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研究生： 許樂仁
Hsu, Lo-Jen
論文名稱： 304不銹鋼含硫量對孔蝕影響之研究
Effect of Sulfur Content on Pitting Corrosion of 304 Stainless Steel
指導教授： 蔡文達
Tsai, Wen-Ta
孫亦文
Sun, I-Wen
學位類別： 碩士
Master
系所名稱： 理學院 - 化學系碩士在職專班
Department of Chemistry (on the job class)
論文出版年： 2003
畢業學年度： 91
語文別： 中文
論文頁數： 82
中文關鍵詞： 腐蝕電位 、孔蝕起使電位 、過鈍化電位 、孔蝕保護電位 、臨界電流密度 、鈍化電流密度
外文關鍵詞： Enp, Ecorr, Etr, Epp, Ic, Ip
相關次數： 點閱：136  下載：2 
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    • 本研究主要是以電化學量測方法、探討硫酸、硝酸、鹽酸及氯化鈉離子溶液對奧斯田鐵不銹鋼(含硫量0.001%、0.002%、0.005%、0.010%)中之孔蝕性質的影響。並以OM、SEM、EDS觀察分析孔蝕深度、孔蝕型態和元素成份。
    由實驗結果顯示在硫酸、硝酸水溶液中,並無發現孔蝕現象,鹽酸及氯化鈉水溶液中有孔蝕產生。
    在硫酸、硝酸水溶液中,陽極鈍態區電流密度隨不銹鋼中硫含量之增加而提高。
    在鹽酸水溶液中, 鈍態區電流密度亦隨不銹鋼中硫含量之增加而提高且鈍態區之範圍隨之縮小。在此水溶液中,於極化曲線量測後304不銹鋼表面有孔蝕生成。
    在氯化鈉水溶液中經極化曲線量測後304不銹鋼表面皆有孔蝕發生而孔蝕起始電位與304不銹鋼之硫含量沒有明顯關係,此乃因本研究之304不銹鋼中之介在物密度很高有關。

    Effects of sulfuric acid, nitric acid, hydrochloride acid and sodium chloride ions on pitting corrosion of SUS 304 stainless samples(contain 0.001%, 0.002%, 0.005%, 0.010% sulfur) were investigated by electrochemical and surface analytical techniques such as potentiodynamic polarization curves. Examination of the surface corrosion morphology and analysis of the chemical composition, deep in pits.
    The results show that no pit was observed in sulfuric acid and nitric acid but in hydrochloride acid and sodium chloride solutions, a pit in the specimen was observed.
    In sulfuric acid and nitric acid anodic passive area of current density is increased as stainless steel sulfur content increasing.
    In hydrochloride acid passive area of current density is also risen as stainless steel sulfur content increasing, but the range of passive area will be decreased. In the solution after the polarization, we can find the pitting corrosion on the surface of the 304 stainless steel.
    At the sodium chloride solution , 304 stainless steel surface showed pitting corrosion when measure the polarization cure. Pitting initiated potential is no relationship with the 304 stainless steel contains sulfur because in the research the 304 stainless steel contain very high inclusion.

    總目錄 中文摘要 I 英文摘要 II 誌謝 …………………………………………………………….. III 總目錄 IV 表目錄 …………………………………………………………..VII 圖目錄 …………………………………………………………VIII 符號說明 ………………………………………………………XIII 第一章 前言 1 第二章 相關理論及文獻 3 2-1 孔蝕簡介 3 2-2 孔蝕理論 4 2-3 溶液離子成分的影響 6 2-4 pH值的影響 8 2-5 不銹鋼合金元素的影響 8 2-6 孔蝕測試方法 9 第三章 實驗原理與實驗步驟 11 3-1 材料來源 11 3-2 試片準備與製作 11 3-3 電化學測試 12 3-3-1 動電位極化曲線量測 12 3-3-2 定電位測試 13 3-4 表面觀察及分析 13 第四章 結果與討論 15 4-1 電化學極化現象及OM、SEM、EDS測試結果 15 4-1-1硫含量對304不銹鋼在硫酸水溶液中的電 化學行為影響 …15 4-1-2 硫含量對304不銹鋼在硝酸溶液中的電 化學行為影響 ….15 4-1-3硫含量對304不銹鋼在鹽酸溶液中的電化 學行為影響 ….16 4-1-4 氯化鈉濃液中pH值對孔蝕的影響 17 4-1-4-1 pH=2 0.3M氯化鈉離子濃度對304 不銹鋼(含硫量0.001%、0.002%、 0.005%、0.010%)的電化學及顯微 組織性影響 17 4-1-4-2 pH=7氯化鈉離子濃度對304不銹鋼 (含硫量0.001%、0.002%、0.005%、 0.010%)的電化學及顯微組織性影響18 4-1-4-3 pH=12氯化鈉離子濃度對304不銹 鋼(含硫量0.001%、0.002%、0.005% 、0.010%)的電化學及顯微組織性影 響 19 4-1-5 不銹鋼於0.3M NaCl室溫溶液下，孔蝕起 始電位Enp之探討 22 4-2 304不銹鋼試片介在物之影響檢討 ….22 第五章 結論 25 第六章 參考文獻 27自述 31

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