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研究生:黃農晏
研究生(外文):Nong-YanHuang
論文名稱:大氣腐蝕加速試驗對含稀土元素耐候鋼銹層影響研究
論文名稱(外文):Material characterization of the corrosionproducts forms on rare earth metal containingweathering steels after accelerated atmosphericcorrosion tests
指導教授:蔡文達蔡文達引用關係
指導教授(外文):Wen-Ta Tsai
學位類別:碩士
校院名稱:國立成功大學
系所名稱:材料科學及工程學系碩博士班
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:105
中文關鍵詞:耐候鋼鹽霧乾溼循環試驗烘烤處理實驗室加速大氣腐蝕模擬
外文關鍵詞:weathering steelwet/dry alternating exposure testbaking treatmentaccelerated atmospheric corrosion test
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本研究以模擬大氣腐蝕條件的加速試驗;探討稀土元素之耐候鋼的大氣腐蝕性質,利用X光繞射儀(XRD)、掃瞄式電子顯微鏡(SEM)和能量散佈光譜儀(EDS)等儀器分析銹層的性質,以瞭解銹層演化的過程及生成機制。此外,亦利用動電位極化曲線評估耐候鋼銹層在模擬的大氣條件下的相對穩定度。

  試驗結果顯示,稀土元素添加量為0.0016 wt% 之耐候鋼於0.05 wt% NaCl水溶液中有最低的腐蝕電位。於0.05 wt% NaCl水溶液進行鹽霧乾溼循環試驗後,腐蝕產物組成為γ-FeOOH、Fe3O4和α-FeOOH;銹層橫截面形貌發現有內外銹層存在結構和元素分佈差異。

稀土耐候鋼於0.05 wt% NaCl水溶液進行鹽霧乾濕循環試驗後,再經過150oC烘烤15天後,腐蝕產物由結晶相轉變成非晶質相及Fe3O4,銹層缺陷顯著減少,且銹層與基材介面的附著性獲得提升。

稀土耐候鋼於0.05 wt% NaCl水溶液進行鹽霧乾溼循環試驗,經150 oC烘烤15天後,再加以反覆鹽霧乾溼循環試驗,腐蝕產物由非晶質相再度轉變成結晶相,銹層的緻密性變佳,銹層與基材介面的附著性大幅的提升。最後將經過不同大氣腐蝕模擬試驗後之稀土耐候鋼,於0.05 wt% NaCl水溶液中進行動電位極化曲線,結果顯示,隨著不同大氣腐蝕模擬試驗條件的進行,可以提高銹層的穩定度。

The chemical compositions and structures of the rusts formed on the surfaces of rare earth (RE) containing weathering steels, after laboratory-accelerated test, with and without baking treatment, were characterized using XRD、SEM and EDS. Potentiodynamic polarization curve measurement was employed to evaluate the stability of the rust formed under different condition. The effect of rare earth element on the atmospheric corrosion resistance was explored.

The experimental results showed that the bare steel containing 0.0016 wt% RE had the lowest corrosion potential in 0.05 wt% NaCl solution. After cyclic wet/dry alternating exposure in the fog containing 0.05 wt% NaCl solution, the as-formed rust consisted of α-FeOOH、γ-FeOOH and Fe3O4, while the inner and outer scales had different chemical composition and structure.

Further baking treatments at 150oC for 15 days, the rust underwent phase transformation from crystalline to amorphous phase and Fe3O4. In addition, the pore density decreased and the adhesion strength between the substrate and the rust increased.

Further wet-dry cyclic exposure after baking treatment caused the transformation of the rust from amorphous to crystalline phase again. A more compact and good adherence between the substrate and rust was obtained. The potentiodynamic polarization curves of various steels determined in 0.05 wt% NaCl solution could be used to evaluate the relative stability of the rusts formed under different exposure conditions.

摘要 I
Abstract III
誌謝 V
總目錄 VII
表目錄 X
圖目錄 XI
第一章、前言 1
第二章、基礎理論與文獻回顧 3
2.1大氣腐蝕與實驗室加速試驗 3
2.2 耐候鋼 6
2.3合金元素 7
2.4 稀土元素 9
2.5 銹層結構與化學組成 12
2.5.1 銹層結構 13
2.5.2 銹層生成機理 16
2.5.3 銹層生成影響因素 19
2.5.4 銹層保護機理 20
2.6 白金指標 22
第三章、實驗步驟 35
3.1 實驗材料 35
3.2大氣腐蝕模擬暴露試驗 35
3.2.1 試片製備 35
3.2.2 實驗系統 35
3.3 重量損失分析 37
3.4 銹層結構分析 37
3.5 銹層形貌和化學組成分析 38
3.6電化學性質測試 38
3.6.1 實驗系統 38
3.6.2 動電位極化曲線測試 38
第四章、結果 43
4.1 鹽霧乾溼循環試驗的影響 43
4.1.1重量損失分析 43
4.1.2銹層結構分析 43
4.1.3銹層形貌和化學組成分析 44
4.1.4電化學性質測試 45
4.2 烘烤處理的影響 46
4.2.1銹層結構分析 46
4.2.2銹層形貌和化學組成分析 46
4.2.3電化學性質測試 47
4.3 雙循環鹽霧乾溼循環試驗的影響 48
4.3.1重量損失分析 48
4.3.2銹層結構分析 48
4.3.3銹層形貌和化學組成分析 49
4.3.4電化學性質測試 50
第五章、討論 68
5.1銹層保護性 68
5.2烘烤處理的影響 71
5.3稀土元素的影響 74
5.4銹層結構 77
5.5綜合討論 81
第六章、結論 98
第七章、參考文獻 99

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