Fe34Cr30Mo15Ni15Nb3Al3 高熵合金在500℃下氧含量为10-6%的液态铅铋合金中腐蚀行为研究

doi:10.11902/1005.4537.2023.331

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1353-1360 CSTR: 32134.14.1005.4537.2023.331 DOI: 10.11902/1005.4537.2023.331

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Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃ 高熵合金在500℃下氧含量为10^-⁶%的液态铅铋合金中腐蚀行为研究

潘宗宇¹^,², 刘静²(

), 姜志忠²^,³, 罗林²^,³, 贾寒冰²^,³, 刘欣雨²^,³

1 安徽大学物质科学与信息技术研究院合肥 230601
2 中国科学院合肥物质科学研究院核能安全技术研究所合肥 230031
3 中国科学技术大学合肥 230026

Corrosion Behavior of Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃ High-entropy Alloy in Molten Pb-Bi Eutectic Containing 10^-⁶% Oxygen at 500^oC

PAN Zongyu¹^,², LIU Jing²(

), JIANG Zhizhong²^,³, LUO Lin²^,³, JIA Hanbing²^,³, LIU Xinyu²^,³

1 Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
2 Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
3 University of Science and Technology of China, Hefei 230026, China

引用本文:

潘宗宇, 刘静, 姜志忠, 罗林, 贾寒冰, 刘欣雨. Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃ 高熵合金在500℃下氧含量为10^-⁶%的液态铅铋合金中腐蚀行为研究[J]. 中国腐蚀与防护学报, 2024, 44(5): 1353-1360.
Zongyu PAN, Jing LIU, Zhizhong JIANG, Lin LUO, Hanbing JIA, Xinyu LIU. Corrosion Behavior of Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃ High-entropy Alloy in Molten Pb-Bi Eutectic Containing 10^-⁶% Oxygen at 500^oC[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1353-1360.

全文: PDF(9810 KB) HTML

摘要:

制备了Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃高熵合金，铸态组织包含FCC相、Laves相和B2-NiAl相。随后将高熵合金置于500℃、氧浓度为10^-6%(质量分数)的液态铅铋合金中进行1000~2000 h的静态腐蚀实验。结果表明：高熵合金未发生明显的元素溶解、铅铋渗透和相变。静态腐蚀1000~2000 h后，Laves相区域表面只生成了Fe-Cr尖晶石。但腐蚀1000 h后，FCC/B2-NiAl相区域表面除了内层生成了Fe-Cr尖晶石，外层还生成了贫Cr的Fe-Cr尖晶石；随着腐蚀时间增加到1500 h，FCC/B2-NiAl相区域外层贫Cr的Fe-Cr尖晶石发生脱落；腐蚀2000 h后，Fe₃O₄开始生成，覆盖FCC/B2-NiAl相区域外表面。高熵合金表面的氧化层均较薄，厚度不超过3 µm，表现出较好的耐腐蚀性。高熵合金具有良好耐腐蚀的原因是由于Laves相分布均匀，抑制了金属元素的向外扩散。

关键词 ： Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃高熵合金, 液态铅铋合金腐蚀, Laves相, Fe-Cr尖晶石

Abstract：

In this paper, a high-entropy alloy Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃ was prepared via vacuum induction melting technique. The cast alloy consists of FCC phase, Laves phase and B2-NiAl phase. Then, the high-entropy alloy was subjected to corrosion test at 500^oC in static molten Pb-Bi eutectic (MBE) containing 10^-6% oxygen (in mass fraction) for 1000, 1500 and 2000 h, respectively. The results showed that after corrosion test, the high entropy alloy did not show obvious signs of being attacked by molten Pb-Bi eutectic, namely, there was no obvious dissolution of alloy components and phase transformation, and no obvious inward permeation of Pb and Bi from MBE into the alloy. Only a continuous Fe-Cr spinel scale was formed on the Laves phase region after static corrosion from 1000 h to 2000 h. It is worth mentioning in particular that after exposure for 1000 h, both of Fe-Cr spinel and Cr-depleted Fe-Cr spinel was formed on the surface of FCC/B2-NiAl phase region. As the corrosion time increased to 1500 h, the outer scale of Cr-depleted Fe-Cr spinel formed on the FCC/B2-NiAl phase region spalled off. After exposure for 2000 h, Fe₃O₄ was generated above the Fe-Cr spinel scale, and covered the entire surface of FCC/B2-NiAl phase region. In conclusion, the oxide scales formed on the high-entropy alloy are very thin and compact, with a maximum thickness less than 3 µm, so that the high-entropy alloy presented good resistance to MBE corrosion. The outstanding corrosion resistance of high-entropy alloy may be attributed to the homogeneous distribution of Laves phase, which effectively suppresses the outward diffusion of components of the high-entropy alloy.

Key words： Fe₃₄Cr₃₀Mo₁₅Ni₁₅Nb₃Al₃ high-entropy alloy Liquid lead-bismuth eutectic alloy corrosion Laves phase Fe-Cr spinel

收稿日期: 2023-10-23 32134.14.1005.4537.2023.331

ZTFLH:

TG178

基金资助:国家重点研发计划(2022YFB1902502);中国科学院合肥大科学中心重点研发项目(2022HSC-CIP028);中国科学院合肥物质科学研究院院长基金(YZJJ2022QN39)

通讯作者: 刘静，E-mail：jing.liu@inest.cas.cn，研究方向为高温液态铅合金环境腐蚀及防护新材料

Corresponding author: LIU Jing, E-mail: jing.liu@inest.cas.cn

作者简介: 潘宗宇，男，1996年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.331 或 https://www.jcscp.org/CN/Y2024/V44/I5/1353

图1 HEA-15合金腐蚀前的XRD谱

图2 HEA-15合金腐蚀前的微观组织

表1 HEA-15合金中各元素质量分数

图3 不同腐蚀时间后HEA-15合金表面的XRD谱

图4 不同腐蚀时间后HEA-15合金表面的微观形貌

表2 图4的点扫描数据 (atomic fraction / %)

图5 图2a中Laves相和图4a中氧化层凹陷区域宽度和长度对比

图6 HEA-15合金不同腐蚀时间后的截面形貌和EDS面扫描图

图7 HEA-15合金不同腐蚀时间后的线扫描结果

表3 不同腐蚀时间氧化层的厚度

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