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研究生： 林欣慧
Lin, Hsin-Hui
論文名稱： 金屬鍍層及組裝壓力對燃料電池中316L不銹鋼雙極板的電化學性質影響之研究
Effects of Metal Coating and Clamping Pressure on the Electrochemical Behavior of 316L Stainless Steel Bipolar Plate in Simulated Fuel Cell Environment
指導教授： 蔡文達
Tsai, Wen-Ta
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2010
畢業學年度： 98
語文別： 中文
論文頁數： 84
中文關鍵詞： 不銹鋼 、玻璃金屬 、雙極板 、組裝壓力
外文關鍵詞： stainless steel, glassy metal, bipolar plate, clamping pressure
相關次數： 點閱：84  下載：2 
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    • 在本研究中以316L不銹鋼作為金屬基板，採用物理氣相蒸鍍（Physical Vapor Deposition, PVD）沈積玻璃金屬鍍層及純金屬鍍層於基板上，研究不同金屬鍍層在模擬燃料電池電解質(1 MH2SO4水溶液)的電化學行為，鍍層型態分為(一)以Zr52.4Cu32.2Al8.4Ni7非晶質合金為鈀材之鍍膜，以及(二)以純金屬為鈀材之奈米多層鍍膜。將各種含有鍍膜的試片在燃料電池模擬電解質(即1 MH2SO4水溶液)中進行交流阻抗以及極化曲線等電化學測試，藉此了解上述鍍層的電化學性質及腐蝕現象。研究結果發現：以純金屬為鈀材之奈米多層膜鍍層的抗蝕性優於以Zr52.4Cu32.2Al8.4Ni7非晶質合金為鈀材之鍍層，前者抗蝕性高的原因主要是純ZrO2鈍化膜可以在試片表面上生成，而後者試片表面之鈍化膜除了ZrO2尚有其他氧化物。
    本研究亦探討組裝壓力對於316L不銹鋼電化學性質的影響，在模擬燃料電池的特殊測試系統中於模擬電解質(即1M H2SO4水溶液)中進行交流阻抗以及極化曲線等電化學測試，藉此了解不同組裝壓力對電化學性質及腐蝕現象的影響。研究結果發現，(一)以一般玻璃槽開放測試系統與模擬燃料電池之封閉測試系統相比，後者的極化阻抗較大且鈍化電流較小，其原因主要來自於電解液導電性質變化以及質傳效果改變的關係；(二)在不同壓力下所測得之極化阻抗皆呈現往第四象限壓縮的現象，可能是壓力下電極表面不均勻的電化學反應所致，且隨著壓力上升，極化阻抗有下降的趨勢。

    In this investigation, 316L stainless steel (SS) was used as the bi-polar plate substrate. Two types of coating were applied on the substrate using physical vapor deposition technique. The coatings were single layer of Zr52.4Cu32.2Al8.4Ni7 amorphous metal (NG) and nano-multilayered pure metals(NMZr), respectively. The polarization behaviors of the above coated specimens were investigated in 1M H2SO4 solution by conducting potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The experimental results showed that the nano-multilayered coating had a high polarization resistance than the Zr52.4Cu32.2Al8.4Ni7 amorphous coating. The difference in polarization resistance was determined by the chemical composition of the passive films formed on different coated electrodes.
    This study also investigate the effect of clamping pressure (0.1~1.0MPa) on electrochemical behavior of 316L SS. The electrochemical behavior of 316L SS proceeding in fuel cell-simulating testing cell was investigated in 1M H2SO4 solution by conducting potentiodynamic polarization and EIS tests. The experimental results showed that (1) the higher polarization resistance and smaller passive current density in fuel cell-simulating testing cell. The result comes from the lower electric conductivity in fuel cell-simulating testing cell, (2) the semi-circle for the Nyquist plot of different clamping pressure was depressed downward, because of the un-uniform electrochemical reaction on the surfaces under clamping pressure. The results of EIS reveal that the polarization resistance decreased obviously with the increase of clamping pressure.

    中文摘要 I Abstract II 誌謝 III 總目錄 V 表目錄 VIII 圖目錄 IX 第一章 前言 1 第二章 理論基礎與文獻回顧 2 2.1 燃料電池原理及種類 2 2.1.1 高分子電解質膜燃料電池雙極板 5 2.1.2 雙極板的種類與發展 7 2.2 材料的電化學性質 12 2.2.1 316L不銹鋼之電化學性質 12 2.2.2 玻璃金屬之抗腐蝕性質 13 2.2.3 金屬在硫酸水溶液中的腐蝕行為 14 2.2.3.1 鋯在硫酸水溶液中的腐蝕行為 14 2.2.3.2 銅在硫酸水溶液中的腐蝕行為 15 2.2.3.3 鋁在硫酸水溶液中的腐蝕行為 15 2.2.3.4 鎳在硫酸水溶液中的腐蝕行為 16 2.3 壓力對電化學性質的影響 17 2.3.1 組裝壓力對PEMFC電性的影響 17 2.3.2 液壓對電化學性質的影響 18 2.3.3 電化學勢與電化學活性的力學效應 19 2.3.4 金屬電極電位的力學效應 21 第三章 實驗方法與步驟 25 3.1 金屬鍍層的電化學性質研究 25 3.1.1 試片組成及製備 25 3.1.2 結晶結構分析 25 3.1.3 電化學性質研究 26 3.1.4 腐蝕表面形貌觀察及成分分析 27 3.2 不同組裝壓力對316L不銹鋼的電化學性質研究 30 3.2.1 電化學性質研究 30 3.2.2 腐蝕表面形貌觀察及成分分析 31 第四章 結果與討論 36 4.1 玻璃金屬鍍層的電化學性質 36 4.1.1 結晶結構分析 36 4.1.2 金屬鍍層試片的電化學測試 37 4.1.2.1 動電位極化測試 37 4.1.2.2 交流阻抗測試 38 4.1.3 腐蝕表面形貌觀察及成分分析 39 4.2 不同系統之316L不銹鋼的電化學性質分析 52 4.2.1 交流阻抗曲線的表現 52 4.2.2 動電位極化曲線的表現 53 4.2.3 定電位後的表面形貌觀察 54 4.3 壓力對於316L不銹鋼的電化學性質的影響 65 4.3.1 交流阻抗曲線的表現 65 4.3.2 動電位極化曲線的表現 66 4.3.3 定電位後的表面形貌觀察 67 第五章 結論 78 參考文獻 80

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