DZ40M和K452高温合金在NaCl熔盐中的循环热腐蚀行为研究

doi:10.11902/1005.4537.2022.082

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 280-288 CSTR: 32134.14.1005.4537.2022.082 DOI: 10.11902/1005.4537.2022.082

中国腐蚀与防护学报编委、青年编委专栏

本期目录 | 过刊浏览

DZ40M和K452高温合金在NaCl熔盐中的循环热腐蚀行为研究

申聚宝¹, 崔宇²(

), 刘莉¹, 刘叡¹, 孟凡帝¹, 王福会¹

^1.东北大学沈阳材料科学国家实验室东北大学联合研究分部沈阳 110819
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Cyclic Hot Corrosion Behavior of DZ40M and K452 Superalloys Beneath Molten Deposit NaCl

SHEN Jubao¹, CUI Yu²(

), LIU Li¹, LIU Rui¹, MENG Fandi¹, WANG Fuhui¹

^1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

采用涂盐法研究钴基DZ40M和镍基K452高温合金的循环热腐蚀行为。利用失量法、XRD、SEM、EDS、划痕、二维轮廓等测试手段，表征了DZ40M和K452的循环热腐蚀失效过程，对比分析了两种高温合金失效行为差异的原因。结果表明：15周期后，K452的抗循环热腐蚀性能优于DZ40M，原因在于K452中Al、Ti、Ni元素含量更高，一方面生成的外层NiTiO₃可以有效阻挡熔盐侵蚀，另一方面内层Al₂O₃保证了腐蚀产物膜与基体紧密结合。

关键词 ： DZ40M, K452, NaCl熔盐, 循环热腐蚀

Abstract：

The cyclic hot corrosion behavior of cobalt based DZ40M and nickel based K452 superalloys beneath molten deposit NaCl in air at 900 ℃ was studied by means of gravimetric method, XRD, SEM, EDS, scratch instrument and two-dimensional profilometer. The results of 15 cycle testing revealed that K452 is superior to DZ40M in corrosion resistance, which may be ascribed to the higher content of Al, Ti and Ni of K452 alloy. In other word, the formed external scale of NiTiO₃ on K452 alloy can effectively prevent molten salt corrosion, while the inner scale of Al₂O₃ ensures the close bonding between the corrosion product scale and the matrix.

Key words： DZ40M K452 NaCl molten salt cyclic hot corrosion

收稿日期: 2022-03-23 32134.14.1005.4537.2022.082

ZTFLH:

TG174

基金资助:国家重点研发计划(2017YFB0702303)

作者简介: 申聚宝，男，1996年生，硕士生

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引用本文:

申聚宝, 崔宇, 刘莉, 刘叡, 孟凡帝, 王福会. DZ40M和K452高温合金在NaCl熔盐中的循环热腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 280-288.
Jubao SHEN, Yu CUI, Li LIU, Rui LIU, Fandi MENG, Fuhui WANG. Cyclic Hot Corrosion Behavior of DZ40M and K452 Superalloys Beneath Molten Deposit NaCl. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 280-288.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.082 或 https://www.jcscp.org/CN/Y2023/V43/I2/280

图1 DZ40M和K452合金的金相组织

图2 DZ40M和K452在900 ℃下循环热腐蚀动力学曲线

图3 DZ40M和K452合金试样循环热腐蚀不同周次后的宏观形貌

图4 DZ40M和K452合金不同周次循环热腐蚀后的表面XRD谱

图5 DZ40M合金经不同周次循环热腐蚀后的截面形貌及元素面分布

图6 DZ40M合金经1和15周次循环热腐蚀后的表面形貌及能谱分析结果

图7 K452合金经不同周次循环热腐蚀后的截面形貌及元素面分布

图8 K452合金经不同周次循环热腐蚀后的表面形貌及能谱分析结果

图9 DZ40M和K452合金经不同周次循环热腐蚀后的表面粗糙度及表面粗糙度对比

图10 K452合金经不同周次循环热腐蚀后氧化膜/基体界面结合力

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