| 研究生: | 林佳全 Lin, Chuan-Chen | 
|---|---|
| 論文名稱: | 碳鋼及鋼筋在海水環境下腐蝕及機械性質之研究 Corrosion and mechanical property of carbon steel and rebar under the sea water environment | 
| 指導教授: | 蘇演良 Su, Yean-Liang | 
| 學位類別: | 碩士 Master | 
| 系所名稱: | 工學院 - 機械工程學系碩士在職專班 Department of Mechanical Engineering (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: | 107 | 
| 中文關鍵詞: | 鋼筋 、碳鋼 、腐蝕 、海水腐蝕 | 
| 外文關鍵詞: | carbon, rebar, sea water corrosion, corrosion | 
| 相關次數: | 點閱:134 下載:2 | 
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    本文研究以大自然常見的腐蝕行為”海水腐蝕”,探討S20C圓棒和SD28鋼筋在海水中及含海水成份空氣中機械性質的變化。實驗時間為期一年,每三個月實驗一次,並紀錄試棒在不同時間拉伸實驗數據之變化。
    首先探討S20C圓棒及SD28鋼筋在海水及空氣中腐蝕下,其試片重量變化,再藉由拉伸試驗了解拉伸負荷及伸長率的變化,最後再用掃描式電子顯微儀器(M-SEM)探討不同時間,其表面成份原子數量變化和用目視觀察材料表面腐蝕情形。
    結果顯示:碳鋼和鋼筋在空氣中的重量變化不大,但鋼筋在海水中腐蝕重量比碳鋼重量減少較少,(實驗一年後,鋼筋減少約4公克,碳鋼減少約25公克),再觀察碳鋼表面腐蝕情況明顯較鋼筋嚴重,顯示鋼筋比碳鋼更耐腐蝕,主要原因是因為鋼筋材料比碳鋼多出鎳、銅和鉻元素的結果;另外鋼筋和碳鋼在海水的時間愈長,其鐵原子的比例比氧原子來的多。在實驗環境中,海水中及空氣中有受預拉的試棒較沒有預拉過的試棒其抗拉強度值較大,顯示預拉應變所產生較多的差排,因時效作用使得抗拉強度增加。
The research is discussing the natural corrosiveness, sea water corrosiveness, then analyzing with SD28 rebar and S20C carbon steel; also to compare when expose the material in the sea water and in the air, which contains sea water, and compare changes of mechanical character after stress corroded at different times.
Firstly, we discuss testing pieces weight variation after S20C carbon steel and SD28 rebar corroded in sea water; to get to know the changes of their most loaded and extension rate by pulling test. Secondly, we use scanning electron microscope (M-SEM) to know quantity changes of atoms on the surface and to see the corrosive situation on the material surface by eyes at different times.
The results show that: carbon steel and rebar do not have significant weights variance in air, but compare to carbon steel, rebar has less corrode weight reduction in sea water (after one year experiment, weight of rebar reduced about 4 grams and the carbon steel reduced about 25 grams). Furthermore, the observed surface corrode of carbon steel is serious than rebar, and it shows that rebar is more anti-corrode than carbon steel. The main reason for this condition is that the rebar material contains nickel, copper and chromium elements that carbon steel does not have. Besides, the longer the rebar and carbon steel soaked in sea water, the percentage of iron atom will higher than oxygen atom. In the experimental environment, prestressed specimen has higher tensile strength than the specimen without prestressed in sea water and air, and it revealed that more dislocation resulted from pre-stretch strain is due to time-effect function increase the tensile strength.
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