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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 | Shih-An Yang | en |
dc.contributor.author | 楊世安 | zh_TW |
dc.date.accessioned | 2021-07-11T15:35:49Z | - |
dc.date.available | 2021-08-21 | |
dc.date.copyright | 2018-08-21 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2018-08-15 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79004 | - |
dc.description.abstract | 鎂合金具有低密度、高質比強度、良好電磁遮蔽率、高散熱率以及生物可相容等多項優點,其中,鎂鋁合金因具有良好的機械性質與抗蝕性,而為廣泛應用之鎂合金,但鎂鋁合金之高腐蝕速率仍限制了其工程應用範圍,因此鎂鋁合金需作表面防蝕處理增進其抗蝕性。故本研究旨在以添加氟離子改良一錳酸鹽化成處理,使其能應用於AZ91D雙相鎂合金上提升抗蝕性,由於所欲改良之錳酸鹽化成溶液具有不穩定性,本研究之內容分為兩部分,其一為氟離子對化成溶液穩定性之影響,其二為氟離子對化成皮膜微結構與抗蝕性之影響,此外亦探討化成時間與氟離子濃度之效應。
研究結果指出,未添加氟離子之化成溶液由於不穩定性而使得溶液內之過錳酸根濃度隨時間快速下降,而添加氟離子則有效提升化成溶液穩定性;未添加氟離子之化成皮膜由於受到雙相伽凡尼效應之影響,化成皮膜形成不均,於β相上有大量二氧化錳沉積及伴隨出現之脫水裂紋,因此具有較差之抗蝕性;由於氟離子可於α相上形成較多之氟化鎂,鈍化α相減少雙相間之活性差距,抑制雙相伽凡尼效應,因此添加氟離子之化成皮膜形成均勻,且相當薄亦不具有脫水裂紋等缺陷,大幅提升皮膜抗蝕性;隨著化成時間的增加,化成皮膜厚度增長會使脫水裂紋增加,亦會使化成皮膜開始溶解而產生孔洞等缺陷,因而使抗蝕性劣化,60秒為最佳之化成時間;若添加至化成液之氟離子濃度太低,則氟離子不足以於α相上形成足夠之氟化鎂,因此失去抑制雙相效應之效果,又使得β相上有大量二氧化錳沉積及脫水裂紋,使得化成皮膜抗蝕性下降,相對的,若添加至化成液之氟離子濃度太高,雖同樣有抑制雙相效應之能力,但氟離子可與β相之鋁反應溶出形成孔洞,使得該處化成皮膜為薄弱區,因此亦使化成皮膜抗蝕性下降,0.02 M為最佳之氟離子濃度。動電位極化曲線之極化阻抗與電化學交流阻抗之總阻抗值兩者間具有一致性,且動電位極化曲線之腐蝕電流值與析氫試驗換算之電流值亦兩者接近,故本研究之抗蝕性分析方式間彼此互相映證,證明分析結果之正確性;此外,根據本研究電化學交流阻抗之等效電路模擬結果,發現可直接以高頻容抗圈大小評估化成皮膜抗蝕性。 | zh_TW |
dc.description.abstract | Magnesium alloys have low density, high specific strength, good magnetic shielding, good heat dissipation, and biocompatibility properties. Among them, due to good mechanical properties and proper corrosion resistance, magnesium-aluminum alloys are widely used. However, the applications of magnesium-aluminum alloys are still limited by their high corrosion rate. Surface modifications are thus required to enhance their corrosion resistance. Therefore, this study aimed at improving a permanganate conversion solution by addition of fluoride ion to make it effectively enhance the corrosion resistance of AZ91D magnesium alloy. Due to the instability of the original permanganate conversion solution, this study investigated the effect of fluoride ion on the solution stability and on the microstructure and corrosion resistance of the permanganate conversion coatings. Moreover, the effect of conversion treatment time and concentration of fluoride ion were also investigated to find the optimal treatment condition.
