不同尺寸及形狀的304不銹鋼對電化學除污去除其氧化物的影響

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研究生：	王復生 Wang, Fu-Sheng
論文名稱：	不同尺寸及形狀的304不銹鋼對電化學除污去除其氧化物的影響 The effect of different sizes and shapes of 304 Stainless Steels on the oxide removal by electrochemical decontamination
指導教授：	葉宗洸 Yeh, Tsung-Kuang
口試委員:	藍貫哲 Lan, Kuan-Che 王立華 Wang, Li-Hua
學位類別：	碩士 Master
系所名稱：	原子科學院 - 工程與系統科學系 Department of Engineering and System Science
論文出版年：	2023
畢業學年度：	112
語文別：	中文
論文頁數：	89
中文關鍵詞：	電化學、除污、核電廠除役
外文關鍵詞：	Electrochemical, Decontamination, Decommission
相關次數：	點閱：65 下載：0
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核電廠除役後其組件因受到放射性汙染，無法以一般廢棄物回收，因此需要透過以除污進行處理使組件放射性活度低於標準後方能正常回收。其中電化學除污是一種常用的除污方法。本研究通過重量損失、單位面積重量損失和厚度變化研究了不同尺寸和形狀的304不銹鋼的電化學除污效率。實驗中透過高溫爐高溫氧化法以及電鍍模擬沸水式反應爐運行環境在304不銹鋼上產生的氧化膜，包括基材自身腐蝕形成的內層氧化膜以及透過沉積外部活化腐蝕產物產生的外層氧化層。本研究通過直流電源在磷酸水溶液中電解進行除污。直流電源的正極接試片為陽極，直流電源的負極接白金網為陰極。在 30°C 下向系統施加電流進行除污。
結果表明，在定電流的情況下當試片面積增加時，重量損失也會增加。但相對的單位面積重量損失會降低，厚度變化也降低。當試片的形狀從平板變為管狀時。重量損失、單位面積重量損失和厚度變化均降低。而在相同電流密度下大面積試片與小面積試片的單位密度重量損失以及厚度變化都非常相近。

Electrochemical decontamination is one of the commonly adopted techniques during decontamination of radioactive wastes. The efficiency of electrochemical decontamination on Type 304 stainless steel(304SS) samples with different sizes and shapes was studied in this experiment through weight loss, specific weight loss, and thickness change. Two-layer oxide films on the samples were prepared, with an inner layer simulating oxides formed in boiling water reactor environments, and an outer layer simulating foreign corrosion product deposition. Decontamination processes were carried out by electrolysis in phosphoric acid through a DC power supply. The positive electrode of the DC power supply was connected to the sample as the anode, and the negative electrode of the DC power supply was connected to a platinum mesh as the cathode. A direct was applied to the system at 30°C.
The results show that under the constant current when the area of the specimen increased, the weight loss also increased. In the meantime, the specific weight loss decreased and the thickness change also decreased. When the shape of the sample changed from a flat disk to a sectioned tube, the weight loss, specific weight loss, and thickness change all decreased. Under the constant current density condition, the specific weight change and the thickness change of large-area specimens and small-area specimens are very similar.

摘要    i
Abstract    ii
目錄    iii
表目錄    vi
圖目錄    vii
第一章 緒論    1
1 研究背景    1
2 研究目的    2
第二章 基礎理論與文獻回顧    4
1 核能發電廠基本介紹    4
1.1 發電原理    4
1.2 核電廠分類    5
1.3 BWR核電廠組件材料簡介    10
1.4 BWR核電廠金屬組件氧化層結構    11
1.5 BWR核電廠放射性物質來源    12
2 各類除污技術簡介    12
2.1 物理除污法[12][13]    13
2.2 化學除污法[13][14]    13
2.3 微生物除污法[14]    13
2.4 熔融除污法[15]    13
2.5 化學泡沫除污法[16]    14
2.6 雷射除污法[17]    14
2.7 電漿除污法[18]    14
3 電化學除污    15
3.1 電化學除污簡介    15
3.2 電化學除污原理    15
3.3 電化學除污溶液    18
3.4 電化學除污相關文獻    20
第三章 研究方法    28
1 實驗流程    28
2 試片準備    30
2.1 試片規格與成分    30
2.2 試片熱處理    30
3 預長氧化膜    31
3.1 高溫氧化層    31
3.2 電鍍氧化層    31
3.3 複合氧化層    32
4 電化學除污槽設置    33
5 氧化層分析以及表面形貌觀察    33
5.1 掃描式電子顯微鏡(SEM)    34
5.2 拉曼散射光譜(Raman)    34
6 重量變化分析    34
7 厚度變化分析    35
第四章 實驗結果與討論    37
1 試片氧化層分析    37
1.1 表面分析    37
1.2 橫截面分析    40
2 電化學除污前後試片巨觀表面形貌變化    41
2.1 基材    41
2.2 高溫氧化層    42
2.3 電鍍氧化層    44
2.4 複合氧化層    45
3 定電流下試片大小及形狀對電化學除污效率之影響    46
3.1 不同面積的平板試片對電化學除污效率之影響    46
3.2 不同面積的管狀試片對電化學除污效率之影響    63
3.3 各形狀與大小試片對電化學除污效率彙整    76
4 相同電流密度下試片大小對電化學除污效率的影響    78
4.1 重量變化    78
4.2 單位面積重量變化    81
4.3 厚度變化    83
第五章 結論    86
參考資料    87

                                

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