第58卷第1期2024年1月原子能科学技术AtomicEnergyScienceandTechnologyVol.58,No.1Jan.2024锆合金氧化膜及基体中氧的扩散张君松，吴军，廖京京，韦天国，龙冲生*（中国核动力研究设计院反应堆燃料及材料重点实验室，四川成都610041）摘要：锆合金氧化膜及基体中氧的扩散系数是锆合金腐蚀动力学中的重要参数，目前文献报道的氧在锆及氧化膜中的扩散系数数值差异较大。本文通过真空退火试验，得到不同温度下氧化膜中氧浓度分布，计算了氧在锆合金基体中的扩散系数；通过氧化膜的等效扩散模型，由腐蚀转折前的腐蚀增重曲线，估算锆合金氧化膜中氧的扩散系数，得到Zr-Sn-Nb合金基体中氧的扩散系数随温度的变化规律为Dzr（cm²/s）=0.18exp（一180000/RT）；通过转折前的腐蚀增重曲线，估算得到氧化膜中氧的扩散系数随温度的变化规律为D（cm²/s)=3×10-7exp（—101550/RT)。关键词：锆合金；锆基体；氧化膜；扩散系数中图分类号：TL304doi:10.7538/yzk.2023.youxian.0116OxygenDiffusioninOxideFilmandMatrixofZirconiumAlloysZHANGJunsong,WUJun,LIAOJingjing,WEITianguo,LONGChongsheng*(ScienceandTechnologyonReactorFuelandMaterialsLaboratory,NuclearPozwerInstituteofChina,Chengdu610041,China)Abstract:Thediffusioncoefficientofoxygeninzirconiumalloyoxidefilmandmatrixisanimportantparameterincorrosionkineticsofzirconiumalloys.Atpresent,therearesomereportsonthediffusioncoefficientofoxygeninzirconiumandoxidefilm,butthenumericalvaluesintheliteraturearequitedifferent.Inthispaper,zirconiumalloywascorrodedinpurewatertoobtainasamplewithanoxidefilmthicknessof1μm.Throughvacuumannealingtest,theoxygenconcentrationdistributionoftheoxidefilmatfourdifferenttemperatureswasobtained,thediffusioncoefficientofoxygeninzirco-niumalloymatrixwascalculated,andtheArrheniusrelationofthediffusioncoefficientinthistemperaturerangewasobtainedbyfitting.Comparedwiththeliteraturedata,thetrendissimilar,butthevaluesaredifferent.Themainreasonsmaybethefollowingtwoaspects:Oneisthemeasurementdeviationofoxygenconcentrationdistributioncurve,includingspatialpositiondeviationandconcentrationerror,andtheotheristhedifferentgrainsizeofsamples.Thediffusioncoefficientofoxygeninzirconiummetalwithout...
