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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79860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 | Kuo-Min Hsu | en |
| dc.contributor.author | 徐國閔 | zh_TW |
| dc.contributor.author | f06527047 | |
| dc.date.accessioned | 2022-11-23T09:14:14Z | - |
| dc.date.available | 2022-02-16 | |
| dc.date.available | 2022-11-23T09:14:14Z | - |
| dc.date.copyright | 2022-02-16 | |
| dc.date.issued | 2022 | |
| dc.date.submitted | 2022-01-27 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79860 | - |
| dc.description.abstract | "此研究首次探討50公斤級FeCrNiCoMnx (x = 1.0, 0.6, 0.3, and 0)高熵合金塊材之顯微結構與其在3.5 wt%氯化鈉及0.5 M硫酸腐蝕行為，旨在釐清塊材缺陷與錳含量之影響，此外，使用在不鏽鋼ASTM A380M-17的酸洗亦首次使用並研究於FeCrNiCoMnx以改善含錳FeCrNiCoMnx之鈍化膜穩定性及保護力。錳被發現會偏析在枝間區域且其伽凡尼腐蝕為造成在兩種溶液中腐蝕首先發生的主要原因，此藉1050度C之80%的熱軋及900度C下1.5小時的退火減少偏析，腐蝕電流密度會下降。對於均質化之FeCrNiCoMnx，0.5 M硫酸陽極極化成長之鈍化膜抗蝕能力於0.5 M硫酸中隨著Mn含量的下降而提升，但含錳之FeCrNiCoMnx相比304L不鏽鋼仍不預期的低，此歸因於錳與鉻於鈍化膜中的競爭氧化，導致具保護性之Cr2O3比預期還低之故。然而在沒有偏析情況下，因為硫化錳夾雜物的存在，陽極極化生長之FeCrNiCoMnx鈍化膜穩定性在3.5 wt%氯化鈉及0.5 M硫酸仍沒有獲得改善，由於硫化錳溶解後溶液中含硫物種的影響，施加陽極極化後之含錳類FeCrNiCoMnx在極化後之硫酸浸泡其鈍化膜仍有一定機率發生崩解。 儘管錳於此類合金有負面之影響，錳於機械性質卻有其不可或缺的角色，為解決由硫化錳導致之鈍化膜不穩定的問題，此研究採用先氟硝酸後硝酸之複合酸洗，可消除硫化錳及其含硫物種並使鈍化膜加強鈍化，此方法成功改善含錳類FeCrNiCoMnx鈍化膜在3.5 wt%氯化鈉及0.5 M硫酸的穩定性並提升其抗蝕能力。然而鈍化膜抗蝕能力改善的程度卻隨著Mn含量的下降而跟著下降，且此種複合酸洗對無錳的FeCrNiCo合金卻反而有負面的影響，原因應為在含氫氟酸的酸洗溶液中，與表面鈍化膜中之鉻與錳含量有關，較高的鉻含量會與氫氟酸在氧化膜中形成更多的[Cr(H2O)6]F3，而MnO2可減緩氫氟酸對Cr2O3的攻擊，較低的錳含量則造成更多之Cr2O3與MnO2反應。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-23T09:14:14Z (GMT). No. of bitstreams: 1 U0001-2701202215013500.pdf: 11773013 bytes, checksum: 447473e7fe3e18e985fc61cbfa7de7c9 (MD5) Previous issue date: 2022 | en |
| dc.description.tableofcontents | "Content 口試委員會審定書 i 致謝 ii 摘要 iii Abstract iv Content vi List of Figures x List of Tables xvii Chapter 1 Introduction 1 1.1 Definition 1 1.2 Background 2 1.3 Motivation 4 Chapter 2 Literature review 7 2.1 Four HEA core effects 7 2.1.1 The high entropy effect 7 2.1.2 The sluggish diffusion effect 10 2.1.3 The severe lattice distortion effect 12 2.1.4 The cocktail effect 13 2.2 Common CCA families 13 2.2.1 3d transition metal CCAs 14 2.2.2 Refractory metal CCAs 17 2.2.3 Other alloy families 18 2.3 Factors affecting the corrosion behavior of MPEAs 20 2.3.1 Structure 20 2.3.2 Composition 21 2.3.3 Heterogeneity 22 2.3.4 Environment 23 2.4 The passive film of FeCrNiCoMn 24 2.4.1 NaCl 24 2.4.2 H2SO4 25 2.5 The effects of constituent elements in FeCrNiCoMn 26 2.5.1 Fe 26 2.5.2 Cr 26 2.5.3 Ni 28 2.5.4 Co 28 2.5.5 Mn 28 Chapter 3 Experimental procedure 30 3.1 Alloys fabrication and sample preparation 30 3.2 Materials characterization 32 3.3 Potentiodynamic polarization test 33 3.4 Immersion test 34 3.5 EIS 35 