<strong>Inconel 718</strong>合金在<strong>750 ℃</strong>下不同气氛中的氧化与热腐蚀行为研究

doi:10.11902/1005.4537.2025.260

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1528-1536 CSTR: 32134.14.1005.4537.2025.260 DOI: 10.11902/1005.4537.2025.260

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Inconel 718合金在750 ℃下不同气氛中的氧化与热腐蚀行为研究

叶俊¹, 罗鑫¹, 镇咸生², 李新平³, 谢云¹(

), 彭晓¹

1 南昌航空大学材料科学与工程学院南昌 330063
2 中国航发贵州黎阳航空动力有限公司贵阳 550014
3 南昌职业大学工程技术学院南昌 330500

Corrosion Behavior of Inconel 718 Alloy Without and with a Pre-deposits Film of Salts Mixture at 750 ^oC in Different Atmospheres

YE Jun¹, LUO Xin¹, ZHEN Xiansheng², LI Xinping³, XIE Yun¹(

), PENG Xiao¹

1 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 Liyang Aero Power Co. Ltd. , AECC, Guiyang 550014, China
3 College of Engineering and Technology, Nanchang Vocational University, Nanchang 330500, China

引用本文:

叶俊, 罗鑫, 镇咸生, 李新平, 谢云, 彭晓. Inconel 718合金在750 ℃下不同气氛中的氧化与热腐蚀行为研究[J]. 中国腐蚀与防护学报, 2025, 45(6): 1528-1536.
Jun YE, Xin LUO, Xiansheng ZHEN, Xinping LI, Yun XIE, Xiao PENG. Corrosion Behavior of Inconel 718 Alloy Without and with a Pre-deposits Film of Salts Mixture at 750 ^oC in Different Atmospheres[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1528-1536.

全文: PDF(19038 KB) HTML

摘要:

通过实验研究了Inconel 718合金在750 ℃的空气、CO₂和CO₂-30%H₂O中的氧化行为，以及合金表面涂覆75%Na₂SO₄ + 25%NaCl混合盐后在相同温度的空气、空气-30%H₂O和CO₂-30%H₂O中的热腐蚀行为。结果表明，Inconel 718合金不涂盐时在空气、CO₂和CO₂-30%H₂O中都表现出良好的抗氧化性能，表面氧化产物主要由连续均匀的Cr₂O₃膜组成，厚度分别为0.4 ± 0.1、1.2 ± 0.1和(0.7 ± 0.1) μm。在涂盐后，合金在空气中表现出较差的抗热腐蚀性能，腐蚀膜厚度为(10.2 ± 2.9) μm；在空气-30%H₂O中的腐蚀更严重，腐蚀膜厚度增大至(12.3 ± 3.6) μm。合金在这两种气氛中形成的表面腐蚀膜由Cr₂O₃和少量Fe₂O₃组成，并且疏松多孔，存在大量剥落的迹象，合金内部发生明显的内硫化。但是，涂盐后的合金在CO₂-30%H₂O中合金表现出优异的抗热腐蚀性能，表面形成一层连续的Cr₂O₃保护膜，厚度仅为(1.7 ± 0.4) μm，能为合金基体提供有效的高温防护。

关键词 ： Inconel 718合金, 水蒸气, 高温氧化, 热腐蚀

Abstract：

The corrosion behavior of Inconel 718 alloy without and with a pre-deposits film of salt mixture of 75%Na₂SO₄ + 25%NaCl at 750 ^oC was assessed, in various atmospheres such as air, air-30%H₂O, CO₂ and CO₂-30%H₂O, respectively. The results show that the bare Inconel 718 alloy exhibits outstanding oxidation resistance in the atmospheres: air, CO₂ and CO₂-30%H₂O, and the oxidation products scales are principally composed of a uniform and continuous Cr₂O₃ scale. The corresponding thickness of which is 0.4 ± 0.1, 1.2 ± 0.1 and (0.7 ± 0.1) μm, respectively. Beneath a salt deposits film, the alloy displays poor hot corrosion resistance in air, and the corresponding thickness of the corrosion products scale is (10.2 ± 2.9) μm. The corrosion became more serious as the alloy with pre-deposits film of salts mixture is exposed to air-30%H₂O, and the thickness of the corrosion scale increases to (12.3 ± 3.6) μm. In the above two environments, the formed corrosion products scales are composed of Cr₂O₃ and minor Fe₂O₃. In addition, these scales are loose and porous, accompanied with severe spallation and internal sulfidation. Nevertheless, the alloy with pre-deposits film of salts mixture exhibits superior resistance against the hot corrosion induced by the salts mixture + atmosphere CO₂-30%H₂O. Correspondingly, the corrosion products scale is a continuous Cr₂O₃ scale of only (1.7 ± 0.4) μm in thickness, which provides sufficient protection for the alloy against the aggressive environment.

Key words： Inconel 718 alloy water vapor high-temperature oxidation hot corrosion

收稿日期: 2025-08-18 32134.14.1005.4537.2025.260

ZTFLH:

TG174

基金资助:江西省重点研发计划(20232BBE50007);江西省自然科学基金(20224BAB214018)

通讯作者: 谢云，E-mail：yun.xie@nchu.edu.cn，研究方向为金属材料腐蚀与防护

Corresponding author: XIE Yun, E-mail: yun.xie@nchu.edu.cn

作者简介: 叶俊，男，2001年生，硕士生

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图1 Inconel 718合金电解抛光后的表面形貌

图2 Inconel 718合金在不同条件下腐蚀的质量变化

图3 Inconel 718合金涂盐前后在不同气氛中腐蚀后的XRD图谱

图4 Inconel 718合金不涂盐在不同气氛中氧化500 h后的表面形貌和截面形貌

图5 Inconel 718合金不涂盐时在不同气氛中氧化500 h后的元素EDS面分布

图6 Inconel 718合金涂盐后在不同气氛中腐蚀100 h后的表面形貌和截面形貌

图7 Inconel 718合金涂盐后在不同气氛中腐蚀100 h后的元素EDS面分布

图8 主要合金元素分别与熔融态Na2SO4和NaCl反应的Ellingham-Richardson图

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