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研究生： 蘇傑璋
Su, Chieh-Chang
論文名稱： 羥丙基甲基纖維素鄰苯二甲酸酯與醋酸羥丙基甲基纖維素琥珀酸酯塗層的抗腐蝕及耐久特性研究
Anti-corrosion and durability performance of hydroxypropyl methylcellulose phthalate and hydroxypropyl methylcellulose acetate succinate coating
指導教授： 施士塵
Shi, Shih-Chen
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2017
畢業學年度： 105
語文別： 中文
論文頁數： 49
中文關鍵詞： EIS 、HPMCP 、HPMCAS 、溶脹 、腐蝕機制
外文關鍵詞： EIS, HPMCP, HPMCAS, Swelling, Corrosion mechanism
相關次數： 點閱：69  下載：7 
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    • 使用羥丙基甲基纖維素鄰苯二甲酸酯（hydroxypropyl methylcellulose phthalate，簡稱HPMCP）和醋酸羥丙基甲基纖維素琥珀酸酯（hydroxypropyl methylcellulose acetate succinate，簡稱HPMCAS），這是羥丙基甲基纖維素（hydroxypropyl methylcellulose，簡稱HPMC）的延伸物，並且同時都具有生物可分解性，是個對生物友善的材料。這兩種材料與HPMC最大的不同在於位於酸性溶液中的溶解度，正因為這個特性，本文想研究出當HPMCP與HPMCAS在高速鋼上形成塗層後，在不同酸鹼值的溶液中以及不同的浸泡時間的耐久性抗腐蝕測試。測試包含動電位極化法測試（potentiodynamic polarization）還有電化學阻抗頻譜（Electrochemical Impedance Spectroscopy，簡稱EIS）。HPMCP測試的結果，約在浸泡8小時之後，材料的抗腐蝕效果會達到最差的階段，再持續地浸泡下去達24小時，反而抗腐蝕效果會回復到比8小時更好的情況。這方面是因為HPMCP塗層浸置在溶液中產生一些水的通道，使得在高速鋼與塗層之間產生了一些鐵的氧化物，得以提升抗腐蝕效果。HPMCAS的測試結果與前面不同，在浸泡的前半段抗腐蝕效果和預期不同地漸漸上升，在後半段再開始下降，這裡是因為HPMCAS塗層會發生溶脹現象，剛開始浸置在溶液中，塗層會吸水發生溶脹並產生凝膠層，當吸收到極限之後，原本的屏障會出現更多的吸水路徑而使抗腐蝕效果下降。

    In this research, hydroxypropyl methylcellulose phthalate (HPMCP) and hydroxypropyl methylcellulose acetate succinate (HPMCAS), which are the derivatives of hydroxypropyl methylcellulose (HPMC) as well as bio-friendly materials were used for coating on high-speed steel (HSS) to protect HSS in acid condition. Anti-corrosion property of HPMCP and HPMCAS in acid solutions with different pH and different immersing time was studied, and the electrochemical behavior was evaluated by potentiodynamic polarization and by electrochemical impedance spectroscopy (EIS).
    Experimental result for HPMCP coating after 8 hours immersing, showing the worst anti-corrosion performance; however, the material shows better anti-corrosion performance after 24 hours immersing than 8 hours, which may due to the slightly improvement of anti-corrosion property provided by iron oxides. Thus, it is inferred that the corrosion mechanism is the generation of water paths followed by the formation of iron oxides between the HSS and HPMCP coating.
    HPMCAS is totally different than HPMCP. At the low immersing time, the anti-corrosion property of HPMCAS is improved as time increase. After turning point, the anti-corrosion property of HPMCAS is weakened as time increase. The mechanism is swelling, by absorbing water and swelling, and coating change into gel layer gradually. When the adsorption reach the limit, coating generates more water paths, result in the weakened of anti-corrosion property. Also, HPMCAS coating shows the best anti-corrosion performance at pH = 3.

    口試合格證明 I 摘要 II Extended Abstract III 誌謝 X 總目錄 XI 表目錄 XIII 圖目錄 XIV 第1章 緒論 1 1-1 前言 1 1-2 研究動機 2 第2章 文獻回顧 3 2-1 羥丙基甲基纖維素之衍生物 3 2-2 高分子聚合物在腐蝕中的運用 6 2-3 動電位極化法 10 2-4 電化學阻抗頻譜（EIS） 12 第3章 實驗方法與步驟 15 3-1 實驗目的 15 3-2 實驗簡介 15 3-3 實驗流程 16 3-4 實驗方法 17 3-4-1 實驗基板準備與前處理 17 3-4-2 以溶劑蒸發法製備HPMCP和HPMCAS塗層 17 3-4-3 動電位極化法測試 18 3-4-4 電化學阻抗頻譜 20 3-4-5 拉曼光譜分析 21 3-4-6 厚度分析 21 3-4-7 溶脹現象分析實驗 22 3-5 實驗設備 22 第4章 實驗結果與討論 23 4-1 HPMCAS 23 4-1-1 動電位極化法 23 4-1-2 電化學阻抗頻譜 24 4-1-3 實驗結果討論與提出腐蝕機制假說 28 4-1-4 拉曼光譜分析 29 4-1-5 厚度分析 30 4-1-6 相對含水量分析 31 4-1-7 溶脹現象分析實驗 33 4-2 HPMCP 34 4-2-1 動電位極化法 34 4-2-2 電化學阻抗頻譜 35 4-2-3 實驗結果討論與提出腐蝕機制假說 39 4-2-4 拉曼光譜分析 40 4-2-5 厚度分析 41 4-2-6 相對含水量分析 42 4-3 HPMCAS與HPMCP之綜合比較 43 第5章 總結 44 5-1 結論 44 5-2 未來方向展望 45 參考文獻 46

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