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題 名 | 高溫純水中之參考電極測試與電化學雜訊應力腐蝕監測=A Test Reference Electrodes and SCC Monitoring by Electrochemical Noise in High Temperature Pure Water |
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作 者 | 陳耀明; 馮克林; 朱方; 黃佳伸; | 書刊名 | 台電工程月刊 |
卷 期 | 614 1999.10[民88.10] |
頁 次 | 頁52-60 |
分類號 | 449.1 |
關鍵詞 | 加氫水化學; 參考電極; 電化學雜訊; Hydrogen water chemistry; Reference electrode; Electrochemical noise; |
語 文 | 中文(Chinese) |
中文摘要 | 加氫水化學技術(HWC)為當前BWR核能電廠抑制或緩和再循環水等系統之不 �袗�管路與RPV內部重要結構組件應力腐蝕破裂(SCC)的重要方法。目前世界上各BWR 主要是以材料之腐蝕電位(ECP)及SCC監測來評估電廠HWC執行之效果。因高溫參考 電極與SCC監測技術是測量ECP與監測SCC的必要工具;因此本研究工作為於純水中進 行高溫參考電極尤其是極低濃度KC1外載式Ag/AgC1參考電極之測式,以及選用電化學雜 訊技術進行304型不繡鋼SCC之監測。 研究結果顯示,極低KC1濃度之外載式Ag/AgC1高溫參考電極測試結果顯示,此種電 極應可適用正常水化學(NWC)與加氫水化學(HWC)水質。現場測量ECP時,極低濃 度KC1外載式Ag/AgC1電極可與0.001N KC1外載式Ag/AgC1電極、內載式Ag/AgC1電 極、Pt電極配合使用,將可得到更可靠之測量品質。在電化學雜訊應力腐蝕測試方面,研 究結果顯示緊貼式配對電極與參考電極較能以頻譜分析法反應出應力腐蝕電化學雜訊變化, 然而目前測試結果明確度及一致性仍嫌薄弱,所以無法單獨做為判斷應力腐蝕破裂的指標, 有待更進一步實驗來改善及查證。 |
英文摘要 | Hydrogen water chemistry (HWC) is one of the most important methods in Boiling Water Reactor (BWR) system to mitigate and prevent stress corrosion cracking (SCC) problems of stainless steel components in reactor pressure vessel and recirculation piping system. Currently, the effectiveness of HWC on each BWR is mainly evaluated by the in-situ measurement of electrochemical potentials (ECP) and on-line monitoring of SCC behaviors stainless steels. The high Temperature reference electrodes are the necessary tools for ECP measurement, and SCC monitoring technique is very important to monitor the development of crack. In this study, some high temperature reference electrode especially the external Ag/AgC1 reference electrode of highly dilute KC1 electrolyte are tested in high temperature pure water. Electrochemical Noise technique is used as the tool for monitoring SCC crack development. The experimental work on electrochemical potential measurements reveals that high temperature external Ag/AgC1 reference electrode of highly dilute KC1 electrolyte can adequately function in both NWC and HWC environments. The high dilution external Ag/AgC1 electrode can work in conjunction with external Ag/AgC1 of 0.01N KC1, internal Ag/AgC1 reference electrode, and Pt electrode to ensure the ECP measurement reliability. Electrochemical noise experiment on SCC detection indicates that spectral analysis of the ECN (Electrochemical Noise) results generated by WOL (Wedge Opening Load) specimen with closely attached reference electrode and counter electrodes can more sensitively reflect the progress of crack growth . However, the spectral analytical results can not yet be used as the CSS indicator. Further work remains to be performed to verify the capability and reproducibility of ECN data. |
本系統中英文摘要資訊取自各篇刊載內容。