FLiNaK-CrF<sub>3</sub>/CrF<sub>2</sub>氧化还原缓冲熔盐体系对316L不锈钢耐蚀性能的影响

doi:10.11902/1005.4537.2019.019

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 182-190 DOI: 10.11902/1005.4537.2019.019

研究报告

本期目录 | 过刊浏览

FLiNaK-CrF₃/CrF₂氧化还原缓冲熔盐体系对316L不锈钢耐蚀性能的影响

秦越强¹^,², 左勇¹^,²^,³(

), 申淼¹^,³

1 中国科学院上海应用物理研究所上海 201800
2 中国科学院大学北京 100049
3 中国科学院洁净能源创新研究院大连 116023

Corrosion Inhibition of 316L Stainless Steel in FLiNaK-CrF₃/CrF₂ Redox Buffering Molten Salt System

QIN Yueqiang¹^,², ZUO Yong¹^,²^,³(

), SHEN Miao¹^,³

1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, China

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摘要:

研究了316L不锈钢在FLiNaK-CrF₃/CrF₂氧化还原体系中的腐蚀行为，通过改变LiF-NaF-KF(FLiNaK) 熔盐中[Cr³⁺]/[Cr²⁺]的浓度比值来调节熔盐电位，并用一种修正的Tafel方法测得316L不锈钢在不同电位下的氧化还原缓冲熔盐中的腐蚀电流密度。结果表明，实验温度为873和823 K时，使熔盐电位分别低于-0.741和-0.703 V，能有效抑制316L不锈钢在FLiNaK熔盐中的腐蚀。并通过传统的浸泡方法验证了这一结论。氧化还原缓冲熔盐还有另一重要特性，不同的金属或合金材料在熔盐中有着几乎一致的电位，这是使用修正的Tafel方法测得316L不锈钢在缓冲熔盐中的腐蚀电流密度的重要前提。

关键词 ：氧化还原缓冲熔盐, 熔盐电位, 腐蚀电流密度, 腐蚀抑制, 316L不锈钢

Abstract：

The corrosion behavior of 316L stainless steel (316LSS) in FLiNaK-CrF₃/CrF₂ redox system has been studied in this paper. The corrosion rate of 316LSS in molten salt was found to be dependent on the salt potential, which can be adjusted by varying the ratio of the ion pairs ([Cr³⁺]/[Cr²⁺]) in the molten salt. When the salt potential was controlled below -0.741 V vs Ni/NiF₂ at 873 K or -0.703 V vs Ni/NiF₂ at 823 K, the corrosion of 316LSS in the molten salt can be effectively inhibited. This conclusion was verified by the immersion corrosion tests. Another important and interesting feature of the redox buffering molten salt is that different metal- or alloy-materials have almost identical potential in the salt. This effect is significant for applying the modified Tafel method in the redox buffering system.

Key words： redox buffering molten salt molten salt potential corrosion current density corrosion inhibition 316L stainless steel

收稿日期: 2019-01-23

ZTFLH:

O646.6

基金资助:中国科学院战略先导专项(XDA02020400);中国科学院战略先导专项(XDA21000000)

通讯作者: 左勇 E-mail: zuoyong@sinap.ac.cn

Corresponding author: ZUO Yong E-mail: zuoyong@sinap.ac.cn

作者简介: 秦越强，男，1992年生，硕士生

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引用本文:

秦越强, 左勇, 申淼. FLiNaK-CrF₃/CrF₂氧化还原缓冲熔盐体系对316L不锈钢耐蚀性能的影响[J]. 中国腐蚀与防护学报, 2020, 40(2): 182-190.
Yueqiang QIN, Yong ZUO, Miao SHEN. Corrosion Inhibition of 316L Stainless Steel in FLiNaK-CrF₃/CrF₂ Redox Buffering Molten Salt System. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 182-190.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.019 或 https://www.jcscp.org/CN/Y2020/V40/I2/182

图1 实验装置简图

图2 具有离子导通功能的热压氮化硼管参比电极

图3 经典Tafel方法在非氧化还原缓冲体系中应用原理图

图4 修正的Tafel方法在氧化还原缓冲体系中应用原理图

图5 316L不锈钢和Ag电极在氧化还原缓冲体系 (FLiNaK-CrF3/CrF2) 中的阴极极化曲线

图6 Ag在873 K下纯FliNaK熔盐中的循环伏安曲线 (扫描速率100 mV/s)

图7 Ag在873 K下FLiNaK-CrF3/CrF2体系中的循环伏安曲线 (扫描速率100 mV/s)

图8 316L不锈钢在873 K下FLiNaK-CrF3/CrF2体系中的循环伏安曲线 (扫描速率: 100 mV/s)

表1 通过循环伏安法获得Cr3+/Cr2+的峰电势EP，并计算出半波电势E1/2

图9 在873 K时随着CrF2逐步添加到含有1000 μg·g-1 CrF3的FLiNaK熔盐中，Ag和316L不锈钢上开路电位的变化

图10 纯Fe丝、316L不锈钢和Hastelloy C-276 (HC276) 在873 K下含有500 μg·g-1 CrF3的FLiNaK中的阳极极化曲线

图11 Ag丝、纯Fe丝、316L不锈钢和Hastelloy C-276 (HC276) 在873 K下FLiNaK-CrF3/CrF2熔盐体系中的阳极极化曲线

图12 添加了1000 μg·g-1 CrF3的FLiNaK盐及添加了1000 μg·g-1 CrF3和800 μg·g-1 CrF2的FLiNaK盐冷却后的实物图

图13 316L不锈钢在873和823 K下纯FLiNaK熔盐中的阳极极化曲线

图14 316L不锈钢在873和823 K、不同熔盐电位条件下的腐蚀电流密度

图15 在熔盐中浸泡100 h后的316L不锈钢丝截面SEM像

图16 在不同的温度和电位下316L不锈钢和Ag电极在FLiNaK-CrF3/CrF2氧化还原缓冲体系中的阳极极化曲线

图17 用修正的Tafel方法处理后获得的316L不锈钢和Ag电极在FLiNaK-CrF3/CrF2氧化还原缓冲体系中的阳极极化曲线

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