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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 鄭修偉 | zh_TW |
| dc.contributor.advisor | Hsiu-Wei Cheng | en |
| dc.contributor.author | 李耕鴻 | zh_TW |
| dc.contributor.author | Geng-Hong Li | en |
| dc.date.accessioned | 2024-09-25T16:29:41Z | - |
| dc.date.available | 2024-09-26 | - |
| dc.date.copyright | 2024-09-25 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-09-13 | - |
| dc.identifier.citation | [1] Yu Fu, Jun Li, Hong Luo, Cuiwei Du, and Xiaogang Li. Recent advances on environmental corrosion behavior and mechanism of high-entropy alloys. Journal of Materials Science&Technology, 80:217–233, 2021.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95989 | - |
| dc.description.abstract | 理解複雜多元素材料中分子等級的電化學反應機制對於許多應用來說至關重要。在合金鈍化反應中，合金表面形成惰性的三氧化二鉻被認為是提高合金抗腐蝕性的機制。然而，在當前的討論，三氧化二鉻與其他元素的電化學交互作用還未被明確定義，尤其是三氧化二鉻和鐵之間的交互作用。因此，三氧化二鉻的應用受到一定的限制。在研究中，我們使用互補性分析，應用即時感應耦合電漿質譜儀監測以及非即時 X 射線光電子能譜儀來探討關於鉻和鐵的鈍化反應。為了提高表面分析的精確度，我們使用角度解析方法及結合雙陰極 X 光源，包括高能量硬 X 光光電子能譜儀。此方法可達到 12 奈米的非破壞性深度分析，並且分析化學態變化。在晶體場多重態理論下，我們的結果推測形成鉻-鐵混合氧化物結構，在近中性環境中能提供較好的抗腐蝕能力。 | zh_TW |
| dc.description.abstract | Understanding the electrochemical reaction mechanisms at the molecular level in complex multi-principal element materials is crucial for various applications. In alloy passivation reactions, the formation of an inert Cr2O3 surface is a widely accepted mechanism for enhancing alloy corrosion resistance. However, the electrochemical interaction between Cr2O3 and many other elements, particularly Fe, has not been well-defined in the current discussion. As a result, the applicability of the Cr2O3 passive film model is somewhat constrained. In this work, we utilize a complementary analysis strategy by applying in-situ inductively coupled plasma mass spectrometry (ICP-MS) monitoring, and ex-situ X-ray photoelectron spectroscopy (XPS) characterization to investigate the reaction of passive film involving Cr and Fe. To enhance the precision of surface analysis, we employ an angle-resolved approach in conjunction with dual-anode X-ray sources, including HAXPES. This method enables the non-destructive construction of a 12 nm depth profile, revealing variations in chemical states. Considering the crystal field multiplet theory, our results suggest the formation of a Cr-Fe mixed oxide structure that offers a broad potential range of passivity under near-neutral condition. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-09-25T16:29:41Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-09-25T16:29:41Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 致謝 III
Abstract IV Abstract V Contents VII List of Figures X List of Tables XIV Chapter 1 Introduction 1 1.1 Anti-corrosion materials . . . . . . . . . . . . . . . . . . . . . .1 1.2 The anti-corrosion behavior on chromium compound . . . . . . . . . .2 1.3 Utilizing Pourbaix diagrams to forecast the corrosion behavior of alloys in a solution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 The analytical method in corrosion studies . . . . . . . . . . . . . . . .4 1.5 The current challenges . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.6 The highlight of this work . . . . . . . . . . . . . . . . . . . . . . . . 9 Chapter 2 Experimental Section 10 2.1 Materials and chemicals . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2 Thin film sample preparation . . . . . . . . . . . . . . . . . . . . . . .11 2.3 Electrochemical flow cell . . . . . . . . . . . . . . . . . . . . . . . 12 2.4 X-ray photoelectron spectroscopy and angle-resolved technique . . . . 12 2.4.1 The principle of X-ray photoelectron . . . . . . . . . . . . . . . . . 12 2.4.2 Measuring and fitting parameters of XPS . . . . . . . . . . . . . . . 15 2.4.3 Angle resolved XPS (ARXPS) . . . . . . . . . . . . . . . . . . . . 18 2.4.4 XPS sputter depth profile . . . . . . . . . . . . . . . . . . . . . . . 19 2.5 Inductively coupled plasma mass spectroscopy (ICP-MS) . . . . . . . . 19 2.6 Atomic force microscopy (AFM) . . . . . . . . . . . . . . . . . . . . . 21 2.7 Polarization sequence . . . . . . . . . . . . . . . . . . . . . . . . . 21 Chapter 3 Results 23 3.1 Surface characterization of pristine thin films . . . . . . . . . . . . 23 3.2 Electrochemical activity and surface morphology characterization 29 3.3 ICP-MS and XPS complementary analysis on surface composition . . . 33 3.4 Angle-resolved HAXPES and depth-profiling in passive structure analysis 35 3.4.1 pristine system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.4.2 pH 5 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.4.3 pH 3 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Chapter 4 Discussion 40 4.1 The break-down mechanism of Cr2O3 . . . . . . . . . . . . . . . . . . 40 4.2 Formation of Cr-Fe mixed oxide layer . . . . . . . . . . . . . . . . . .41 4.3 Stability analysis of Cr-Fe mixed oxide structures . . . . . . . . . . .43 4.4 The behavior of Ni species during the dissolution process . . . . . . . 45 Chapter 5 Conclusion and Future Outlook 48 5.1 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 5.2 Future Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 References 50 | - |
| dc.language.iso | en | - |
| dc.title | 解析鉻和鐵在界面電化學反應中的交互作用：利用 HAXPES 和 ICP-MS 進行互補性分析 | zh_TW |
| dc.title | Deciphering the Interplay between Cr and Fe during Interfacial Electrochemical Processes: A Complementary Analysis Using HAXPES and ICP-MS | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-1 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 陳浩銘;陳俊顯;簡儀欣 | zh_TW |
| dc.contributor.oralexamcommittee | Hao-Ming Chen;Chun-Hsien Chen;Yi-Hsin Chien | en |
| dc.subject.keyword | 電化學,中熵合金,腐蝕,pH活性,雙陰極硬X射線光電子能譜學, | zh_TW |
| dc.subject.keyword | Electrochemistry,Medium Entropy Thin Film Alloy,Corrosion,pH-dependent Activity,Dual-Anode Hard X-ray Photoelectron Spectroscopy, | en |
| dc.relation.page | 61 | - |
| dc.identifier.doi | 10.6342/NTU202404369 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2024-09-13 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 化學系 | - |
| dc.date.embargo-lift | 2029-09-12 | - |
| 顯示於系所單位： | 化學系 | |
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