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題名 | 應用氧化鋯化學添加進行沸水式反應器組件之防蝕研究=Corrosion Mitigation for Structural Component in Boiling Water Reactor via Zirconium Oxide Chemical Addition |
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作者 | 葉宗洸; 王秋蘋; 劉展東; 鄭秋敏; 沈榮福; 朱方; | 書刊名 | 台電工程月刊 |
卷期 | 689 民95.01 |
頁次 | 頁88-100 |
分類號 | 449.2 |
關鍵詞 | 沸水式反應器; 催化性; 抑制性被覆; 熱水沉積法; 應力腐蝕龜裂; Boiling water reactor; BWR; Catalytic; Inhibitive protective coating; IPC; Hydrothermal deposition; Intergranular stress corrosion cracking; IGSCC; |
語文 | 中文(Chinese) |
中文摘要 | 在過去數年的研究中,我們發現抑制性被覆(Inhibitive Protective Coating, IPC)確實可延緩沸水式反應器(Boiling Water Reactor, BWR)組件材料上沿晶應力腐蝕龜裂(Intergranular Stress Corrosion Cracking, IGSCC)的起始並改善其機械性質。為了進一步量化IPC技術對於組件防蝕的成效以及探究IPC的工作原理,本研究採用熱水沉積氧化鋯(ZrO₂)做為被覆實施的方式與材料,在模擬BWR的環境中針對304不銹鋼進行動態電位極化掃描分析,探討其於被覆處理前後的電化學與腐蝕行為。 研究結果顯示,透過熱水沉積法完成氧化鋯被覆處理的試片表面,藉由掃描式電子顯微鏡確可於其氧化膜上的局部位置觀察到結構與色澤明顯不同的非晶質狀覆膜,透過能量散佈X光表面分析可以發現該覆膜有大量的鋯成分存在。依據動態電位極化掃描分析結果,IPC處理對於氧的還原反應以及氫與金屬的氧化反應同樣有抑制的效果,不過其對於氧之還原反應的抑制效果遠高於對氫與金屬之氧化反應的抑制,此結果驗證了IPC的具體防蝕效益。 |
英文摘要 | For the past few years, we have experimentally confirmed the benefit of inhibitive protective coating (IPC) on prolonging the initiation of intergranular stress corrosion cracking (IGSCC) and improving the mechanical properties of structural materials used in boiling water reactors (BWRs). In order to further quantify the effectiveness of the IPC technique on corrosion mitigation and explore the corrosion mitigation mechanism of IPC, samples prepared by pre-oxidized Type 304 stainless steels and by the ones additionally treated with zirconium oxide (ZrO₂) via hydrothermal deposition were both undergone by electrochemical polarization analyses in simulated boiling water reactor environments. The electrochemical and corrosion behavior of these samples were analyzed. During the surface examination before the electrochemical analyses, discontinuous and amorphous ZrO₂ coatings on the surfaces of the treated samples were observed via scanning electron microscope. In addition, the presence of a significant amount of ZrO₂ was further confirmed by energy dispersive X-ray microscopy. According to the polarization analysis results, the IPC treatment seemed to simulatneously deter the reaction rates of oxygen reduction, hydrogen oxidation, and metal oxidation. However, the inhibitive effect of the IPC treatment on oxygen reduction was found greater than that on both hydrogen and metal oxidation, and the outcome manifested the corrosion mitigation effectiveness of the IPC technique. |
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