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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/94150完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林招松 | zh_TW |
| dc.contributor.advisor | Chao-Sung Lin | en |
| dc.contributor.author | 林怡君 | zh_TW |
| dc.contributor.author | Yi-Chun Lin | en |
| dc.date.accessioned | 2024-08-14T16:57:53Z | - |
| dc.date.available | 2024-08-15 | - |
| dc.date.copyright | 2024-08-14 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-04 | - |
| dc.identifier.citation | 1. Esmaily, M., et al., Fundamentals and advances in magnesium alloy corrosion. Progress in Materials Science, 2017. 89: p. 92-193.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/94150 | - |
| dc.description.abstract | 鎂合金有低密度及高比強度等特性，被廣泛應用在各個領域，包括生醫、航太、汽車、電子等領域。其中添加稀土元素的鎂合金因其能提高強度、高溫抗潛變能力、耐燃性，以及抗蝕性，因此近年來有許多研究。而鎂合金具高活性，故為了進一步提高應用時的抗蝕性，對其做化成處理。
WE43中有兩種兩種微米級二次相，分別是富Y和富Zr二次相，其中富Zr二次相會造成WE43的伽凡尼腐蝕，故研究此兩種二次相對化成膜成膜的影響為一重要課題。 本研究使用過錳酸鹽化成進行第一道化成處理，由電子顯微鏡分析得知膜層的主要組成為 MnO2/Mg(OH)2/MgO，並觀察到在晶界處未成膜，以及當浸泡時間較長，膜層上會有脫水裂紋，這些缺陷造成抗蝕性提升有限。為填補這些缺陷，在第一道膜層上，再進行第二道六氟鋯酸鹽化成處理，由電子顯微鏡觀察到經第二道 化成後，晶界未成膜處被 ZrO2 所填補。電化學量測結果顯示，相較於只有一道次處理的，兩道次化成處理的腐蝕電流小了一個數量級，且大幅提升了交流阻抗測試中等效電路的總阻抗值。而鹽霧測試結果符合電化學量測，在24h測試後，經兩道次化成處理的腐蝕面積僅有2%。經 KMnO4/K2ZrF6 兩步驟化成處理的式樣呈金黃色，同時達到美觀及抗蝕性提高的效果。 根據微結構分析，化成處理過的式樣，在鹽霧後的巨觀腐蝕白點源自於富Zr顆粒，因 Cl-會攻擊富 Zr顆粒周圍的缺陷處，引起Zr顆粒與鎂基材間的伽凡尼腐蝕。而富Y顆粒對成膜並未有顯著的影響，在經過錳酸鹽化成處理後會被原位氧化為Y2O3。 | zh_TW |
| dc.description.abstract | Magnesium and its alloys, characterized by low density and high specific strength, are widely utilized in various fields, including biomedical, aerospace, automotive, and electronics. In recent years, there has been significant research interest in magnesium alloys containing rare earth elements due to their ability to enhance strength, high-temperature creep resistance, flammability, and corrosion resistance. Magnesium alloys are highly reactive, thus requiring surface treatments such as conversion coatings to further improve their corrosion resistance for practical applications.
In the case of WE43, two types of micron-scale secondary phases exist Y-rich and Zr-rich phases. Among them, the Zr-rich phase is known to cause galvanic corrosion in WE43. Therefore, studying the effects of these two secondary phases on the formation of conversion coatings is an important research topic. This study employed permanganate-based conversion coating as the first step treatment. Electron microscopy analysis revealed that the main composition of the coating layer is MnO2/Mg(OH)2/MgO. It was observed that no conversion film forms at grain boundaries, and prolonged immersion led to dehydration cracks on the coating. These defects resulted in a limited enhancement of corrosion resistance. To address these defects, the second K2ZrF6 conversion treatment was applied on top of the first coating. Electron microscopy observations revealed that after the second treatment, the areas where the film doesn’t form at grain boundaries are sealed with ZrO2. Electrochemical measurements showed that compared to the single-step treatment, the corrosion current decreased by an order of magnitude with the two-step treatment. Additionally, EIS results show a significant increase in the total impedance of the film. The salt spray test results were consistent with the electrochemical measurements. After a 24-hour test, the corrosion area of the samples treated with the two-step conversion process was only 2 %. Samples treated with the KMnO4/K2ZrF6 conversion process exhibited a golden color, achieving both aesthetic appeal and improved corrosion resistance. According to microstructural analysis, macroscopic corrosion spots observed after salt spray testing originated from Zr-rich particles. Cl attacked the defects around these particles, leading to galvanic corrosion between Zr particles and the Mg matrix. Y-rich particles do not significantly affect the formation of the coating and are oxidized in situ to Y2O3 after permanganate-based conversion treatment. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-08-14T16:57:53Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-08-14T16:57:53Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 誌謝 i
