Sn含量对N36锆合金在LiOH水溶液中耐腐蚀性能的影响

中国腐蚀与防护学报

2013, Vol. 33

Issue (2): 117-122

研究报告

本期目录 | 过刊浏览

Sn含量对N36锆合金在LiOH水溶液中耐腐蚀性能的影响

杨忠波赵文金苗志

中国核动力研究设计院反应堆燃料及材料重点实验室成都 610041

Effect of Sn Content on Corrosion Resistance of N36 Alloys in LiOH Aqueous Solution

YANG Zhongbo, ZHAO Wenjin, MIAO Zhi

Science and Technology on Reactor Fuel and Materials Laboratory，Nuclear Power Institute of China (NPIC) ，Chengdu 610041, China

全文: PDF(4218 KB)

摘要: 比较了N36(Zr-1Sn-1Nb-0.3Fe)及低锡N36 (Zr-0.8Sn-1Nb-0.3Fe)锆合金样品在360 ℃/18.6 MPa/0.03 mol/L LiOH 水溶液中的耐腐蚀性能，发现N36提前发生腐蚀转折，转折后腐蚀增重远高于低锡N36。观察了腐蚀转折后合金样品氧化膜形貌及物相特征，发现在氧化膜断面上形成平行于氧化膜／金属界面的裂纹，而界面氧化膜呈"菜花"状生长；与N36相比，低锡N36氧化膜形貌显示断面裂纹相对较少，界面生长的氧化膜较为平整；随腐蚀速率的增加，断面裂纹增多，界面膜呈"菜花"状凸起越严重；氧化膜中产生的裂纹与四方相的转变有关。讨论了Sn对N36合金耐腐蚀性能影响的机理，认为固溶在α-Zr中的Sn含量是引起耐腐蚀性能差别的主要原因。

关键词 ：锆合金, 耐蚀性, 氧化膜

Abstract：Abstract：The corrosion resistance of N36(Zr-1Sn-1Nb-0.3Fe) and low-tin N36(Zr-0.8Sn-1Nb- 0.3Fe) alloys were studied in 0.03 mol/L LiOH equous solution at 360 ℃ as well as 18.6 mol/L Pa pressure. The results show that the corrosion transition of N36 specimens appears earlier than that of low-tin N36 and the weight gain of N36 specimens is higher than that of low-tin N36 after the corrosion transition. The cracks paralleling to the interface of oxide/metal are formed in the fracture surface of the oxide film and the oxide film in the inner surface appears at the“Cauliflower-like” morphology . With the increasing of corrosion rate ，there are more cracks in the fracture surface of the oxide film and the size of “cauliflower-like”structure grows bigger. It was concluded that the crackss were related to the t-ZrO₂and the solid solution contents of Sn in α-Zr will be responsible for the difference of corrosion resistance for N36 and low-tin N36．

Key words： Key words：zirconium alloys corrosion resistance oxide films

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引用本文:

杨忠波赵文金苗志. Sn含量对N36锆合金在LiOH水溶液中耐腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2013, 33(2): 117-122.
. Effect of Sn Content on Corrosion Resistance of N36 Alloys in LiOH Aqueous Solution. Journal of Chinese Society for Corrosion and protection, 2013, 33(2): 117-122.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2013/V33/I2/117

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