Effect of Annealing Temperatures on Corrosion Resistance of a Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr Alloy
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摘要: 为了研究退火温度对Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr合金耐腐蚀性能的影响,在740-820℃温度范围内改变冷轧前后的退火温度制备样品,通过静态高压釜腐蚀实验研究样品在360℃/18.6 MPa去离子水、400℃/10.3 MPa过热蒸汽和500℃/10.3 MPa过热蒸汽中的腐蚀行为;用透射电镜(TEM)和能谱仪(EDS)研究合金的显微组织,包括第二相的尺寸、成分与种类。研究结果表明,这种锆合金中的第二相为含少量Nb的密排六方结构的Zr(Fe,Cr,Nb)2,提高退火温度使第二相尺寸增大,第二相中的Nb含量降低;在740-800℃温度范围内改变退火温度,样品在上述中性水质中的耐腐蚀性能与常规工艺处理的相当,且都优于Zr-4合金,表明该合金的耐腐蚀性能对退火温度并不敏感。Abstract: To investigate the effect of annealing temperatures on the corrosion resistance of a Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr alloy,different annealing temperatures（740-820℃） before and after the final cold rolling were employed to prepare the specimens for corrosion tests.The specimens were corroded in deionized water at 360℃/18.6 MPa,in super heated steam at 400℃/10.3 MPa and at 500℃/10.3 MPa,respectively by autoclave test.The microstructure including the size and composition of second phase particles（SPPs） was examined by TEM and EDS.Results show that the SPPs in the Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr alloy are Zr（Fe,Cr,Nb）2 with a hcp structure;With the increasing of annealing temperatures,the size of the SPPs increases and the Nb content in the SPPs decreases;Under the three test conditions,the specimens annealed at different temperatures between 740℃ and 800℃ are all with corrosion resistance behavior as good as the specimen prepared by conventional procedures,and their corrosion resistance is superior to Zircaloy-4.This indicates that the corrosion resistance of this alloy is insensitive to the annealing temperatures.
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Key words:
- Zirconium alloys /
- Corrosion resistance /
- Annealing temperature /
- Microstructure
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