中文摘要 ii ABSTRACT iii CONTENT v LIST OF FIGURES ix LIST OF TABLE xv Chapter 1 Introduction 1 Chapter 2 Paper Review 2 2.1 Introduction of magnesium alloys 2 2.1.1 Properties of pure magnesium 2 2.1.2 Classification of magnesium alloys 3 2.1.3 The effect of aluminum on Mg alloys 4 2.1.4 The effect of zirconium on Mg alloys 6 2.1.5 Magnesium-rare earth alloys 9 2.1.5.1 The effect of yttrium on Mg alloys 10 2.1.5.2 The effect of neodymium on magnesium alloys 12 2.2 Corrosion behavior of magnesium 15 2.2.1 Corrosion of pure magnesium 15 2.2.2 Corrosion type 17 2.2.2.1 General corrosion 17 2.2.2.2 Local corrosion 18 2.2.2.3 Galvanic corrosion 20 2.2.3 Negative Difference Effect 21 2.2.3.1 Monovalent magnesium model 22 2.2.3.2 Enhanced catalytic model 25 2.2.3.3 Film rupture model 26 2.2.4 Effect of corrosion environment on Mg 28 2.2.4.1 Effect of chloride on corrosion 28 2.2.4.2 Effect of sulfate on corrosion 29 2.3 Conversion coatings 31 2.3.1 Chromate conversion coatings 31 2.3.2 Phosphate conversion coatings 33 2.3.3 Permanganate conversion coatings 34 2.3.4 Rare earth conversion coatings 35 2.3.5 ZrF62--containing conversion coatings 36 Chapter 3 Experiments 39 3.1 Sample preparation 39 3.2 Conversion bath 39 3.3 Surface Analysis 41 3.3.1 OM 41 3.3.2 SEM 42 3.3.3 TEM 42 3.4 Electrochemical Measurements 43 3.4.1 PDP 43 3.4.2 EIS 44 3.5 Salt spraying test 45 Chapter 4 Results and Discussion 46 4.1 Microstructure of as-polished WE43-T5 substrate 46 4.2 OCP of conversion process 47 4.3 OM observation 48 4.4 SEM observation 50 4.5 Cross-sectional analysis by TEM 57 4.6 Electrochemical analysis 67 4.6.1 Potentiodynamic polarization 67 4.6.2 Electrochemical impedance spectroscopy 69 4.7 Salt spraying test 72 4.7.1 Optical observation after salt spraying 72 4.7.2 SEM observation after salt spraying 76 4.8 Mechanism of conversion coatings 78 4.8.1 KMnO4 CC 78 4.8.2 K2ZrF6 CC 80 4.9 The effect of second phase on corrosion resistance 82 Chapter 5 Conclusions 83 Chapter 6 Future Works 84 Reference 86 | - |
| dc.language.iso | en | - |
| dc.subject | WE43 鎂合金 | zh_TW |
| dc.subject | 稀土元素 | zh_TW |
| dc.subject | 過錳酸鹽 | zh_TW |
| dc.subject | 六氟鋯酸鹽 | zh_TW |
| dc.subject | 化成皮膜 | zh_TW |
| dc.subject | 電化學 | zh_TW |
| dc.subject | 抗蝕性 | zh_TW |
| dc.subject | Corrosion resistance | en |
| dc.subject | WE43 magnesium alloy | en |
| dc.subject | Rare earth elements | en |
| dc.subject | Permanganate | en |
| dc.subject | Potassium hexafluorozirconate | en |
| dc.subject | Conversion coating | en |
| dc.subject | Electro-chemistry | en |
| dc.title | WE43-T5鎂合金二次相對pH值驅動化成皮膜的影響 | zh_TW |
| dc.title | The Effect of the second phase on the pH-assisted conversion coating on WE43-T5 magnesium alloy | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 蔡文達;汪俊延;林景崎;侯文星 | zh_TW |
| dc.contributor.oralexamcommittee | Wen-Ta Tsai;Jun-Yen Uan;Jing-Chie Lin;Wen-Hsing Hou | en |
| dc.subject.keyword | WE43 鎂合金,稀土元素,過錳酸鹽,六氟鋯酸鹽,化成皮膜,電化學,抗蝕性, | zh_TW |
| dc.subject.keyword | WE43 magnesium alloy,Rare earth elements,Permanganate,Potassium hexafluorozirconate,Conversion coating,Electro-chemistry,Corrosion resistance, | en |
| dc.relation.page | 95 | - |
| dc.identifier.doi | 10.6342/NTU202402799 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-08-07 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 材料科學與工程學系 | - |
| 顯示於系所單位： | 材料科學與工程學系 | |
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