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为了改进锆合金的耐腐蚀性能,提出了基于氧化膜自由能理论的设计理念,对其腐蚀规律进行系统研究.设计了7种新锆合金成分方案,并针对不同成分系统设计了具有代表性的加工工艺,最后通过高压釜试验验证设计理念,获得耐腐蚀性能优良的2种新锆合金.将试样在360℃/18.6 MPa的纯水和含锂水中腐蚀200d后对比分析其腐蚀性能.结果表明:添加Cu和Si的2种锆合金的耐腐蚀性能明显优于其他锆合金;对于含质量分数0.8%~1.2%Nb的锆合金,使用传统的低温退火工艺,有利于提高耐腐蚀性能;对于含质量分数0.2%~0.5%Nb的锆合金,使用β水淬来替代常规中间退火的工艺,可明显改善合金的耐腐蚀性能.
In order to improve the corrosion resistance of zirconium alloy, a design concept based on free energy theory of oxide film was proposed and the corrosion rules of the zirconium alloy were systematically studied. Seven kinds of new zirconium alloy compositions were designed and designed for different compositional systems Finally, the autoclave test was used to verify the design concept and two new zirconium alloys with excellent corrosion resistance were obtained.The corrosion behavior of the samples was analyzed after being corroded for 200 days in pure water and lithium-containing water at 360 ℃ / 18.6 MPa.Results The results show that the corrosion resistance of two kinds of zirconium alloys with addition of Cu and Si is obviously better than that of other zirconium alloys. For the zirconium alloys containing 0.8% -1.2% Nb, the traditional low temperature annealing process is beneficial to improve the corrosion resistance. For the zirconium alloy with mass fraction of 0.2% ~ 0.5% Nb, the use of β water quenching instead of the conventional intermediate annealing process can obviously improve the corrosion resistance of the alloy.