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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 | Tzu-Chin Yang | en |
dc.contributor.author | 楊子勤 | zh_TW |
dc.date.accessioned | 2021-07-11T15:45:39Z | - |
dc.date.available | 2021-08-21 | |
dc.date.copyright | 2018-08-21 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2018-08-08 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79121 | - |
dc.description.abstract | 熱浸鍍鋅鋼板利用表面鍍鋅層,提供鋼材障蔽保護及犧牲陽極保護的效果,為目前鋼鐵材料常見之表面處理。而在熱衝壓製程應用中,於沃斯田體化處理時,熱浸鍍鋅鋼板面臨嚴重的液態鋅脆化及高溫氧化問題,大幅限制其在熱衝壓製程之應用。
本研究將商用熱浸鍍鋅鋼板以硝酸鋁水溶液進行前處理,利用GPTMS及TEOS作為前驅物,化合成凝膠溶膠矽烷化合物,再以沉浸塗佈法進行鈍化處理,提供其一層具有良好抗高溫氧化能力的二氧化矽鈍化皮膜。探討硝酸鋁前處理以及矽烷鈍化處理對於熱浸鍍鋅鋼板抗高溫氧化之效果、構築矽烷鈍化皮膜表面裂紋以及氧化物生成機制並討論其對於後續磷酸鹽處理之影響。 首先,針對硝酸鋁前處理,由AES實驗結果及SEM橫截面影像可以得知,硝酸鋁前處理具有表面均質化及氧化層增厚之效果,並且會在表面生成一層氧化鋁。而另一方面,接觸角量測結果顯示前處理對於鍍鋅鋼板表面氫氧鍵數目並沒有明顯的影響。 針對皮膜抗高溫氧化的部分,SEM表面形貌以及XRD繞射分析結果顯示矽烷鈍化皮膜可以有效抑制高溫氧化行為並保留較多鐵鋅介金屬相於合金層中。而SEM橫截面以及TGA熱重分析結果則是證明AlS皮膜具有最佳的抗高溫氧化效果。此外,由化學剝除法以及ICP成分分析結果可以得知,硝酸鋁前處理對於金屬鋅的保留有明顯助益。 本研究也對AlS鈍化皮膜表面裂紋及氧化物生成機制進行討論。在沃斯田體化處理一開始升溫到500至600℃時,由於金屬液化進而導致矽烷皮膜破裂,而在表面裂紋處會有氧化鋁層生成,該氧化鋁層可以防止底材更進一步的氧化。在後續升溫至900℃的過程中,氧化鋁層受到應力作用而在表面生成特殊成長方向的氧化物。此外,表面裂紋以及矽烷皮膜交界處會提供快速擴散路徑,後續氧化行為會傾向在該區發生。而矽烷皮膜披覆處在表面以及皮膜內部都可以觀測到氧化物顆粒,代表該區域仍有氧化行為發生。最後,磷酸鹽處理後的SEM表面形貌顯示氧化鋁以及二氧化矽皮膜會阻礙磷化反應進行,故磷酸鋅會傾向從表面氧化物顆粒的邊緣開始成長。 | zh_TW |
dc.description.abstract | Hot-dip galvanizing is one of the common methods for anti-corrosion treatments on steels nowadays. However, liquid metal induced embrittlement and high temperature oxidation occur during the austenitization treatment of hot-dip galvanized press hardening steel. The present study focused on the effect of aluminum nitrate pre-treatment on the properties of the subsequent silica coating formed via sol-gel route. The high temperature oxidation resistance was evaluated using the thermal gravimetric analysis and the microstructural evolution was followed during austenitization. Besides, chemical stripping analysis and ICP were applied to estimate the amount of residual Zn in the intermetallic layer. Experimental results showed that silica coating with pre-treatment had better high temperature oxidation resistance and retained more Zn. The Auger spectroscopy analysis further revealed that the surface of hot-dip Zn coating became chemically homogeneous after the aluminum nitrate pre-treatment, signifying the necessity of a homogeneous aluminum hydroxide surface layer to enhance the adhesion and oxidation resistance of the silica coating on hot-dip galvanized steel during austenitization. In the end, the mechanism of oxidation and crack formation about AlS coating has been built. In addition, the influence of silica coating and surface oxide on subsequent phosphate treatment has been discussed. | en |
