Corrosion-related defects in Zircaloys: a preliminary study with slow positron beam

13th International Workshop on Slow Positron Beam Techniques and Applications

Zhu, Z.J.^1 ; Yao, M.Y.^2 ; Xue, X.D.^1 ; Wu, Y.C.^1 ; Zhou, B.X.^2

School of Physics and Technology, Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China^1

Institute of Materials, Shanghai University, Shanghai 200072, China^2

关键词: LiOH aqueous solution;    N18 alloy;    Oxide layer;    Positron energy;    Slow positron beam;    Superheated steam;    Variable-energy positron annihilation spectroscopies;    Zircaloy-4;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012008/pdf
DOI  :  10.1088/1742-6596/505/1/012008

来源: IOP

【 摘 要 】

Corrosion-related microstructure and defects in Zircaloy-4 and N18 alloys were investigated by variable energy positron annihilation spectroscopy. The specimens were corroded in 0.01mol/L LiOH aqueous solution at 360 °C/18.6 MPa and in super heated steam at 400 °C/10.3 MPa, respectively. Defect profiles were analyzed by measuring the S parameter as a function of incident positron energy from 0.25 to 27 keV. Results indicated that Zircaloys corroded in LiOH aqueous solution contained more defects in the oxide layer than that in superheated steam, which implies that formation of defects in oxide layer may relate to the effects of Li+ions in corrosion solution.