The results show that the permanganate concentration in the conversion solution without addition of fluoride rapidly decreases due to the instability, and the addition of fluoride ion reduces the decrease in permanganate concentration and effectively enhances the solution stability. Because of the dual-phase galvanic effect, the conversion coatings formed without fluoride are heterogeneous, and plenty of MnO2 forms on the β phase accompanied by dehydration cracks, which leads to poor corrosion resistance. In contrast, because more MgF2 forms on the α phase and therefore inhibits the dual-phase galvanic effect. As a result, the conversion coating formed with fluoride is homogenous, thin, and nearly crack-free, which significantly improves the corrosion resistance. With longer conversion treatment time, the thicker coatings induce more dehydration cracks, and the dissolution of the coatings leaves pore on the surface. Both degrade the corrosion resistance. Hence, the best treatment time is 60 s. With lower fluoride ion concentrations, MgF2 formation is inadequate and dual-phase galvanic effect is not inhibited, and once again, plenty of MnO2 forms on the β phase accompanied by dehydration cracks. With higher fluoride concentrations, although dual-phase galvanic effect is inhibited, the β phases are etched by fluoride ion leaving pores on the surface. Hence, the coatings formed with high and low fluoride ion concentrations are both defective and have inferior corrosion resistance, and the best fluoride concentration is 0.02 M. The polarization resistance deduced from potentiodynamic polarization (PD) is consistent with the total impedance estimated from electrochemical impedance spectroscopy (EIS). Moreover, the corrosion current measured from PD is close to the equivalent corrosion rate measured from hydrogen evolution test, which indicates the corrosion analyses are related to each other and prove the accuracy. In addition, based on the equivalent circuit used in the EIS analysis, the simulated total impedance at frequency approaching zero can be directly used to evaluate the corrosion resistance. | en |
dc.description.provenance | Made available in DSpace on 2021-07-11T15:35:49Z (GMT). No. of bitstreams: 1 ntu-107-R05527030-1.pdf: 7555336 bytes, checksum: c7f82addb3ab5a87cb541edf4d5a7e5e (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 口試委員審定書 i
誌謝 ii 中文摘要 iii Abstract iv 總目錄 vi 圖目錄 ix 表目錄 xi 第一章 前言 1 第二章 文獻回顧 3 2.1 鎂合金簡介 3 2.1.1 鎂合金之性質與應用 3 2.1.2 鎂合金之分類 6 2.2 常見之鎂合金系統 7 2.2.1 鎂鋁合金 8 2.2.2 鎂鋅合金 9 2.2.3 鎂鋰合金 10 2.2.4 鎂-稀土合金 11 2.3 鎂合金之腐蝕行為 14 2.3.1 均勻腐蝕 14 2.3.2 局部腐蝕 17 2.3.3 腐蝕環境之影響 20 2.3.4 負差值效應 21 2.4 鎂合金之表面防蝕處理 25 2.4.1 電化學處理 26 2.4.2 無電處理 28 2.4.3 物理處理 29 2.4.4 化成處理 30 2.4.4.1 鉻酸鹽化成處理 31 2.4.4.2 磷酸鹽化成處理 33 2.4.4.3 稀土金屬鹽化成處理 35 2.4.4.4 錫酸鹽化成處理 37 2.4.4.5 錳酸鹽化成處理 38 第三章 實驗方法 42 3.1 試樣前處理 43 3.2 化成液配置 43 3.3 浸泡化成處理 44 3.4 電化學分析 45 3.4.1 動電位極化曲線 46 3.4.2 電化學交流阻抗 47 3.5 微結構分析 48 3.5.1 表面形貌觀察 48 3.5.2 橫截面影像觀察 48 3.5.3 化學組成分析 49 3.6 應用性分析 49 3.6.1 化成液穩定性量測 49 3.6.2 析氫試驗 50 第四章 實驗結果與討論 52 4.1 化成溶液穩定性量測 52 4.2 化成皮膜微結構觀察及組成分析 53 4.2.1 表面形貌觀察 53 4.2.2 橫截面影像觀察 55 4.3 化成皮膜抗蝕性評估 62 4.3.1 動電位極化曲線 62 4.3.2 電化學交流阻抗 64 4.3.3 析氫試驗 70 4.4 化成時間對化成皮膜微結構與抗蝕性之影響 72 4.4.1 表面形貌觀察 72 4.4.2 橫截面影像觀察 76 4.4.3 動電位極化曲線 79 4.4.4 電化學交流阻抗 82 4.5 氟離子濃度對化成皮膜結構與抗蝕性之影響 86 4.5.1 化成溶液穩定性量測 86 4.5.2 表面形貌觀察 87 4.5.3 橫截面形貌觀察 89 4.5.4 動電位極化曲線 90 4.5.5 電化學交流阻抗 91 4.6 化成機制討論 93 第五章 結論 96 第六章 未來展望 97 參考文獻 98 | |
dc.language.iso | zh-TW | |
dc.title | 氟離子對AZ91D錳酸鹽化成皮膜結構與抗蝕性之影響 | zh_TW |
dc.title | Effect of Fluoride Ion on the Microstructure and Corrosion Resistance of Permanganate Conversion Coating on AZ91D Magnesium Alloy | en |
dc.type | Thesis | |
dc.date.schoolyear | 106-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 汪俊延,林景崎,蔡文達,葛明德 | |
dc.subject.keyword | 鎂合金,化成處理,錳酸鹽,電化學,析氫試驗, | zh_TW |
dc.subject.keyword | Magnesium alloys,Conversion coating,Permanganate,Electrochemical analysis,Hydrogen evolution test, | en |
dc.relation.page | 106 | |
dc.identifier.doi | 10.6342/NTU201803500 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2018-08-15 | |
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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