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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 李岳聯(Yueh-Lien Lee) | |
dc.contributor.author | Tzu-En Chen | en |
dc.contributor.author | 陳子恩 | zh_TW |
dc.date.accessioned | 2021-06-17T04:33:24Z | - |
dc.date.available | 2020-09-03 | |
dc.date.copyright | 2020-09-03 | |
dc.date.issued | 2020 | |
dc.date.submitted | 2020-09-01 | |
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Normand, EIS evaluation of steady-state characteristic of 316L stainless steel passive film grown in acidic solution. Electrochem. Commun., 2013. 26: p. 10-12. 40. Lopez, N., et al., Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels. Mater. Sci. Eng., A, 1997. 229(1): p. 123-128. 41. quot, et al., Measurement of pseudorapidity distributions of charged particles in proton-proton collisions at √(s) #x3D; 8 TeV by the CMS and TOTEM experiments. 42. Wasnik, D.N., et al., Resistance to sensitization and intergranular corrosion through extreme randomization of grain boundaries. Acta Mater., 2002. 50(18): p. 4587-4601. 43. Luo, H., et al., Characterization of passive film on 2205 duplex stainless steel in sodium thiosulphate solution. Appl. Surf. Sci., 2011. 258(1): p. 631-639. 44. Luo, H., et al., The passive behaviour of ferritic stainless steel containing alloyed tin in acidic media. 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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70638 | - |
dc.description.abstract | 超級沃斯田鐵系不鏽鋼不僅有良好的耐腐蝕性質,也優異的機械性能,在未來的應用上潛力無窮,相較於一般常見的304或316不鏽鋼,超級不鏽鋼添加了高含量的合金元素,包括鉻、鎳、鉬、銅等等,不同的合金元素對超級不鏽鋼之機械性質或耐腐蝕性質有不同層面的作用。本研究探討新開發之中熵超級沃斯田鐵系不鏽鋼(Medium-entropy Super Austenitic Stainless Steel)冷軋鋼板在700°C不同時效熱處理時間會對材料表現出的性能有什麼影響,並與已被妥善研究的商用超級不鏽鋼(S31254)與抗菌不鏽鋼(304-Cu)做比較。第一部分探討材料硬度的改變,富銅相在底材內均勻析出使不鏽鋼達到析出硬化的效果,在4小時的熱處理條件下達到頂時效;爾後,晶粒內部的第二相析出物也會造成硬度提升。第二部分探討抗腐蝕性質的變化,在動電位循環極化曲線中只有48小時熱處理試片的抗蝕能力有明顯下降,然而在陽極定電位極化與EIS試驗中可以觀察到每個熱處理條件之間的差異,時效熱處理時間越長,所得的鈍化區穩態電流逐漸增大,且鈍化膜提供的阻抗隨之下降;粒間腐蝕測試明顯可看出敏化的現象跟熱處理的時間呈正相關。第三部分研究材料抗菌效果隨熱處理時間的演變,隨熱處理時間的加長,在固態瓊脂培養基中生成的菌落數遞減,表現出抗菌的能力。微結構分析發現,較長時間的時效熱處理除了讓富銅相析出,也讓晶界上生成富鉬的第二相析出物,即是造成材料抗蝕能力下降的原因。根據XPS分析結果,48小時長時間時效的試片,表面形成的鈍化膜組成成分與固溶不鏽鋼與4小時時效熱處理的試片不同,成分中含有較高比例的氫氧化鉻,而會形成穩定鈍化膜的氧化鉻比例下降,是造成抗蝕能力下降的原因。最後,由於長時間時效的中熵超級不鏽鋼的抗蝕能力下降,代表底材更容易氧化溶解,釋放較多的銅離子即為抗菌能力提升的原因。 | zh_TW |
dc.description.abstract | Super stainless steels with high portion of alloy, chromium, nickel, molybdenum and copper, possess excellent anti-corrosion resistant and remarkable mechanical properties which has high potentials for engineering applications. In this thesis, the effect of 700°C aging treatment for various time on behaviors of a novel Medium-entropy Super Austenitic Stainless Steel were thoroughly studied while making a comparison with commercial super austenitic stainless steel S31254 and anti-bacterial copper-bearing 304Cu-SS. First of all, we illustrated the effects on hardness variation. Cu-rich phase was precipitated on matrix and leads to precipitate hardening with peak aging occurring on 4 hours aged specimen. Secondly, we discuss the anti-corrosion abilities