dc.description.provenance | Made available in DSpace on 2021-07-11T15:45:39Z (GMT). No. of bitstreams: 1 ntu-107-R05527054-1.pdf: 6929155 bytes, checksum: 032b28ae5b81e1a1780489824ff496d5 (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 論文口試委員審定書 i
中文摘要 ii 英文摘要 iv 總目錄 v 圖目錄 viii 表目錄 xii 第一章 緒論 1 第二章 文獻回顧 2 2.1 次世代先進超高強度熱衝壓鋼材 2 2.1.1 熱衝壓製程 2 2.1.2 不同鍍層系統於熱衝壓鋼材的應用 4 2.2 鍍鋅底材及其高溫腐蝕 8 2.2.1 熱浸鍍鋅製程 8 2.2.2 熱浸鍍鋅於熱衝壓製程上面臨的問題 10 2.3 金屬與合金的高溫腐蝕 17 2.3.1 金屬高溫氧化的熱力學基礎 17 2.3.2 金屬與合金氧化膜生成機制 19 2.3.3 Pilling-Bedworth ratio 21 2.3.4 高溫氧化動力學 22 2.4 熱浸鍍鋅抗高溫氧化鍍層 24 2.4.1 鈍化處理製程 25 2.4.2 溶膠凝膠法 26 2.4.3 磷酸鹽鈍化處理 34 2.4.4 電著塗裝 37 2.5 沉浸塗佈法 38 2.6 電化學剝除法 41 第三章 實驗方法及步驟 42 3.1 實驗方法及流程 42 3.1.1 實驗方法 42 3.1.2 實驗流程 43 3.2 實驗材料及藥品 44 3.2.1 熱浸鍍鋅鋼板 44 3.2.2 矽烷化合物前驅物 44 3.2.3 化學藥品 45 3.3 實驗步驟 45 3.3.1 溶液配置 45 3.3.2 硝酸鋁前處理及矽烷鈍化處理 46 3.3.3 沃斯田體化處理 47 3.3.4 磷酸鹽鈍化處理 48 3.4 微結構觀察及成分分析 48 3.4.1 掃描式電子顯微鏡 48 3.4.2 X光繞射分析 48 3.4.3 歐傑電子能譜儀分析 49 3.4.4 聚焦離子束與電子束顯微系統 49 3.4.5 穿透式電子顯微鏡 50 3.5 表面接觸角量測 51 3.6 皮膜抗高溫氧化及殘留鋅量之定量分析 52 3.6.1 熱重量變化分析儀 52 3.6.2 化學剝除法 52 3.6.3 感應耦合電漿質譜分析儀 53 第四章 實驗結果與討論 54 4.1 硝酸鋁前處理分析 54 4.1.1 AES表面成分分布以及氧化層量測 56 4.1.2 FIB橫截面結果 58 4.1.3 表面親水性分析 59 4.2 硝酸鋁前處理及矽烷鈍化皮膜之抗高溫氧化效果 61 4.2.1 表面影像分析 62 4.2.2 SEM表面形貌觀測 63 4.2.3 XRD繞射分析 66 4.2.4 橫截面SEM觀測 68 4.2.5 熱重量變化分析 69 4.2.6 化學剝除法及ICP定量分析 70 4.3 AlS皮膜裂紋生成以及氧化機制 74 4.3.1 AlS鈍化皮膜披覆區域 75 4.3.2 皮膜表面裂紋區域 78 4.3.3 表面劇烈氧化區域 80 4.4 矽烷鈍化皮膜對磷酸鹽處理之影響 86 第五章 結論 89 第六章 未來展望 91 參考文獻 92 | |
dc.language.iso | zh-TW | |
dc.title | 硝酸鋁前處理對凝膠溶膠鈍化鍍鋅鋼板高溫氧化行為之影響 | zh_TW |
dc.title | The Influence of Aluminum Nitrate Pre-Treatment on High Temperature Oxidation Resistance of Dip-Coated Silica Coating on Galvanized Steel | en |
dc.type | Thesis | |
dc.date.schoolyear | 106-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 鄭維仁,羅亦旋,林新智,鄭憶中 | |
dc.subject.keyword | 熱衝壓,熱浸鍍鋅,矽烷化合物,凝膠-溶膠,前處理, | zh_TW |
dc.subject.keyword | Press hardening steel,Galvanized steel,Silane,Sol-Gel,Pre-treatment, | en |
dc.relation.page | 97 | |
dc.identifier.doi | 10.6342/NTU201802740 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2018-08-08 | |
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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