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300d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260d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。
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.
作者
卢俊强
陈芙梁
曾奇锋
石慧岗
郭相龙
LU Junqiang;CHEN Fuliang;ZENG Qifeng;SHI Huigang;GUO Xianglong(Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd.,Shanghai 200233,China;Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《腐蚀与防护》
CAS
北大核心
2020年第9期32-38,共7页
Corrosion & Protection
基金
大型先进压水堆核电站重大专项(2019ZX06002001)。
关键词
锆合金
腐蚀性能
第二相颗粒
氧化膜
zirconium alloy
corrosion resistance
second phase particle
oxide film