of specimens. Based on cyclic potentiodynamic polarization curves, only 700°C 48hr specimen shows obvious decrease in corrosion resistance. However, the difference of anti-corrosion properties is distinct for each specimen in anodic potentiostatic polarization. Additionally, the protection from passive films varied among specimens. Aging time has huge impact on these properties. With prolonged aging time, the steady state current densities increase gradually and the impedance provided by passive films decayed. The level of intergranular corrosion are positively related to aging time as well. Thirdly, we investigated the antibacterial properties of ME-ASS. the number of incubated colonies drops with increased aging time which shows the ability to kill bacteria. We found second phase precipitation on grain boundaries on specimens aged more than 12 hours by TEM, this is the main cause of worse anti-corrosion properties of the stainless steels. From XPS analysis, 48 hours aged stainless steel possessed a passive film with higher portion of chromium hydroxide and less chromium oxide which is the key to form stable passive films. As a result, 48 hours aged specimen performed a inferior anticorrosion ability. Lastly, the materials are prone to corrosion and release more metallic ions when the anticorrosion properties are poor. The released copper ions are the main factor to enhanced antibacterial behaviors. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T04:33:24Z (GMT). No. of bitstreams: 1 U0001-2608202017290300.pdf: 9637155 bytes, checksum: 96de7ca201055a0fbc360c517afff96d (MD5) Previous issue date: 2020 | en |
dc.description.tableofcontents | 致謝 ii 摘要 iv Abstract v 圖目錄 ix 表目錄 xiii 第一章 前言 1 第二章 文獻回顧 2 2-1 腐蝕概論 2 2-1-1 腐蝕介紹 2 2-1-2 腐蝕熱力學 2 2-1-3 腐蝕動力學 6 2-1-4 腐蝕種類 9 2-2 不鏽鋼簡介 15 2-2-1 不鏽鋼介紹與鈍化機制 15 2-2-2 不鏽鋼分類 17 2-2-3 沃斯田鐵系超級不鏽鋼 19 2-3 熱處理對不鏽鋼之影響 20 第三章 實驗方法 25 3-1 實驗流程 25 3-2 實驗方法 27 3-2-1 材料成分與製程 27 3-2-2 微硬度試驗 28 3-2-3 微結構觀察 29 3-2-4 電化學試驗 30 3-2-5 抗菌性質評估 32 3-2-6 鈍化膜成分分析 33 第四章 結果與討論 34 4-1 硬度變化 34 4-2 微結構觀察 38 4-3 電化學性質評估 50 4-3-1 動電位循環極化試驗 50 4-3-2 定電位極化試驗 55 4-3-3 電化學阻抗頻譜試驗 58 4-3-4 粒間腐蝕試驗 62 4-3 抗菌性值與ICP-MS試驗 67 4-4 鈍化膜成分分析 71 4-5 中熵超級不鏽鋼性質機制與綜合探討 76 第五章 結論 80 第六章 未來展望 81 參考文獻 82 | |
dc.language.iso | zh-TW | |
dc.title | 中熵超級沃斯田鐵系不鏽鋼抗蝕與抗菌性質之研究 | zh_TW |
dc.title | Study of Corrosion Property and Antibacterial Property of Medium-Entropy Super Austenitic Stainless Steel | en |
dc.type | Thesis | |
dc.date.schoolyear | 108-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林招松(Chao-Sung Lin),鄭錦榮(Chin-Jung Cheng),顏鴻威(Hung-Wei Yen),李佳翰(Chia-Han Lee) | |
dc.subject.keyword | 中熵超級不鏽鋼,時效處理,析出物,抗蝕性,抗菌性, | zh_TW |
dc.subject.keyword | Medium-entropy Super Austenitic Stainless Steel,Aging treatment,Precipitation,Corrosion resistance, | en |
dc.relation.page | 86 | |
dc.identifier.doi | 10.6342/NTU202004173 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2020-09-02 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
顯示於系所單位: | 工程科學及海洋工程學系 |
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