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題 名 | 鐵基形狀記憶合金腐蝕行為之研究=A Study on the Corrosion Behavior of Fe-based Shape Memory Alloys |
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作 者 | 歐陽自明; 林昆明; 林新智; 周棟勝; | 書刊名 | 逢甲學報 |
卷 期 | 37 2000.06[民89.06] |
頁 次 | 頁107-116 |
分類號 | 440.39 |
關鍵詞 | 鐵基形狀記憶合金; 化學腐蝕; 電化學腐蝕; 應力腐蝕; Fe-based shape memory alloy; Chemical corrosion; Electrochemical corrosion; Stress corrosion; |
語 文 | 中文(Chinese) |
中文摘要 | 利用真空感應熔煉法,配製Fe64Mn30Si6(33號)、Fe59Mn30Si6Cr5 (34號)及Fe65Mn13Si5Cr12Ni5(35號)三種合金,施以滾軋處理,而後進行化學浸蝕、電化學腐蝕及應力腐蝕斷裂試驗,以探討合金之抗蝕性。結果顯示,在3.5%NaC1靜滯溶液中,35號合金抗蝕性相當良好,34號合金會造成局部腐蝕,33號合金之腐蝕產物會附著於基材,形成暫時性鈍化現象。在動電位極化試驗中,腐蝕電位高低依序為35號、34號及33號合金。經1000℃、2小時熱處理後,33號合金因表面產生Mn的空乏層,使其腐蝕電位提高;34號合金則因ε麻田散相增加,造成腐蝕電位下降;35號合金腐蝕電位幾乎不變,但因α麻田散相之存在,而形成嚴重之孔蝕。在飽和硫化氫的應力腐蝕斷裂試驗中,35號合金因層狀α麻田散相易於腐蝕,造成抗拉強度明顯下降。 |
英文摘要 | Fe64Mn30Si6, Fe59Mn30Si6Cr5 and Fe65Mn13Si5Cr12Ni5 were prepared by VIM technique. The various corrosion tests were conducted to investigate the corrosion resistance of the alloys. It is found that in 3.5% NaC1 solution, Fe65Mn13Si5Cr12Ni5 has the best chemical corrosion resistance. A local corrosion takes place in Fe59Mn30Si6Cr5. The corrosion product of Fe64Mn30Si6 is adhered tightly on the base material to protect from chemical attack. After being heat-treated at 1000℃ for 2 hrs, the corrosion potential of Fe64Mn30Si6 increases. Fe59Mn30Si6Cr5 becomes more active after heat treatment. The corrosion potential is nearly unchanged in Fe65Mn13Si5Cr12Ni5 after that treatment. But local pitting occurs before it reaches the pitting potential. In the stress corrosion cracking test, Fe65Mn13Si5Cr12Ni5 has the highest fracture stress in the atmosphere, but due to the existence of the α martensite, it causes the largest decrease in the fracture stress in the three alloys. |
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