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The Distribution of Li Ions in the Oxide Film Formed on Zircaloy-4 Corroded in Lithiated Water at 633 K

Sciprofile linkShijing Xie, Sciprofile linkBangxin Zhou, Sciprofile linkXue Liang, Sciprofile linkQiang Li, Sciprofile linkWenqing Liu, Sciprofile linkMeiyi Yao, Sciprofile linkJinlong Zhang
Published: 15 February 2020
 by  MDPI
Materials , Volume 13; doi:10.3390/ma13040873

Abstract: Transmission electron microscopy (TEM), second ion mass spectrum (SIMS) and atom probe tomography (APT) techniques are used to study the Li ion distribution in the oxide formed on the rolling surface (SN) of Zircaloy-4 corroded in lithiated water with 0.01 M LiOH at 633 K/18.6 MPa. The results showed that the Li ions segregated in the grain boundaries and subgrain boundaries in the oxide film, but nearly no Li ions were found in the oxide around the interface between the oxide and matrix. Finally, we discussed the mechanism of the LiOH influence on the corrosion resistance of Zircaloy-4.
Keywords: corrosion resistance / Zircaloy-4 / Atom probe tomography / Li ion segregation / oxide grain boundary

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