-5-3 SEM表面形貌觀察 106 4-5-4 橫截面TEM觀察 110 4-5-5 皮膜附著性量測 115 4-5-6 電化學量測 116 4-5-6-a 極化曲線 116 4-5-6-b 交流阻抗分析 118 4-5-7低掠角X-ray繞射分析 142 第五章 討論 . 143 5-1過氧化氫的效用 143 5-2鹽酸酸洗前處理的影響 146 5-3 化成溶液黏度的影響 147 5-4 重複浸泡的影響 148 第六章 結論 . 152 參考文獻 . 155 | |
dc.language.iso | zh-TW | |
dc.title | AZ31鎂合金硝酸鈰化成皮膜結構與性質研究 | zh_TW |
dc.title | Microstructure and Properties of Cerium Nitrate Conversion Coating on AZ31 Magnesium alloy | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 林新智(Hsin-Chih Lin),楊木榮(Mu-Rong Yang),黃清安(Ching-An Huang),葛明德(Ming-Der Ger),汪俊延(Jun-Yen Uan) | |
dc.subject.keyword | 硝酸鈰化成處理,橫截面穿透式電子顯微鏡觀察,極化曲線,交流阻抗,百格試驗, | zh_TW |
dc.subject.keyword | Cerium nitrate conversion coating treatment,Cross-sectional TEM,Polarization curve,Electrochemical impedance spectroscopy,Adhesion test, | en |
dc.relation.page | 161 | |
dc.rights.note | 有償授權 | |
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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