臺灣博碩士論文加值系統

摘要
鑑於常溫下鐵鋁基合金的環境脆化肇因於水氣，吾人嘗試用熱機處理來改善延性，也有利用表面改質來隔絕水氣以防止氫脆，若將兩者合併使用，或可達到更佳的效果。本研究之目的在對熱機處理後鐵鋁基合金進行各種表面處理，試行在鐵鋁基合金表面形成氧化層或鈍化層，以不同的酸鹼之電解液，及改變濃度、電壓、電流密度及時間等製程參數進行陽極處理，以及化成處理和其他改質處理測試如高溫裝匣來獲得表面改質層，透過拉伸試驗測試來評估以上改質成功者對鐵鋁基合金室溫延性改善之效益，並比較其與高溫氧化層產生保護作用之差異。實驗結果顯示：鐵鋁基合金的室溫陽極處理無法有效產生氧化層，但在極化曲線的測試中得知鐵鋁基合金在氫氧化鈉和磷酸中有鈍化區的存在，可利用此一特性在惰性區採定電位或電流密度的方式或可產生鈍化膜。鋼鐵的化成處理對鐵鋁基合金不適用，Fe28Al系列及含Cr者無法生成附著性高之改質層，僅有Fe18Al的改質層有較佳附著性，經拉伸試驗後發現延伸率並未大幅改善。高溫裝匣氧化層附著性不佳，卻可使拉伸率大幅增加，磨去表面氧化層仍可保持較高的拉伸率，可能是高溫長時間退火導致試片軟化之故。綜合以上，僅高溫裝匣氧化法對鐵鋁基合金有較佳的抗環境脆化效果。

Abstract
Because the environmental embrittlement of Fe-Al alloy in room temperature, several technique have been derived to avoid embrittlement or reduce its severity. These include hot work and surface modification. The purpose of the research is to evaluate the effects of anodizing, blacking and packing on the formation oxide layer of Fe-Al alloy and their mechanical property at room temperature. The experimental results reveal that the anodizing of Fe-Al could not provide an oxide film. In the test of polarization curve, we find that curve shows passivation of Fe-Al in H3PO4 and NaOH. Blacking process is not suitable for Fe28Al and Fe3Al-Cr, because of the combination between oxide layer and substrate. The oxide layer on Fe18Al is successfully combined, but have poor RT elongation. High temperature surface modification have the excellent RT elongation, even greed the oxide layer. It could be the long time annealing resulted in the softness of Fe-Al.

Abstract
Because the environmental embrittlement of Fe-Al alloy in room temperature, several technique have been derived to avoid embrittlement or reduce its severity. These include hot work and surface modification. The purpose of the research is to evaluate the effects of anodizing, blacking and packing on the formation oxide layer of Fe-Al alloy and their mechanical property at room temperature. The experimental results reveal that the anodizing of Fe-Al could not provide an oxide film. In the test of polarization curve, we find that curve shows passivation of Fe-Al in H3PO4 and NaOH. Blacking process is not suitable for Fe28Al and Fe3Al-Cr, because of the combination between oxide layer and substrate. The oxide layer on Fe18Al is successfully combined, but have poor RT elongation. High temperature surface modification have the excellent RT elongation, even greed the oxide layer. It could be the long time annealing resulted in the softness of Fe-Al.

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