Zr-Sn-Nb-Fe-Mo合金在高温高压水中的腐蚀行为
Corrosion Behaviors of Zr-Sn-Nb-Fe-Mo Alloy in High Temperature and High Pressure Water
摘 要
采用高压釜腐蚀试验研究了Zr-Sn-Nb-Fe-Mo合金在360 ℃/18.6 MPa去离子水中的耐蚀性，采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和激光拉曼光谱分析了合金腐蚀前后的显微组织。结果表明：合金在腐蚀300 d的腐蚀增重相比ZIRLO合金的降低了30%以上。合金中生成了均匀弥散的HCP结构的Zr（Nb，Fe）2和Zr（Nb，Fe，Mo）2第二相颗粒。腐蚀260 d后氧化膜中出现明显的平行于氧化膜/基体界面的裂纹，四方相t-ZrO2含量显著减少是氧化膜中产生裂纹并加速合金腐蚀的重要因素。添加Mo元素生成的Zr（Nb，Fe，Mo）2第二相颗粒起到了延迟氧化并减小氧化膜内应力的作用。
腐蚀性能
第二相颗粒
氧化膜
zirconium alloy
corrosion resistance
second phase particle
oxide film
Abstract
The corrosion resistance of Zr-Sn-Nb-Fe-Mo alloy in 360 ℃/18.6 MPa deionized water was studied by autoclave corrosion test. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and laser Raman spectroscopy were used to analyze the microstructure of the alloy before and after corrosion. The results showed that the corrosion weight gain of the alloy after 300 days of corrosion reduced by more than 30% compared to ZIRLO alloy. Zr(Nb,Fe)2 and Zr(Nb,Fe,Mo)2 second phase particles with HCP structure generated in the alloy were dispersed uniformly. After 260 days of corrosion, there were obvious cracks in the oxide film parallel to the oxide film/substrate interface. The significant reduction of t-ZrO2 in the tetragonal phase was an important factor that caused cracks in the oxide film and accelerated alloy corrosion. The Zr(Nb,Fe,Mo)2 second-phase particles generated by adding Mo element played a role in delaying oxidation and reducing the internal stress in the oxide film.
中图分类号 TG174 DOI 10.11973/fsyfh-202009006
所属栏目 核电设备的腐蚀与防护
基金项目 大型先进压水堆核电站重大专项（2019ZX06002001）
收稿日期 2020/4/30
修改稿日期
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引用该论文: LU Junqiang,CHEN Fuliang,ZENG Qifeng,SHI Huigang,GUO Xianglong. Corrosion Behaviors of Zr-Sn-Nb-Fe-Mo Alloy in High Temperature and High Pressure Water[J]. Corrosion & Protection, 2020, 41(9): 32
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【7】PÊCHEUR D. Oxidation of β-Nb and Zr(Fe,V)2 precipitates in oxide films formed on advanced Zr-based alloys[J]. Journal of Nuclear Materials,2000,278(2/3):195-201.
【8】KIM H G,PARK J Y,JEONG Y H. Ex-reactor corrosion and oxide characteristics of Zr-Nb-Fe alloys with the Nb/Fe ratio[J]. Journal of Nuclear Materials,2005,345(1):1-10.
【9】PARK J Y,CHOI B K,JEONG Y H,et al. Corrosion behavior of Zr alloys with a high Nb content[J]. Journal of Nuclear Materials,2005,340(2/3):237-246.
【10】周邦新,李强,姚美意,等. Zr-4合金氧化膜的显微组织研究[J]. 腐蚀与防护,2009,30(9):589-594,610.
【11】TOFFOLON-MASCLET C,BRACHET J C,JAGO G. Studies of second phase particles in different zirconium alloys using extractive carbon replica and an electrolytic anodic dissolution procedure[J]. Journal of Nuclear Materials,2002,305(2/3):224-231.
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