黃銅於原子力顯微鏡接觸式量測模式造成之應力腐蝕｜國立臺灣科技大學博碩士論文系統

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研究生：	江景昇 Jing-Sheng Chiang
論文名稱：	黃銅於原子力顯微鏡接觸式量測模式造成之應力腐蝕 The stress corrosion of brass by contact model atomic force microscopy
指導教授：	王朝正 Chaur-Jeng Wang
口試委員:	李志偉 Jyh-Wei Lee 鄭偉鈞 Wei-Chun Cheng
學位類別：	碩士 Master
系所名稱：	工程學院 - 機械工程系 Department of Mechanical Engineering
論文出版年：	2006
畢業學年度：	94
語文別：	中文
論文頁數：	97
中文關鍵詞：	氧化亞銅、孔蝕、黃銅、原子力顯微鏡、腐蝕
外文關鍵詞：	corrosion pits, cuprous oxide, Atomic force microscopy, brass, corrosion
相關次數：	點閱：258 下載：3
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本研究以原子力顯微鏡(AFM)於水溶液環境即時觀察黃銅合金於0.1 wt% 氯化銅水溶液中的腐蝕現象。結合場發射電子微探儀，觀察分析黃銅試片表面於腐蝕時所生成的蝕孔及氧化物，並利用X光繞射儀分析試片表面之腐蝕生成物成分。研究發現，原子力顯微鏡可以即時觀察銅合金於腐蝕溶液中產生奈米等級蝕孔與腐蝕生成物的過程，可用來研究黃銅於氯化銅水溶液受AFM探針影響誘發產生應力腐蝕。當C26000商用黃銅合金於0.1 wt% 氯化銅水溶液中時，試片表面會被侵蝕，因而產生蝕孔，表面生成顆粒狀的Cu2O，其顆粒尺寸與試片表面平均粗糙度(Ra)均隨著腐蝕浸泡時間增加而變大。當AFM探針的作用力施加在試片表面掃描時，探針掃描作用力會誘發應力腐蝕。

The atomic force microscopy (AFM) has been employed to investigate the in-situ corrosion phenomena of the brass immersed in 0.1 wt% CuCl2 aqueous solution. A field emission EPMA is also used to analyze the corrosion pits and corrosion products of brass. The crystalline phases of the corrosion products were examined by an X-ray diffractometer. It is found that the in-situ formation phenomena of corrosion pits and corrosion products on nano scale can be explored by the liquid mode AFM. The initial of stress corrosion reaction and corrosion kinetics of brass induced by the AFM tip in 0.1wt% CuCl2 aqueous solution are also investigated. It is found that the surface of commercial C26000 brass was attacked by the 0.1 wt% cuprous chloride aqueous solution observed by an in-situ AFM. Corrosion pits and Cu2O oxide particle are found on the alloy surface. The particle size and average surface roughness of the specimen increase with immersion time. The stress induced corrosion phenomena is observed when the AFM tip scans on the specimen surface.

第一章 前言	1
第二章 文獻回顧	3
　2.1腐蝕與電化學腐蝕	3
　　2.1.1 熱力學與電極電位	5
　　　2.1.1.1 自由能(Gibbs free energy)	5
　　　2.1.1.2 電極電位與電動勢	6
　　　2.1.1.3 參考電極	7
　　2.1.2腐蝕動力學	9
　　　2.1.2.1電化學極化	9
　　　2.1.2.2 混合電位理論	12
　　　2.1.2.3 腐蝕電位與腐蝕電流	13
　　　2.1.2.4腐蝕速率的量測	16
　2.2 腐蝕反應之形態與機構	17
　　2.2.1 腐蝕形態	17
　　2.2.2 銅合金腐蝕反應機構	19
　　　2.2.2.1 加凡尼腐蝕(Galvanic corrosion)	19
　　　2.2.2.2 穿孔腐蝕(Pitting corrosion)	21
　　　2.2.2.3 間隙腐蝕(Crevice corrosion)	22
　　　2.2.2.4 應力腐蝕(SC)與應力腐蝕破裂(SCC)	22
　　　2.2.2.5 選擇性侵蝕(selective leaching)	28
　2.3 黃銅腐蝕	29
　　2.3.1 銅鋅相圖	29
　　2.3.2 銅合金之特性	30
　　2.3.3 黃銅脫鋅之(dezincification)行為	30
　　2.3.4 環境對脫鋅行為之影響	32
　　2.3.5 脫鋅之理論與防治	33
　2.4 鋅腐蝕	34
第三章 實驗方法	35
　3.1 實驗流程	35
　3.2 實驗材料與試片準備	36
　3.3 測試條件	37
　3.4 實驗分析設備與技術	37
　3.5 原子力顯微鏡分析	39
　3.6 微觀結構及晶相分析	46
　　3.6.1 場發射電子微探儀( FE-EPMA )	46
　　3.6.2 X光繞射分析( XRD , X-ray diffraction )	46
　　3.6.3 腐蝕形態金相觀察(OM)	46
　　3.6.4 場發射電子顯微鏡觀察( FE-SEM )	47
　3.7 電化學實驗	48
　　3.7.1 恆電位儀實驗設備及裝置	48
第四章 實驗結果	52
　4.1試樣原材	52
　4.2浸泡試驗之原子力顯微鏡觀察	54
　　4.2.1力曲線(Forced Curve)分析	54
　　4.2.2 氯化銅(CuCl2)溶液	56
　　　4.2.2.1 大氣環境下原材之AFM表面量測	56
　　　4.2.2.2 AFM連續式掃描	57
　　　　4.2.2.2.1 SEM-EDS觀察	65
　　　　4.2.2.2.2 表面金相觀察	67
　　　　4.2.2.2.3 XRD繞射分析與EPMA定性分析	68
　　　4.2.2.3 AFM間斷式掃描	71
　　4.2.3去離子水(DI water)	74
　4.3 電化學試驗	76
　　4.3.1 動電位極化曲線( Potentiodynamic ) 	76
　　4.3.2 循環極化曲線( Cyclic Polarization ) 	76
　　4.3.3 開路電位對時間曲線	77
　　4.3.4 鐵弗(Tafel)曲線	77
第五章 討論	83
　5.1 電化學試驗	83
　5.2 原子力顯微鏡試驗	85
　5.3 腐蝕反應機構	88
　　5.3.1應力腐蝕(stress corrosion) 	88
　　5.3.2黃銅脫鋅	88
第六章 結論	90
參考文獻	91

                                

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