文化大學機構典藏 CCUR:Item 987654321/23135
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    题名: Al和Mo在高熵合金(AlxMoyCr12Fe35Mn28Ni20,x+y=5)中對加工量和抗孔蝕性之影響研究
    作者: 林堯文
    贡献者: 化學工程與材料工程學系
    关键词: 高熵合金
    high-entropy alloys
    混和溶液
    mixed solutions
    氯離子
    [Cl-]
    日期: 2012
    上传时间: 2012-10-11 10:10:00 (UTC+8)
    摘要: 本論文是在研究高熵合金AlCrFeMnNi的電化學性質,並添加Mo形成三種成份(AlxMoyCr12Fe35Mn28Ni20,x+y=5,)。實驗使用市售硫酸、氯化鈉、硫酸鈉進行;並在不同的濃度的硫酸及氯化鈉溶液中以恆電流/恆電位儀測量此三種合金在溶液中的極化曲線,來測定其腐蝕電位、臨界電流及腐蝕速率。另外是以不同濃度的硫酸/氯化鈉混和溶液及氯化鈉/硫酸鈉混合溶液,觀察在常溫下混合溶液隨著氯離子的相對變化對於電化學的影響。
    三種高熵合金來說,在同樣濃度的硫酸中,Al1Mo4Cr12Fe35Mn28Ni20之高熵合金略佳;在高濃度的氯化鈉溶液中,三種高熵合金表現差異不大,但在低濃度的氯化鈉溶液中,還是以有添加Mo的Al1Mo4Cr12Fe35Mn28Ni20及Al3Mo2Cr12Fe35Mn28Ni20的表現較好,尤其是含Mo量較高的Al1Mo4Cr12Fe35Mn28Ni20,更能證明Mo對於小孔腐蝕有一定程度的抵抗,但整體而言,此三種高熵合金的抗蝕性都不佳。
    混和溶液的實驗方面,可觀察到隨著氯離子的減少,對於孔蝕的影響就相對減少,由此可知氯離子在孔蝕的發生扮演重要的角色。

    The thesis studied the electrochemical property on the high entropy alloys AlCrFeMnNi, and we synthetized three kinds of the high entropy alloys (AlxMoyCr12Fe35Mn28Ni20,x+y=5) when we added Mo. In the study,we used sulfuric acid,sodium chloride and sodium sulfate;In addition, the polarization curves of these three alloys in sulfuric acid solutions or sodium chloride solutions with different concentrations were also tested for measuring their corrosion potentials and corrosion currents. In addition, we could observe the electrochemical properties of (AlxMoyCr12Fe35Mn28Ni20, x+y=5,) in the room temperature with changing [Cl-] in different concentrations mixed solutions of sulfuric acid/ sodium chloride or sodium chloride/ sodium sulfate.
    Al1Mo4Cr12Fe35Mn28Ni20 is better than another of three in sulfuric acid solution with the same concentration;the three high entropy alloys’ electrochemical properties are near in the high sodium chloride solutions, but in the low sodium chloride solutions Al1Mo4Cr12Fe35Mn28Ni20 and Al3Mo2Cr12Fe35Mn28Ni20 are better especially Al1Mo4Cr12Fe35Mn28Ni20 ,it proved that adding Mo has better corrosion resistance. But three of AlxMoyCr12Fe35Mn28Ni20 were not good in corrosion resistance.
    In mixed solutions studying ,we could know [Cl-] is directly proportional to pitting, and [Cl-] is a important role to pit.
    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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