香草醛在含50 V% 乙二醇低氯離子溶液中對AA6060鋁合金之腐蝕抑制研究

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陳建甫(Chen Jian-Fu) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

香草醛在含50 V% 乙二醇低氯離子溶液中對AA6060鋁合金之腐蝕抑制研究
(Corrosion inhibition of AA6060 with vanillin in dilute chloride solutions of 50 V% ethylene glycol)

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摘要(中)

本論文探討鋁合金6060(AA6060)於40℃、50℃、60℃以及70℃之50 V%乙二醇水溶液中，利用氯化鈉( 2.5 x 10-5 , 5.0 x 10-4, 5.0 x 10-3, 5.0 x 10-2 M)調配腐蝕環境並以生物可降解之香草醛作為腐蝕抑制劑之可行性量測，論文以三極式電化學法(線性極化、Tafel極化、交流阻抗)來量測不同條件參數(如:抑制劑濃度、溫度、氯化鈉濃度等)對鋁合金6060腐蝕抑制效率的影響。電化學實驗後鋁合金6060之則採用SEM、AFM進行表面形貌觀察，FTIR以分析香草醛的吸附狀態及XPS進行腐蝕生成物的探討。
重量損失法以及電化學量測實驗結果均顯示，添加香草醛腐蝕抑制劑濃度為1.0 x 10-6 M時有最佳之抑制效率，在氯離子含量5.0 x 10-4 M時抑制效率達到68.44%。隨著腐蝕液環境之溫度上升以及氯化鈉濃度增加下，抑制劑之抑制效率有下降趨勢。由Tafel極化法顯示，香草醛屬於混合型抑制劑。此類抑制劑在鋁合金上呈現Langmuir等溫吸附模式之吸附。根據Arrhenius方程式求出:不含抑制劑時鋁合金遭受腐蝕之活化能為34.19(KJ/mol)，當抑制劑添加後，其活化能上升。

摘要(英)

This study examines the use of vanillin for improveing of corrosion resistance of aluminum alloy 6060 (AA6060) alloy in 50 V% ethylene glycol solution contains different levels of chlorine ions( 2.5 x 10-5 , 5.0 x 10-4, 5.0 x 10-3, 5.0 x 10-2 M) at different environment temperature(40℃,50℃,60℃,70℃).
Weight loss, Tafel polarization, linear polarization resistance and electrochemical impedance spectroscopy measurements were employed to study the corrosion behavior of AA6060 alloy. All the experiments were carried out in a standard three-electrode cell where a platinized titanium mesh was the counter electrode and an Ag/AgCl electrode was a reference.
Tafel polarization that is used to measure areas of corrosion rate and inhibitor effectiveness. The electrochemical measurements for AA6060 alloy in test solutions showed that the presence of chlorine ion significantly increases the corrosion rates, corrosion current densities (Icorr), simultaneously decreases the values of polarization resistance (Rp). The inhibition efficiency increases significantly with increasing of tiny vanillin concentration. The analysis of SEM & AFM confirmed the formation of precipitates of vanillin on the metal surface, which reduced the overall corrosion reaction. XPS to investigate surface corrosion of the structure of the resultant , FTIR analysis of adsorbed layer bonding state.
Tafel polarization method showed that the vanillin are mixed type inhibitors. Vanillin showing the adsorption of the Langmuir isotherm model in this environment. Accordance to the electrochemical results show that corrosion environment contain tin vanillin changes its effectiveness in preventing passivity loss for AA6060 in chloride media.

關鍵字(中)

★ 鋁合金
★ 電化學
★ 腐蝕
★ 抑制劑

關鍵字(英)

★ corrosion inhibitors
★ electrochemistry
★ aluminum alloys

論文目次

目錄
摘要 I
Abstract V
目錄 VII
參考文獻 XII
表目錄 XIII
圖目錄 XV
第一章緒論 1
1-1 前言 2
1-2 腐蝕抑制劑簡介 2
1-3 研究方向與實驗架構 3
第二章理論背景與文獻回顧 5
2-1 鋁的基本物理化學特性 5
2-2 腐蝕抑制劑之特性與分類 6
2-2-1 腐蝕行為與防蝕 6
2-2-1-1 氯離子的角色 7
2-2-1-2 腐蝕抑制劑與侵蝕離子間之競爭吸附性 8
2-2-2 腐蝕抑制劑抑制方式與選擇 8
2-2-3 腐蝕抑制劑之分類 9
2-2-3-1 物理化學分類 9
2-2-3-2 電化學極化分類 12
2-3 抑制劑吸附理論與活化能 13
2-3-1 抑制劑吸附理論 13
2-3-2 活化能與自由能 14
2-4 電化學測試法之原理與相關理論 15
2-4-1 開路電位(Open circuit potential) 15
2-4-2 線性極化(Linear polarization) 15
2-4-3 動態極化(Potentiodynamic polarization)之Tafel掃描 16
2-4-4 交流阻抗頻譜法(Electrochemical Impedance Spectroscopy) 17
2-4-5 等效電路圖及模擬 18
2-4-6 Nernst Equation與電位-pH圖(Potential-pH Diagram) 19
第三章實驗方法及步驟 22
3-1 試片選擇與規格 22
3-2 試片製作與溶液配製 22
3-3 腐蝕抑制劑選用 23
3-4 重量損失法實驗 23
3-5 電化學實驗 24
3-5-1 開路電位 24
3-5-2 線性極化測試 24
3-5-3 Tafel極化測試 25
3-5-4 交流阻抗測試 25
3-6 表面分析儀器 25
3-6-1 傅立葉紅外線光譜儀 (FTIR) 25
3-6-2 光電子/歐傑電子能譜儀 (Auger/ESCA) 26
3-6-3 原子力顯微鏡 (Atomic Force Microscopy) 26
3-6-4 場發射掃描式電子顯微鏡 (Field Emission Scanning Electron Microscope) 26
第四章實驗結果 27
4-1 香草醛腐蝕抑制劑抑制效率測試 27
4-1-1 重量損失法 27
4-1-2 線性極化法 27
4-1-3 Tafel極化法 28
4-1-4 交流阻抗頻譜分析(EIS) 與等效電路模擬 28
4-2 香草醛腐蝕抑制劑安定性分析 29
4-2-1 氯離子濃度效應 29
4-2-2 溫度影響 29
4-2-3 活化能與吸附型態 30
4-3 表面分析 31
4-3-1 SEM表面分析 31
4-3-2 AFM表面分析 32
4-3-3 FTIR表面分析 33
4-3-4 XPS表面分析 34
4-4 腐蝕溶液分析 34
4-4-1 導電度分析 34
4-4-2 酸鹼度分析 35
第五章討論 36
5- 1 香草醛抑制劑抑制效率討論 36
5- 2 香草醛抑制劑安定性討論 37
5-2-1 氯離子影響 37
5-2-2 溫度影響 38
5-2-3 香草醛濃度影響 39
5-3 表面分析 39
5-3-1 表面形貌分析討論 39
5-3-2 FTIR分析討論 39
5-3-3 XPS分析討論 40
第六章結論 41

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指導教授

林景崎(Lin Jing-Chie)

審核日期

2012-7-10

推文