<strong>Ni</strong>含量对<strong>Co-Al-W</strong>合金热腐蚀行为的影响

doi:10.11902/1005.4537.2023.323

中国腐蚀与防护学报

2023, Vol. 43

Issue (6): 1419-1426 CSTR: 32134.14.1005.4537.2023.323 DOI: 10.11902/1005.4537.2023.323

研究报告

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Ni含量对Co-Al-W合金热腐蚀行为的影响

王华¹, 王英杰², 刘恩泽²^,³(

)

^1.海军装备部西安 710021
^2.江苏科技大学材料科学与工程学院镇江 212100
^3.中国科学院金属研究所沈阳 110016

Hot Corrosion Behavior of New Type Co-Al-W Superalloys with Different Ni Contents

WANG Hua¹, WANG Yingjie², LIU Enze²^,³(

)

^1.Department of Naval Equipment, Xi'an 710021, China
^2.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China
^3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

王华, 王英杰, 刘恩泽. Ni含量对Co-Al-W合金热腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2023, 43(6): 1419-1426.
Hua WANG, Yingjie WANG, Enze LIU. Hot Corrosion Behavior of New Type Co-Al-W Superalloys with Different Ni Contents[J]. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1419-1426.

全文: PDF(18428 KB) HTML

摘要:

研究不同Ni含量的Co-9Al-9.5W合金在900 ^oC涂覆75% Na₂SO₄+25% NaCl熔融盐的热腐蚀行为。测试了合金的腐蚀动力学曲线，利用扫面电镜观察腐蚀产物，利用XRD分析腐蚀样品表面产物类型。结果表明，合金的腐蚀进程兼具氧化和硫化的特征；随着合金中Ni含量的增加，合金的抗热腐性能力提高。合金的热腐蚀产物主要由NiO，CoO，Al₂S₃和CoNiO₂组成，并进一步探讨了钴基合金的热腐蚀机制。

关键词 ： Co-Al-W合金, 热腐蚀, Ni, 热腐蚀机制

Abstract：

The hot corrosion behavior of Co-based alloys Co-9Al-9.5W-xNi (x=5, 15, 20, atomic fraction, %) beneath a film of molten salts mixture of 75% Na₂SO₄+25% NaCl in air at 900 °C were investigated by means of mass change measurement, SEM with EDS and XRD. The focus of the research is on the influence of Ni on hot corrosion resistance of the alloy Co-9Al-9.5W and the morphology and composition of the formed corrosion products. The results showed that the hot corrosion of the alloys may be characterized by both sulfidation and oxidation; with the increase of Ni content, the hot corrosion resistance of the alloy could be notably improved. The corrosion products scales on the three Co-based alloys were most composed of NiO, CoO, Al₂S₃ and CoNiO₂. Finally, the hot corrosion mechanism of the Co-based alloy in the presence of 75% Na₂SO₄ and 25% NaCl deposits is also discussed.

Key words： Co-Al-W alloys hot corrosion Ni hot corrosion mechanism

收稿日期: 2023-10-10 32134.14.1005.4537.2023.323

ZTFLH:

TG174

基金资助:科技部重点研发计划(2021YFC2202402);国家自然科学基金(51471079)

通讯作者: 刘恩泽，E-mail: nzliu@imr.ac.cn，研究方向为高温合金

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

作者简介: 王华，男，1978年生，高级工程师

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图1 标准热处理后Co-9Al-9.5W-20Ni的微观组织

图2 Co-Al-W-xNi合金在900 ℃下75% Na2SO4+25% NaCl熔盐中的腐蚀动力学曲线

图3 在900 ℃下75% Na2SO4+25% NaCl熔盐中热腐蚀2、16、32 h后腐蚀产物的XRD图谱

图4 合金在900 °C下75% Na2SO4+25% NaCl熔盐中腐蚀不同时间后的SEM表面形态

图5 3种合金在900 °C下Na2SO4和NaCl的熔盐混合物中热腐蚀32 h后的横截面SEM显微照片

图6 合金A在900 °C下75% Na2SO4+25% NaCl的混合熔盐中热腐蚀32 h后的SEM形貌和EDS谱

图7 合金B在900 °C下75% Na2SO4+25% NaCl的混合熔盐中热腐蚀32 h后的SEM形貌和EDS谱

图8 合金C在900 °C下75% Na2SO4+25% NaCl的混熔盐中热腐蚀32 h后的SEM形貌和EDS谱

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