NiCrMoNb和NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2 中的腐蚀行为研究

doi:10.11902/1005.4537.2025.176

中国腐蚀与防护学报

2026, Vol. 46

Issue (3): 730-742 CSTR: 32134.14.1005.4537.2025.176 DOI: 10.11902/1005.4537.2025.176

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NiCrMoNb和NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl₂ 中的腐蚀行为研究

卢华轶, 李若愚, 程宇飞, 白英雄, 王艳丽(

)

广西大学化学化工学院广西石化资源加工及过程强化技术重点实验室南宁 530004

Corrosion Behavior of NiCrMoNb and NiCoFeCrMoNb Alloys in Molten NaCl-KCl-MgCl₂ at 700 ℃

LU Huayi, LI Ruoyu, CHENG Yufei, BAI Yingxiong, WANG Yanli(

)

Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

引用本文:

卢华轶, 李若愚, 程宇飞, 白英雄, 王艳丽. NiCrMoNb和NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl₂ 中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2026, 46(3): 730-742.
Huayi LU, Ruoyu LI, Yufei CHENG, Yingxiong BAI, Yanli WANG. Corrosion Behavior of NiCrMoNb and NiCoFeCrMoNb Alloys in Molten NaCl-KCl-MgCl₂ at 700 ℃[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 730-742.

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摘要:

通过真空电弧熔炼法制备了NiCrMoNb和NiCoFeCrMoNb合金，并对比探究了两种合金在氩气保护氛围环境下700 ℃熔融氯化盐(24.5NaCl-20.55KCl-54.95MgCl₂ (质量分数，%))中的腐蚀行为及腐蚀机制。研究表明，两种合金均表现出明显的失重现象。在腐蚀初期，由于环境中较高的氧压，两种合金表面均形成不连续的氧化物(MgNiO₂、MgCr₂O₄、MgNb₂O₆和Mg₄Nb₂O₉)；在腐蚀中期，形成连续且较厚的MgO层，这在一定程度上减缓了合金的腐蚀；在腐蚀后期，氯化反应使合金发生明显的活性溶解，导致合金发生明显失重。同时，在NiCrMoNb合金中引入Co和Fe后，合金存在明显的富Nb/Mo相与富Fe/Co/Ni/Cr相，进一步引发电偶腐蚀。在200 h的腐蚀过程中，NiCrMoNb合金的腐蚀过程逐渐由腐蚀离子在氧化膜中的扩散速率控制转变为腐蚀离子在熔盐中的扩散控制，而NiCoFeCrMoNb合金的腐蚀行为相对稳定，腐蚀速率始终只受荷电粒子在氧化膜中的扩散速率所控制。

关键词 ： NiCrMoNb合金, NiCoFeCrMoNb合金, 熔融NaCl-KCl-MgCl₂, 熔盐腐蚀, 腐蚀电化学

Abstract：

In this study, ingots of NiCrMoNb and NiCoFeCrMoNb alloys were melted and cast using vacuum arc melting method. Then the corrosion behavior and mechanism of these two alloys in molten chloride salts (24.5NaCl-20.55KCl-54.95MgCl₂ (in mass fraction)) in an argon atmosphere at 700 ℃ were comparatively investigated. Results show that the two alloys suffered from significant mass loss in the molten salts. Due to the high oxygen partial pressure in the environment in the initial corrosion stage, scales of discontinuous oxides (including MgNiO₂, MgCr₂O₄, MgNb₂O₆, and Mg₄Nb₂O₉) are formed on the surface of both alloys. In the middle corrosion stage, a continuous and thick MgO scale is developed, which can partially mitigate the corrosion process. In the late corrosion stage, chloride-induced reactions lead to pronounced active dissolution of the alloys, resulting in substantial mass loss. Additionally, the introduction of Co and Fe into the NiCrMoNb alloy results in the coexistence of phases rich in Nb/Mo- and/or in Fe/Co/Ni/Cr within the alloy, which further induce galvanic corrosion. During the entire corrosion process of 200 h, the corrosion behavior of the NiCrMoNb alloy gradually transforms from being controlled by the diffusion rate of charged particles within the oxide scale to being dominated by the diffusion rate of charged particles in the molten salts. In contrast, the corrosion behavior of the NiCoFeCrMoNb alloy remains relatively stable, with its corrosion rate consistently governed solely by the diffusion kinetics of charged particles within the oxide scale throughout the entire corrosion period.

Key words： NiCrMoNb alloy NiCoFeCrMoNb alloy molten chloride salt molten salt corrosion electrochemistry

收稿日期: 2025-06-09 32134.14.1005.4537.2025.176

ZTFLH:

TK51

基金资助:广西石化资源加工及过程强化技术重点实验室开放课题基金(2024K003);广西研究生教育创新计划(YCSW2025104)

通讯作者: 王艳丽，E-mail：wyl187358@gxu.edu.cn，研究方向为金属材料的腐蚀与防护

Corresponding author: WANG Yanli, E-mail: wyl187358@gxu.edu.cn

作者简介: 卢华轶，女，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.176 或 https://www.jcscp.org/CN/Y2026/V46/I3/730

图1 熔盐腐蚀实验装置示意图

图2 NiCrMoNb和NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2中的腐蚀动力学曲线

图3 NiCrMoNb合金的初始表面形貌及EDS元素面扫描图

图4 NiCoFeCrMoNb合金的初始表面形貌及EDS元素面扫描图

图5 NiCrMoNb合金在700 ℃氩气条件下熔融NaCl-KCl-MgCl2中浸泡不同时间后的XRD谱图

图6 NiCrMoNb合金在700 ℃氩气条件下熔融NaCl-KCl-MgCl2中浸泡不同时间后的截面形貌图和面扫描结果

图7 NiCoFeCrMoNb合金在700 ℃氩气条件下熔融NaCl-KCl-MgCl2中浸泡不同时间后的XRD谱图

图8 NiCoFeCrMoNb合金在700 ℃氩气条件下熔融NaCl-KCl-MgCl2中浸泡不同时间后的截面形貌

图9 NiCrMoNb合金在在700 ℃氩气条件下熔融NaCl-KCl-MgCl2中的Nyquist和Bode 图

图10 NiCoFeCrMoNb合金在在700 ℃氩气条件下熔融NaCl-KCl-MgCl2中的Nyquist 和Bode图

图11 NiCrMoNb和NiCoFeCrMoNb合金在熔融NaCl-KCl-MgCl2中的EIS数据等效电路图

表1 NiCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2中的EIS数据拟合结果

表2 NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2中的EIS数据拟合结果

图12 NiCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2中的腐蚀机理图

图13 NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2中的腐蚀机理图

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