3.6 Characterization of the passive film 35 3.7 Analysis on inclusions 38 3.8 Pickling 38 Chapter 4 Results and discussion 40 4.1 As-cast alloys characterization 40 4.1.1 Etching structure 40 4.1.2 Solidification defects 43 4.2 Hot-rolled FeCrNiCoMn after heat treatments 48 4.2.1 Residual segregation 48 4.2.2 Structural analysis 51 4.3 Corrosion behavior of AC, HR, H-HR alloys 53 4.3.1 3.5 wt % NaCl 53 4.3.2 0.5 M H2SO4 58 4.3.3 Passive film in 0.5 M H2SO4 64 4.3.3.1 EIS 64 4.3.3.2 AES 74 4.3.4 The instability of the passive film 75 4.3.4.3 3.5 wt % NaCl 75 4.3.4.4 0.5 M H2SO4 77 4.4 H-HR FeCrNiCoMnx characterization 79 4.4.1 Structural analysis 79 4.4.2 Inclusion types 81 4.5 Mn influence and inclusion effect on the corrosion behavior 92 4.5.1 3.5 wt % NaCl 92 4.5.2 0.5 M H2SO4 96 4.5.3 Immersion tests in 0.5 M H2SO4 98 4.5.4 The instability of the passive film 105 4.5.5 Passive film 107 4.5.5.1 EIS 107 4.5.5.2 TEM 113 4.5.5.3 XPS 117 4.6 Improved stability and corrosion resistance 129 4.6.1 Microstructure 129 4.6.2 Composition 136 4.6.3 3.5 wt% NaCl 142 4.6.4 0.5 M H2SO4 144 4.6.5 Immersion test 152 Chapter 5 Discussion 157 5.1 The influences of metallurgical defects 157 5.1.1 3.5 wt % NaCl 157 5.1.2 0.5 M H2SO4 158 5.2 Possible electrochemical reactions in 0.5 M H2SO4 160 5.3 The formation of various inclusions 161 5.4 The effects of SO42- and Cl- 162 5.5 The influence of the inclusions 163 5.6 The pickling effect on the passive film 164 Chapter 6 Conclusions 166 Chapter 7 Future work 169 Reference 170" | |
| dc.language.iso | en | |
| dc.subject | 酸洗 | zh_TW |
| dc.subject | 鈍化膜 | zh_TW |
| dc.subject | 陽極極化 | zh_TW |
| dc.subject | 塊材缺陷 | zh_TW |
| dc.subject | 高熵合金 | zh_TW |
| dc.subject | 腐蝕 | zh_TW |
| dc.subject | passive film | en |
| dc.subject | corrosion | en |
| dc.subject | high entropy alloy | en |
| dc.subject | bulk defects | en |
| dc.subject | anodic polarization | en |
| dc.subject | pickling | en |
| dc.title | FeCrNiCoMnx (x = 1 ~ 0)高熵合金工業級塊材顯微結構與腐蝕行為之研究 | zh_TW |
| dc.title | The Microstructure and Corrosion Behavior of FeCrNiCoMnx (x = 1 ~ 0) Industrial Bulk High Entropy Alloys | en |
| dc.date.schoolyear | 110-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 蔡文達(Chin-Kuo Chang),葉宗洸(Hao-Jan Yang),林新智(Yin-Ju Lien),李岳聯,顏鴻威 | |
| dc.subject.keyword | 高熵合金,塊材缺陷,腐蝕,鈍化膜,陽極極化,酸洗, | zh_TW |
| dc.subject.keyword | high entropy alloy,bulk defects,corrosion,passive film,anodic polarization,pickling, | en |
| dc.relation.page | 193 | |
| dc.identifier.doi | 10.6342/NTU202200233 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2022-01-27 | |
| 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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