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Mechanism of the accelerated corrosion of Zr-Nb alloys in lithiated water from the viewpoint of β-Nb oxidation
Received date: 2020-08-07
Online published: 2020-10-16
Zr-Nb series zirconium alloys such as E110 and M5 show excellent corrosion resistance in nuclear reactors and static autoclaves with deionised water at 360 °C and 18.6 MPa. However, the alloys exhibit accelerated corrosion in lithiated water with 0.01 mol/L LiOH under identical conditions of temperature and pressure. The oxidation behaviour of β-Nb, which is the main second phase particle in Zr-Nb series zirconium alloys, is overviewed under different corrosive conditions in this study. It is found that β-Nb is quickly oxidised to Nb2O5 , which may react with LiOH to form LiNbO3; it also dissolves into the corrosive environment to leave pores in the oxide films. The mechanism of accele-rated corrosion of Zr-Nb series zirconium alloys in lithiated water with LiOH is proposed from the viewpoint of β-Nb oxidation.
Key words： zirconium alloy; β-Nb; corrosion
YAO Meiyi, ZHOU Bangxin . Mechanism of the accelerated corrosion of Zr-Nb alloys in lithiated water from the viewpoint of β-Nb oxidation[J]. Journal of Shanghai University, 2020 , 26(5) : 681 -692 . DOI: 10.12066/j.issn.1007-2861.2258
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