NaCl对347H和GH3539在熔融硝酸盐中热腐蚀行为的影响

doi:10.11902/1005.4537.2025.082

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1610-1618 CSTR: 32134.14.1005.4537.2025.082 DOI: 10.11902/1005.4537.2025.082

研究报告

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NaCl对347H和GH3539在熔融硝酸盐中热腐蚀行为的影响

彭望¹^,², 陈荐¹, 杨凌旭², 刘会军²(

), 梁建平³, 曾潮流²(

)

1 长沙理工大学能源与动力工程学院长沙 410114
2 松山湖材料实验室东莞 523808
3 中国科学院上海应用物理研究所上海 201800

Effect of NaCl on Hot Corrosion Behavior of 347H Stainless Steel and Ni-based GH3539 Alloy in Molten Nitrate Salts

PENG Wang¹^,², CHEN Jian¹, YANG Lingxu², LIU Huijun²(

), LIANG Jianping³, ZENG Chaoliu²(

)

1 College of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
2 Songshan Lake Materials Laboratory, Dongguan 523808, China
3 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

引用本文:

彭望, 陈荐, 杨凌旭, 刘会军, 梁建平, 曾潮流. NaCl对347H和GH3539在熔融硝酸盐中热腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2025, 45(6): 1610-1618.
Wang PENG, Jian CHEN, Lingxu YANG, Huijun LIU, Jianping LIANG, Chaoliu ZENG. Effect of NaCl on Hot Corrosion Behavior of 347H Stainless Steel and Ni-based GH3539 Alloy in Molten Nitrate Salts[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1610-1618.

全文: PDF(12417 KB) HTML

摘要:

研究了NaCl对347H不锈钢与GH3539镍基合金在600 ℃熔融(Na, K)NO₃中热腐蚀行为的影响。结果表明，NaCl加速了347H和GH3539的热腐蚀，其中对347H的加速作用更为明显。在熔融(Na, K)NO₃中，347H表面能形成富Cr氧化膜，而GH3535表面则形成外层为NiO、中间层为金属Ni和内层为内氧化区的腐蚀产物层。在熔融(Na, K)NO₃中加入NaCl后，Cl向金属基体扩散，使基体合金元素发生氯化反应，破坏了氧化膜与合金基体的结合力，从而加速了腐蚀，且这种加速作用随NaCl含量的升高而增强。

关键词 ：热腐蚀, 347H不锈钢, 镍基GH3539合金, 硝酸盐, 氯化盐

Abstract：

The effect of NaCl on the corrosion behavior of 347H stainless steel and GH3539 nickel-based alloy in molten (Na, K)NO₃ at 600 ^oC has been investigated. It is shown that the addition of NaCl can markedly accelerate the corrosion of 347H and GH3539 in the melt, with a more pronounced effect on 347H. In molten (Na, K)NO₃, 347H can form a Cr-rich oxide scale, while GH3539 produces layered products composed of an outer NiO, a middle metallic Ni, and an inner internal oxidation layer. When NaCl is added to molten (Na, K)NO₃, chlorine produced by the reaction between NaCl and oxides formed on the alloy surface diffuses into the alloy matrix, giving rise to chlorination reactions of alloying elements. This chlorine-induced corrosion weakens the bonding between the oxide scale and the alloy matrix, ultimately leading to accelerated corrosion of both alloys, with the effect enhanced by higher NaCl content.

Key words： hot corrosion 347H stainless steel GH3539 nickel-based alloy nitrate salts chloride salts

收稿日期: 2025-03-11 32134.14.1005.4537.2025.082

ZTFLH:

TG174.4

基金资助:国家重点研发计划(2021YFB3700603)

通讯作者: 刘会军，E-mail：hui_jun_liu@163.com，研究方向为金属的腐蚀与防护曾潮流，E-mail：clzeng@imr.ac.cn，研究方向为金属的腐蚀与防护

Corresponding author: LIU Huijun, E-mail: hui_jun_liu@163.comZENG Chaoliu, E-mail: clzeng@imr.ac.cn

作者简介: 彭望，男，2000年生，硕士生

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表1 347H不锈钢和GH3539合金的化学成分

图1 347H不锈钢和GH3539合金在600 ℃熔融(Na, K)NO3-NaCl中的腐蚀失重曲线

图2 347H不锈钢和GH3539合金在600 ℃熔融(Na, K)NO3中腐蚀1000 h后的表面XRD图谱

图3 347H不锈钢和GH3539合金在600 ℃熔融(Na, K)NO3-1%NaCl中腐蚀不同时间后的表面XRD图谱

图4 347H不锈钢在600 ℃熔融(Na, K)NO3中腐蚀1000 h后的腐蚀产物断面形貌

图5 347H不锈钢在600 ℃熔融(Na, K)NO3-1%NaCl)中腐蚀100 h后的断面形貌

图6 347H不锈钢在600 ℃熔融(Na, K)NO3-1%NaCl中热腐蚀不同时间后的腐蚀产物断面形貌

图7 347H不锈钢在600 ℃熔融(Na, K)NO3-5%NaCl中热腐蚀100和400 h后的腐蚀产物断面形貌

图8 GH3539合金在600 ℃熔融(Na, K)NO3中腐蚀1000 h后的腐蚀产物断面形貌

图9 GH3539合金在600 ℃熔融(Na, K)NO3-1%NaCl中热腐蚀不同时间后的腐蚀产物断面形貌

图10 GH3539合金在600 ℃熔融(Na, K)NO3-5%NaCl热腐蚀100 h和400 h后的断面形貌

图 11 W-Cl2-O2在600 ℃的热力学稳定性图

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