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    题名: Al7.5Cr22.5Fe35Mn20Ni15高熵合金之微結構及腐蝕特性研究
    The Microstructures and Corrosion behaviors of the Al7.5Cr22.5Fe35Mn20Ni15 High Entropy Alloy
    作者: 李柏彥
    Lee, Po-Yen
    贡献者: 化學工程與材料工程學系奈米材料碩士班
    关键词: 高熵合金
    電化學
    High Entropy Alloy
    electrochemical
    日期: 2013-06
    上传时间: 2013-10-21 10:40:08 (UTC+8)
    摘要: 本論文主要在研究Al7.5Cr22.5Fe35Mn20Ni15高熵合金之微結構及腐蝕特性。結果顯示，Al7.5Cr22.5Fe35Mn20Ni15高熵合金的基地為BCC結構，而內有HCP結構之析出物，因此會有析出強化效應。另外，本論文以恆電流/恆電位儀測量高熵合金在1M硫酸、硝酸、鹽酸、氯化鈉以及1M硫酸再分別添加1M氯化鈉、0.1M氯化鈉、0.01M氯化鈉混合之溶液中不同溫度下的極化曲線，來測定其腐蝕電位、腐蝕電流、鈍態區間電位，並與市售304不銹鋼做比較。
    實驗中利用掃描式電子顯微鏡(SEM)去觀察腐蝕後孔洞形貌以及使用EDS去分析合金孔洞以及表面的成分。
    電化學實驗結果顯示，高熵合金置於不同溫度下之7種溶液中，腐蝕電流及腐蝕電位雖沒有明顯變化，但隨著溶液溫度的提高，鈍態區電流會向右偏移，而鈍態區也會隨之減少。Al7.5Cr22.5Fe35Mn20Ni15合金在滾壓後狀態之腐蝕電位以及鈍態區間電位皆優於304不銹鋼。
    This thesis studied the electrochemical properties of the Al7.5Cr22.5Fe35Mn20Ni15 high entropy alloy. The results indicated that all the matrix of the high entropy alloy was a BCC structure. We also observed some HCP-structured precipitates in the matrix of this alloy; and this alloy, therefore, had precipitation strengthening effect after annealed. Furthermore, the polarization curves the alloy was tested under four different temperatures (30˚C, 40˚C, 50˚C, and 60˚C) of 1M H2SO4、1M HNO3、1M HCl、1M NaCl、1M H2SO4+1M NaCl、1M H2SO4+0.1M NaCl and 1M H2SO4+0.01M NaCl solution. After that, this experiment analyzed corrosion potentials, corrosion currents, and their passive range. All these results were also compared with the properties of commercial 304 stainless steel.
    This study also used the field emission scanning electron microscope (SEM) with EDS to observe the morphology and pitting holes and analyze the composition of alloy.
    The corrosion potentials and currents of this alloy did not change significantly in these seven solutions under different temperatures. However, the currents of passive regions would gradually increase while the temperatures increased. In addition, the passive currents and potentials of this alloy were all better than that of commercial 304 stainless steel.
    显示于类别:[化學工程與材料工程學系暨碩士班] 博碩士論文

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