研究生: |
陳東宏 Dong - Hong Chen |
---|---|
論文名稱: |
乙醇及硫含量對碳鋼於潮濕空氣之高溫氧化作用 Effect of Ethanol and Sulphur Content on the High-temperature Oxidation of Mild Steel in Moisture Atmosphere |
指導教授: |
王朝正
Chaur-Jeng Wang |
口試委員: |
鄭偉鈞
Wei-chun Cheng 葉宗洸 Zong Guang Ye |
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: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 89 |
中文關鍵詞: | 酒精汽油 、高溫氧化 、硫化 、乙醇 |
外文關鍵詞: | The high temperature is oxidized, Ethanol., Sulphurate, Ethanol fuel |
相關次數: | 點閱:376 下載:2 |
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本研究採用汽車結構用鋼(SAPH440)作為研究基礎材料,採取三階段實驗分析,經由先導實驗及因素作用評估實驗,探討乙醇及硫酸混合溶液於高溫環境中,對汽、機車排氣高溫區所使用材料之高溫氧化作用。最後進行600 oC、650 oC、700 oC、750 oC的空氣- 95 %乙醇蒸汽、空氣-水蒸汽與空氣氣氛之長時間高溫氧化實驗,並藉由顯微組織、質量改變及微觀結構中所測得之金屬損失,進一步探討其腐蝕行為。實驗結果顯示,溫度與氣氛對材料腐蝕特性有明顯的影響,且鋼料受到氣氛中所含之氫、氧元素的影響,其腐蝕反應機制由氧化反應所主導。材料經長時間高溫氧化後,依據氧化皮膜之XRD分析結果,在溫度高於570 oC的氧化會形成由外到內依序為Fe2O3/Fe3O4/FeO三相的氧化皮膜結構;在溫度低於570℃時,由外至內由外至內依序為Fe2O3、Fe3O4。此外,觀察試片於空氣- 95 %乙醇蒸汽、空氣-水蒸汽與空氣三種燃燒高溫腐蝕之腐蝕增重、金屬損失量與皮膜厚度之關係,以空氣- 95 %乙醇蒸汽之高溫腐蝕氣氛影響最大,空氣-水蒸汽氣氛次之,空氣氣氛最小。
The mild steel of SAPH440 used for motorcycle and automobile exhaust pipe was oxidized by an experimentally sequential simulation in a high temperature containing ethanol, sulphur acid with against composition ratio at the temperature of 500oC, 600oC, and 700oC.
An oxidation tests were also performed on the same material by varying an range oxidation temperature of 600 to 750oC with alcohol concentration of 95%. Water vapor and air in the atmosphere chamber may simultaneously oxidize a metal and alloys for a long time exposure. The behavior of oxidation corrosion of the material was investigated by the weight change, the thickness of scale formed, and the microstructure of the sample after the oxidation test.
The experimental results show that the temperature and an atmosphere condition containing hydrogen, oxygen and other oxidant elements had obviously influenced the corrosion characteristic of material. The presence of these elements lead to the main factor in the mechanism of oxidation corrosion. After oxidation test, according to XRD analysis the scale formed and covered of surface material composed of Fe2O3/Fe3O4/FeO at the above 570oC temperature by forming thin membrane. In contrast, at the lower temperature, FeO was not found because FeO had separated into constituents of Fe3O4 and Fe. At the lower temperature of 570oC, Fe2O3 and Fe3O4 were found in the outside and inside of scale formed as corrosion products. In addition, the weight lost increased by thickening of thin membrane of scale to generate corrosion product at a different temperature treatments in the atmosphere containing 95 % ethanol, pure water, and air. Whereas, mechanism of oxidation corrosion just took the second stage and minimum effect for the pure water and air, respectively.
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