从β-Nb 氧化角度探究 Zr-Nb 系锆合金在 LiOH 水溶液中腐蚀加速的机理

doi:10.12066/j.issn.1007-2861.2258

摘要/Abstract

摘要：

E110 和 M5 等 Zr-Nb 系锆合金在堆内和 360 °C/18.6 MPa/去离子水中表现出优良的耐腐蚀性, 但在 360 °C/18.6 MPa/0.01 mol/L LiOH 水溶液中表现出明显的腐蚀加速现象. 综述了 Zr-Nb 系锆合金中的主要第二相 β-Nb 在不同腐蚀条件下的腐蚀氧化行为, 发现 β-Nb 第二相在 LiOH 水溶液中腐蚀时很快氧化成 Nb₂O₅, Nb₂O₅ 会与 LiOH 反应形成 LiNbO₃, LiNbO₃ 会溶解进入溶液而在氧化膜中留下孔隙. 从β-Nb 第二相氧化角度阐述了 Zr-Nb 系锆合金在 LiOH 水溶液中发生腐蚀加速的机理.

关键词: 锆合金, β-Nb, 腐蚀

Abstract:

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

中图分类号:

TL341
TG171

姚美意, 周邦新. 从β-Nb 氧化角度探究 Zr-Nb 系锆合金在 LiOH 水溶液中腐蚀加速的机理[J]. 上海大学学报(自然科学版), 2020, 26(5): 681-692.

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（Natural Science Edition）, 2020, 26(5): 681-692.

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