不同温度下<strong>DD10</strong>合金钎焊接头热腐蚀行为研究

doi:10.11902/1005.4537.2024.400

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1361-1370 CSTR: 32134.14.1005.4537.2024.400 DOI: 10.11902/1005.4537.2024.400

研究报告

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不同温度下DD10合金钎焊接头热腐蚀行为研究

赵欣宇¹^,², 刘恩泽¹(

), 张功¹, 赵媛³, 宁礼奎¹, 信昕¹, 贾丹¹, 刘伟华¹, 谭政¹^,²

1 中国科学院金属研究所沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016
3 中国船舶工业物资东北有限公司沈阳 110011

Hot Corrosion Behavior of Brazed Joints of Single Crystal Ni-based DD10 Alloy Beneath Na₂SO₄ Deposit in Air at 850 and 900 ℃

ZHAO Xinyu¹^,², LIU Enze¹(

), ZHANG Gong¹, ZHAO Yuan³, NING Likui¹, XIN Xin¹, JIA Dan¹, LIU Weihua¹, TAN Zheng¹^,²

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3 China Shipbuilding Equipment & Materials Northeast Corporation Limited, Shenyang 110011, China

引用本文:

赵欣宇, 刘恩泽, 张功, 赵媛, 宁礼奎, 信昕, 贾丹, 刘伟华, 谭政. 不同温度下DD10合金钎焊接头热腐蚀行为研究[J]. 中国腐蚀与防护学报, 2025, 45(5): 1361-1370.
Xinyu ZHAO, Enze LIU, Gong ZHANG, Yuan ZHAO, Likui NING, Xin XIN, Dan JIA, Weihua LIU, Zheng TAN. Hot Corrosion Behavior of Brazed Joints of Single Crystal Ni-based DD10 Alloy Beneath Na₂SO₄ Deposit in Air at 850 and 900 ℃[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1361-1370.

全文: PDF(27261 KB) HTML

摘要:

采用涂盐法研究DD10合金钎焊接头在850和900 ℃下的抗热腐蚀行为，并探讨其腐蚀机理。结果表明：在850 ℃/200 h腐蚀后，DD10合金和钎焊接头的腐蚀层厚度分别为12和14 μm，二者的抗腐蚀性能相差不大；900 ℃/200 h腐蚀后，合金和钎焊接头的腐蚀层厚度分别为28和44 μm，腐蚀机理发生改变，钎焊接头抗热腐蚀性能劣于基体。850和900 ℃的腐蚀产物均主要由金属氧化物、尖晶石相以及硫化物构成，900 ℃的腐蚀产物出现850 ℃未含有的CrTaO₄、(Ni, Co)Co₂O₄、Ni₃S₂。在焊接过程中焊缝区域形成的析出相会消耗抗腐蚀元素，增大相界面，降低钎焊接头的抗热腐蚀性能。

关键词 ：单晶高温合金, DD10合金, 热腐蚀, 钎焊, 析出相

Abstract：

The hot corrosion behavior of brazed joints of single crystal Ni-based DD10 alloy beneath Na₂SO₄ deposits in air at 850 and 900 ℃ was studied. The results indicate that after 200 h exposure at 850 ℃, the corrosion layer thickness of the DD10 alloy and the brazed joint was 12 and 14 μm, respectively, demonstrating their similar corrosion resistance. However, after 200 h exposure at 900 ℃, the corrosion layer thickness increased to 28 μm for the master alloy and 44 μm for the brazed joint, indicating a change in the corrosion mechanism, with the brazed joint exhibiting inferior hot corrosion resistance compared to the master alloy. The corrosion products at both temperatures consist mainly of metal oxides, spinel phases, and sulfides. Notably, at 900 ℃, additional corrosion products, including CrTaO₄, (Ni, Co)Co₂O₄, and Ni₃S₂, were identified, which were absent at 850 ℃. During the welding process, the precipitated phases in the weld zone consume corrosion-resistant elements, increase the phase boundaries, and consequently reduce the hot corrosion resistance of the brazed joint.

Key words： single crystal superalloy DD10 alloy hot corrosion brazing precipitation phase

收稿日期: 2024-12-20 32134.14.1005.4537.2024.400

ZTFLH:

TG172

基金资助:国家科技重大专项(E110A104)

通讯作者: 刘恩泽，E-mail：nzliu@imr.ac.cn，研究方向为高温结构材料

Corresponding author: LIU Enze, E-mail: nzliu@imr.ac.cn

作者简介: 赵欣宇，男，1999年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.400 或 https://www.jcscp.org/CN/Y2025/V45/I5/1361

图1 DD10合金组织与钎焊后焊缝局部区域的微观组织

表1 图1b中各标记点处EPMA成分分析结果

图2 DD10合金及钎焊接头在850和900 ℃下200 h热腐蚀后的宏观形貌

图3 DD10合金和钎焊接头在850 ℃下200 h热腐蚀的动力学曲线

图4 DD10合金和钎焊接头在900 ℃下200 h热腐蚀的动力学曲线

图5 DD10合金和钎焊接头850 ℃下200 h热腐蚀后的XRD谱图

图6 DD10合金在850 ℃下200 h热腐蚀后的截面SEM形貌及EDS元素面扫描

图7 DD10钎焊接头在850 ℃下200 h热腐蚀后的截面SEM形貌及EDS元素面扫描

图8 DD10合金和钎焊试样在900 ℃下200 h热腐蚀后的XRD谱图

图9 DD10合金在900 ℃下200 h热腐蚀后的截面SEM形貌及EDS元素面扫描图

图10 DD10钎焊接头在900 ℃下200 h热腐蚀后的截面SEM形貌及EDS元素面扫描图

Reaction	ΔG $850 o C$ / kJ·mol^-1
8/3Al + 2O₂ (g) = 4/3Al₂O₃	-1760.877
2Ti + 2O₂ (g) = 2TiO₂	-1481.985
8/3Cr + 2O₂ (g) = 4/3Cr₂O₃	-1126.937
8/3Al + Na₂SO₄ (s) = 4/3Al₂O₃ + Na₂S (l)	-1113.022
2Ti + Na₂SO₄ (s) = 2TiO₂ + Na₂S (l)	-834.130
8/3Cr + Na₂SO₄ (s) = 4/3Cr₂O₃ + Na₂S (l)	-479.081
6TiO₂ + Na₂SO₄ (s) = Na₂Ti₆O₁₃ + SO₃ (g)	140.699
Cr₂O₃ + Na₂SO₄ (s) = Na₂Cr₂O₄ + SO₃ (g)	317.719
Al₂O₃ + Na₂SO₄ (s) = 2NaAlO₂ + SO₃ (g)	326.557

表2 850 ℃下Ti、Cr和Al与O及固态Na2SO4反应的标准Gibbs自由能

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