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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/80821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 | Sz-Han Chen | en |
| dc.contributor.author | 陳思翰 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:17:50Z | - |
| dc.date.available | 2021-11-05 | |
| dc.date.available | 2022-11-24T03:17:50Z | - |
| dc.date.copyright | 2021-11-05 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-10-08 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/80821 | - |
| dc.description.abstract | "高熵合金是一種2004年被提出的一種新型合金，近年相關研究也如雨後春筍般大量成長著。其中又以Cantor Alloy能形成穩定FCC單相且在低溫也優秀的機械特性，更是被廣為研究著，未來很有機會應用於工業界，因此本研究使用50公斤級大型鑄件去探討如果在嚴苛的工業環境下被當作結構用件應用著，是否能具有足夠的耐蝕性。而其中的Mn元素曾經有相關論文提出可能對抗蝕性有負面的影響，因此同時也使用低Mn材甚至是無Mn的Cantor Alloy作為對照，量化Mn元素對於Cantor Alloy抗蝕方面究竟有怎樣的影響。 經過SEM-EDX分析還有電化學實測後發現，鑄材的FeCrNiCoMnx(x=1.0, 0.6,0.3,0)高熵合金含有大量偏析，會使得電化學的再現性不佳，並且出現局部區域優先溶解的現象，所以為了減少偏析帶來的干擾，鑄材的FeCrNiCoMnx高熵合金會進行熱軋均質化的熱處理消除掉偏析。 經過熱軋均質化後的FeCrNiCoMnx高熵合金可以完全消除偏析並維持FCC單相結構，然而有許多在鑄造時留下的介在物並無法靠熱處理消除。這些介在物主要由熱力學最穩定的硫化物及氧化物依不同比例所構成可分成四大類，每種合金含有不盡相同種類的介在物，而其中Mn0.6(FeCrNiCoMn0.6)含有最高含量的介在物。介在物對電化學性質的影響透過極化曲線還有浸泡測試可以發現，介在物四周會容易因為電化學性質不同而有加凡尼腐蝕的可能，成為腐蝕的起始位置，導致所有FeCrNiCoMnx高熵合金的腐蝕速率的遠高於304L不鏽鋼。FeCrNiCoMnx高熵合金的鈍化性質則藉由EIS電化學測試和XPS分析鈍化層後得知Mn不但容易產生MnS型介在物，還會和Cr競爭氧化，導致FeCrNiCoMnx高熵合金中的Mn0.6、Mn0.3(FeCrNiCoMn0.3)即使底材有比304L不鏽鋼還多的Cr，鈍化層中最主要的鈍化物種Cr2O3含量不及於304L不鏽鋼，鈍化性質也是一樣的趨勢。 為了消除掉表面的介在物，本研究引入了不鏽鋼的酸洗配方，分別是氫氟酸和硝酸混合溶液的含氫氟酸配方和僅使用硝酸溶液的硝酸配方。雖然酸洗後無法直接達到陽極極化的鈍化效果，仍需要後續陽極極化處理，但仍然可以看到酸洗有一定程度上消除介在物的效果。含氫氟酸配方能夠消除掉表面大多數的介在物，而硝酸配方則只能消除掉硫化物的介在物，氧化物的清除效果有限，然而經由SEM影像可以發現氫氟酸雖可以清除掉大多數介在物，但同樣也會攻擊蝕刻晶界並讓介在物原本位置附近出現大量孔洞，可能會對後續鈍化有負面的影響。陽極極化後電化學EIS測試也發現使用含氫氟酸配方酸洗後試樣僅能小幅提升鈍化性質，對於部分合金甚至有負面的影響；使用硝酸配方酸洗後的試樣大多都可以大幅提升鈍化性質，僅Mn0.6可能因為酸洗後仍留有些許介在物存在而效果沒有那麼明顯，但酸洗對後續鈍化上依舊是帶來正面的效應。XPS的鈍化層分析中則發現，經含氫氟酸配方酸洗，表面會有大量F離子殘留，會導致鈍化層中富集的Cr2O3轉換成鈍化性質稍差一些的Cr(OH)3，且會和O競爭Cr，形成CrF後導致鈍化膜的融解，而在硝酸配方酸洗後卻沒有發現這樣的現象，依然是Cr2O3富集，甚至含有更多，因此，酸洗後鈍化性質上，含氫氟酸配方的酸洗效益遠遠不及使用硝酸配方進行酸洗所帶來的效益大。 " | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-24T03:17:50Z (GMT). No. of bitstreams: 1 U0001-0310202116264400.pdf: 10479786 bytes, checksum: a2be9998eb44fc12a54c71d9aa5dce86 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | "目錄 碩士學位論文口試委員會審定書 i 誌謝 ii 摘要 iv Abstract vi 總目錄 ix 圖目錄 xii 表目錄 xix 第1章 前言 1 第2章 文獻回顧 2 2.1 高熵合金 2 2.1.1 高熵合金簡介 2 2.1.2 高熵合金的定義 4 2.1.3 高熵合金的四大特性 5 2.1.4 Cantor Alloy 9 2.2 高熵合金之腐蝕行為 11 2.2.1 Mn的影響 11 2.2.2 Al的影響 21 2.2.3 Cr的影響 29 2.2.4 Cu的影響 34 第3章 實驗步驟與方法 39 3.1 試片製備 39 3.1.1 鑄材 (As-Cast) 39 3.1.2 熱軋均質化材 (Homogenized-Hot Rolled, H-HR)註1 39 3.1.3 304L不鏽鋼 40 3.1.4 試片前處理 40 3.2 電化學測試 43 3.2.1 開路電位平衡 43 3.2.2 動電位極化曲線 43 3.2.3 硫酸系統的陽極處理與鈍化膜穩定之觀察 44 3.2.4 電化學阻抗譜(EIS) 44 3.2.5 重量損失測試 45 3.3 顯微結構分析方法 46 3.3.1 掃描式電子顯微鏡(SEM) 46 3.3.2 能量散射X射線譜(EDX) 46 3.3.3 電感耦合電漿體質譜法(ICP-MS) 47 3.3.4 X-Ray光電子能譜儀(XPS) 47 3.4 酸洗化學配方 49 第4章 實驗結果與討論 51 4.1 鑄材(As-Cast) 51 4.1.1 基材的偏析 51 4.1.2 偏析對於電化學測試的影響 56 4.2 熱軋均質化材(H-HR) 59 4.2.1 熱處理後的基本性質 59 4.2.2 FeCrNiCoMnx高熵合金中的介在物(Inclusions) 65 4.2.3 動電位極化曲線 74 4.2.4 浸泡測試 76 4.2.5 EIS測試 82 4.2.6 XPS分析 87 4.3 酸洗的成效 92 4.3.1 EIS鈍化測試 92 4.3.2 SEM-EDX顯微結構觀察 102 4.3.3 XPS的鑑定 109 第5章 結論 117 第6章 未來工作 119 第7章 參考文獻 120 " | |
| dc.language.iso | zh-TW | |
| dc.subject | 鈍化膜 | zh_TW |
| dc.subject | 高熵合金 | zh_TW |
| dc.subject | 介在物 | zh_TW |
| dc.subject | 偏析 | zh_TW |
| dc.subject | Cantor Alloy | zh_TW |
| dc.subject | 酸洗 | zh_TW |
| dc.subject | Cantor alloy | en |
| dc.subject | passive film | en |
| dc.subject | pickling | en |
| dc.subject | inclusion | en |
| dc.subject | element segregation | en |
| dc.subject | High entropy alloy | en |
| dc.title | "FeCrNiCoMnx(x=1.0,0.6,0.3,0)高熵合金於0.5M硫酸中的抗蝕性質之研究" | zh_TW |
| dc.title | "The Corrosion Behavior of FeCrNiCoMnx(x=1.0,0.6,0.3,0) High Entropy Alloys in 0.5M Sulfuric Acid Solution" | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.author-orcid | 0000-0001-9094-0466 | |
| dc.contributor.oralexamcommittee | 顏鴻威(Hsin-Tsai Liu),蔡文達(Chih-Yang Tseng),李岳聯,葉宗洸 | |
| dc.subject.keyword | 高熵合金,Cantor Alloy,偏析,介在物,酸洗,鈍化膜, | zh_TW |
| dc.subject.keyword | High entropy alloy,Cantor alloy,element segregation,inclusion,pickling,passive film, | en |
| dc.relation.page | 131 | |
| dc.identifier.doi | 10.6342/NTU202103517 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-10-12 | |
| 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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