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題名 | 海水電解設備陰極材料之侵蝕研究 |
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作者 | 李日輝; | 書刊名 | 台電工程月刊 |
卷期 | 548 1994.04[民83.04] |
頁次 | 頁56-64 |
分類號 | 448.13 |
關鍵詞 | 鎳基合金; 海水電解; 短路放電; 渦凹侵蝕; 氫脆; 無縫鈦管; Nickel-based alloy; Sea water electrolysis; Electric arcing; Cavitation errosion; Hydrogen Embrittlement; Weldless titanium tube; |
語文 | 中文(Chinese) |
中文摘要 | 鈦管及鎳基C-276合金使用於電廠海水電解設備之陰極材料,經長期使 用發現有破損情形。本研究主要以金相及電子顯微鏡觀察探討電極之損壞原因, 俾提供電廠維修之依據。實驗室並進行短路放電模擬試驗,以確切了解鎳基材料 是否因短路而導致破損;此外亦對鎳基陰極材料進行陰極電位試驗,以了解其是 否有氫脆現象,相關之技術包括高溫萃取定氫法分析氫含量、X光繞射分析、化 學能譜分析等。重要之結果如下:1.鎳基陰極板之穿孔,是因短路造成電弧放電所 致。2.鎳基陰極板表面之侵蝕現象,可能是因電極長期受到初生態氫對鎳、鉻 及鉬之氧化物產生還原性溶解之化學作用,及氫氣泡對電極產生之機械侵蝕作 用。3.鎳基陰極材料在不施加外力之情況下充氫688小時至氫含量30.27cc/100g仍 不曾發生相變化,晶格之變化在0.2以內,金相亦末發現氫氣造成之裂縫或起泡 等現象,顯示此陰極不易受氫氣影響。4.鈦基陰極管之破裂乃是由於在銲道及熱 影響區形成氫化鈦導致膨脹應力所引發之脆性破裂,裂縫之源起及生長均在熱影 響區內。 |
英文摘要 | Titanium tube and nickel-based alloy was used as the cathode inthe facility of sea water eletrolysis in power plant, some corrosivephenomena were found after long-term operation. An arching test ofnickel-based alloy was conducted in the laboratory to simulate thefield phenomena. A test of nickel - based alloy under constant cathodicpotential was also used to study the effect of the release of hydrogen. Thesamples of field and laboratory were investigated by the followingtechniques: SEM, XRD, and ESCA. Some conclusions can be drawn asfollowing:1. The perforation of the electrode is most probably caused by an arcing between the cathode and its neighboring anode.2. The etching phenomena of the electrode can be explained by the chemical effect of hydrogen reduction, and the mechanical effect of forming hydrogen bubbles on the electrode.3. When Hastealloy C - 276 under cathodic charging condition, no hydrogen embrittlement or phase transfer was observed. The change of crystal lattice was less than 0.2.4. The formation of titanium hydride in welded metal and heat affacting zone is responsible for the brittle rupture of titanium tube, and the crack initiation and propagation is found occuring in this area. |
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