Hastelloy N合金和316L不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究

doi:10.11902/1005.4537.2014.275

中国腐蚀与防护学报

2015, Vol. 35

Issue (6): 543-548 DOI: 10.11902/1005.4537.2014.275

研究报告

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Hastelloy N合金和316L不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究

丁祥彬,孙华(

),俞国军,周兴泰

中国科学院上海应用物理研究所上海 201800

Corrosion Behavior of Hastelloy N and 316L Stainless Steel in Molten LiF-NaF-KF

Xiangbin DING,Hua SUN(

),Guojun YU,Xingtai ZHOU

Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

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摘要:

利用静态腐蚀实验并结合SEM和EPMA等分析技术,研究了Hastelloy N合金和316L不锈钢在700 ℃ LiF-NaF-KF (FLiNaK) 熔融盐中的长时间腐蚀行为。结果表明,两种材料在FLiNaK熔盐中均表现为持续腐蚀,其中Hastelloy N合金耐腐蚀性能优于316L不锈钢。Hastelloy N合金表现为微弱的均匀腐蚀,Cr由合金基体均匀向外扩散;316L不锈钢主要以晶间腐蚀为主,Cr沿晶界向外扩散。浸泡时间增加,Hastelloy N合金单位面积失重先增加然后逐渐减小,316L不锈钢单位面积失重先快速增加,然后逐渐趋于平稳。两种材料在氟化物熔盐中腐蚀行为差异主要与合金化学成分不同有关。

关键词 ： Hastelloy, N合金, 316L不锈钢, 氟化物熔盐, 腐蚀

Abstract：

The corrosion behavior of Hastelloy N and 316L stainless steel (316L) in molten eutectic LiF-KF-NaF (FLiNaK) salt at 700 ℃ for 1000 h was investigated by means of static corrosion tests, while the corroded alloys were examined by SEM and EPMA. It was found that Hastelloy N and 316L all suffered from steady corrosion, while the corrosion resistance of Hastelloy N was superior to that of 316L. Hastelloy N experienced slight uniform corrosion, which was mainly due to the outward diffusion of Cr from the alloy. While 316L suffered from significant intergranular corrosion, which was related to the outward diffusion of Cr along grain boundaries. In addition, the mass loss of Hastelloy N firstly increased, and then degraded slowly with exposure time, which was mainly attributed to the re-deposition of Ni and Fe from the molten salt on the surface of Hastelloy N. The mass loss of 316L increased obviously for the first 400 h, and then became stable. The different in corrosion behavior of the two alloys in molten fluoride salt was mainly associated with their difference in chemical composition.

Key words： Hastelloy N 316L stainless steel fluoride molten salt corrosion

基金资助:中国科学院战略性先导科技专项项目 (XDA02040000)资助

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引用本文:

丁祥彬,孙华,俞国军,周兴泰. Hastelloy N合金和316L不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(6): 543-548.
Xiangbin DING, Hua SUN, Guojun YU, Xingtai ZHOU. Corrosion Behavior of Hastelloy N and 316L Stainless Steel in Molten LiF-NaF-KF. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 543-548.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.275 或 https://www.jcscp.org/CN/Y2015/V35/I6/543

表1 Hastelloy N合金和316L不锈钢的化学成分

图1 静态腐蚀实验反应釜结构示意图

图2 Hastelloy N合金和316L不锈钢不同腐蚀时间的单位面积失重

图3 Hastelloy N合金和316L不锈钢在700 ℃ FLiNaK熔盐中腐蚀不同时间的截面形貌

图4 Hastelloy N合金和316L不锈钢腐蚀50和1000 h截面Cr, Ni和Fe的EPMA面扫描分析结果

图5 利用HSC5.1软件计算在700 ℃下单位摩尔F2的常见氟化物Gibbs自由能

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