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研究生:鄭凱勵
研究生(外文):Kai-Li Jeng
論文名稱:Mg,Al-hydrotalcite皮膜的組成結構分析及於鎂合金表面之抗腐蝕特性研究
論文名稱(外文):Corrosion Properties and Structural Characterization of Mg,Al-hydrotalcite Conversion Coating on Die-cast Mg Alloy
指導教授:汪俊延
指導教授(外文):Jun-Yen Uan
學位類別:碩士
校院名稱:國立中興大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
畢業學年度:96
語文別:中文
論文頁數:50
中文關鍵詞:MgAl-hydrotalcite鎂合金化成皮膜腐蝕
外文關鍵詞:MgAl-hydrotalciteMagnesium alloyConversion coatingCorrosion
相關次數:
  • 被引用被引用:3
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本研究試圖提供鎂合金一個環保的化成皮膜處理。以二氧化碳製備HCO3– / CO32–水溶液為處理液,於AZ91D鎂合金表面生長一層Mg,Al-hydrotalcite (Mg6Al2(OH)16CO3•4H2O)皮膜,並探究其抗腐蝕特性。針對此皮膜與其前驅物探討其結構差異與抗腐蝕性。本實驗室先前成功研究出在AZ91D鎂合金表面生長一層Mg,Al-hydrotalcite皮膜並提升表面之抗蝕性,但製備具抗腐蝕性之Mg,Al-hydrotalcite皮膜製程時間需24小時。故本研究適時改變HCO3– / CO32–水溶液之pH值,使AZ91D鎂合金表面加速形成Mg,Al-hydrotalcite,製程時間可縮短至4小時。研究結果顯示Mg,Al-hydrotalcite前驅物並未具有結晶相hydrotalcite之雙層結構且結構散亂無規則性。前驅物經鹼性pH11.5 HCO3– / CO32–水溶液處理兩小時後,轉化為具雙層結構之Mg,Al-hydrotalcite皮膜。顯示以鹼性HCO3– / CO32–水溶液加速Mg,Al-hydrotalcite皮膜生長之可行性。極化分析可知表面生長Mg,Al-hydrotalcite鍍層可使AZ91D鎂合金的腐蝕電流密度由180
The study explores an environmentally clean method for the formation of Mg conversion coating. HCO3– / CO32– aqueous solution was prepared by bubbling CO2 gas through deionized water and taken as conversion coating solution to synthesize Mg,Al-hydrotalcite conversion coating on AZ91D magnesium alloy. We focus on the discussion of the structural characterization and the corrosion properties of Mg,Al-hydrotalcite and its precursor. It was found that Mg,Al-hydrotalcite precursor did not have crystalline double-layered structure like hydrotalcite, and the structure of precursor was disordered. After immersing in HCO3– / CO32– aqueous solution of pH11.5 for two hours, Mg,Al-hydrotalcite precursor was transformed into Mg,Al-hydrotalcite which had double-layered structure. It was clear that the feasibility of using alkaline HCO3– / CO32– aqueous solution to accelerate the formation of Mg,Al-hydrotalcite conversion coating. According to the polarization measurement, the AZ91D substrate had Icorr ~ 180
中文摘要……………I
英文摘要……………Ⅲ
總目錄………………Ⅳ
表目錄……………… Ⅵ
圖目錄………………Ⅶ
第一章 前言…………1
第二章 實驗步驟與方法……5
2-1 實驗材料與試片前處理……5
2-2 HCO3– / CO32–水溶液與試片之製備……5
2-3 表面形貌與晶體結構分析……6
2-4 傅立葉紅外線光譜分析(FTIR)……6
2-5 固態核磁共振光譜分析(NMR)……7
2-6 拉曼光譜分析(Raman spectrum)……7
2-7 鹽霧試驗……8
2-8 電化學極化試驗……8
2-9 室溫放置腐蝕觀察……9
2-10 百格測試……9
第三章 結果與討論……13
3-1 GAXRD繞射分析……13
3-2 表面顯微組織之觀察……14
3-3 傅立葉紅外線光譜分析……14
3-4 固態核磁共振光譜分析……15
3-5 拉曼光譜分析……17
3-6 鹽霧試驗……18
3-7 電化學極化分析……18
3-8 室溫放置腐蝕觀察……20
3-9 Hydrotalcite組成結構分析……20
3-10 百格測試結果……22
第四章 結論……45
參考文獻……48

表目錄
表2-1 壓鑄AZ91D鎂合金之化學成分……10
表3-1 鹽霧測試結果……23

圖目錄
圖2-1 HCO3–/CO32–水溶液之製備方法示意圖……11
圖2-2 試片製作流程圖……12
圖3-1 CO2_2h試片表面皮膜之GAXRD分析結果……24
圖3-2 CO2_2h_pH11.5_2h試片表面皮膜之GAXRD分析結果……25
圖3-3 (a) CO2_2h試片表面之顯微組織……26
(b) CO2_2h_pH11.5_2h試片表面之顯微組織……27
圖3-4 高倍率觀察試片表面之顯微組織
(a) CO2_2h_pH11.5_2h……28
(b) CO2_2h……28
圖3-5 (a) CO2_2h橫截面顯微組織……29
(b) CO2_2h_pH11.5_2h橫截面顯微組織……29
圖3-6 FTIR光譜圖: (a) CO2_2h……30
(b) CO2_2h_pH11.5_2h……30
圖3-7 CO2_2h_pH11.5_2h與CO2_2h之1H NMR光譜圖……31
圖3-8 CO2_2h_pH11.5_2h與CO2_2h之27Al NMR光譜圖……32
圖3-9 六配位Al3+八面體結構示意圖……33
圖3-10 CO2_2h_pH11.5_2h與CO2_2h之13C NMR光譜圖……34
圖3-11 CO2_2h_pH11.5_2h與CO2_2h之拉曼光譜圖……35
圖3-12 鹽霧測試後表面觀察
(a) AZ91D鎂合金試片鹽霧測試12h……36
(b) CO2_2h試片鹽霧測試12h……36
(c) CO2_2h_pH11.5_2h試片鹽霧測試72h……36
圖3-13 CO2_2h_pH11.5_2h, CO2_2h與AZ91D鎂合金
電化學極化圖……37
圖3-14 CO2_2h_pH11.5_2h試片於室溫下室內放置表面觀察
(a) 原始外觀……38
(b) 一個月……38
(c) 兩個月……38
圖3-15 CO2_2h_pH11.5_2h試片於室溫下戶外放置表面觀察
(a) 原始外觀……39
(b) 一個月……39
(c) 兩個月……39
圖3-16 Mg,Al-hydrotalcite之結構圖……40
圖3-17 CO2_2h試片表面Mg,Al-hydrotalcite前驅物之結構示意圖…41
圖3-18 Mg,Al-hydrotalcite前驅物與Mg,Al-hydrotalcite結構示意圖…42
圖3-19 CO2_2h與CO2_2h_pH11.5_2h之橫截面顯微組織示意圖…43
圖3-20 CO2_2h_pH11.5_2h試片百格測試結果……44
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