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Microstructure and hot corrosion behavior of Al-Ce-Y coatings on DZ125 nickel-based alloy prepared by pack cementation process

DZ125 镍基合金表面Al-Ce-Y 渗层的组织及抗热腐蚀性能

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Abstract

In order to improve the hot corrosion resistance of DZ125 alloy, Ce-Y modified aluminum coatings were prepared on DZ125 alloy by pack cementation process at 950 °C for 2 h. The microstructure, phase constitution and formation mechanism of the coatings were investigated. The hot corrosion behaviors of DZ125 alloy and the coatings in molten salt environment of 25%K2SO4+75%Na2SO4 (mass fraction) at 900 °C were studied. Results show that the obtained Al-Ce-Y coatings were mainly composed of Al3Ni2, Al3Ni and Cr7Ni3, with a thickness of about 120 μm. After hot corrosion test, DZ125 alloy suffered catastrophic hot corrosion and serious internal oxidation and internal sulfidation arose. Two layers of corrosion products formed on surfaces of DZ125 alloy, including the outer layer consisting of Cr2O3 and NiCr2O4, and the inner layer of Al2O3, Ni3S2 and Ni-base solid solution. After being coated with Al-Ce-Y coating, the hot corrosion resistance of DZ125 alloy is improved notably, due to the formation of a dense scale mainly consisting of Al-rich Al2O3 in the coating layer.

摘要

采用扩散渗方法在 DZ125 合金表面制备了 Al-Ce-Y 渗层。分析了渗层的组织结构和形成机制, 对比研究了 DZ125 合金基体及渗层在 900 °C 的 25%K2SO4+75%Na2SO4 熔盐(质量分数 wt. %)中的 热腐蚀行为,探讨了其腐蚀速率和腐蚀机理。结果表明:经 950 °C 保温 2 h 所制备的Al-Ce-Y 渗层厚 约 120 μm,主要由 Al3Ni2、Al3Ni 和少量 Cr7Ni3 相组成。在 K2SO4+Na2SO4 熔盐中,DZ125 合金腐蚀 产物膜分为两层,外层主要为 Cr2O3 和 NiCr2O4,内层主要为 Al2O3、Ni3S2 和镍基固溶体,内氧化和 内硫化是其失效的主要原因; Al-Ce-Y 渗层在热腐蚀的过程中,渗层表面形成了致密的富Al 的 Al2O3 膜层,显著提高了DZ125 合金的抗热腐蚀性能。

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Authors and Affiliations

  1. School of Materials Science & Engineering, North Minzu University, Yinchuan, 750021, China

    Yong-quan Li  (李涌泉), Ji-lin Li  (李吉林), Chun Qin  (秦春), Liang Jiang  (蒋亮) & Gui-hong Geng  (耿桂宏)

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  1. Yong-quan Li  (李涌泉)
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  2. Ji-lin Li  (李吉林)
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  3. Chun Qin  (秦春)
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  4. Liang Jiang  (蒋亮)
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  5. Gui-hong Geng  (耿桂宏)
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Correspondence to Yong-quan Li  (李涌泉).

Additional information

Foundation item: Project(51961003) supported by the National Natural Science Foundation of China; Project(NGY2018-148) supported by the Science and Technology Research of Ningxia Colleges, China; Project(NZ16083) supported by Key Program of Natural Science Foundation of Ningxia, China

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Li, Yq., Li, Jl., Qin, C. et al. Microstructure and hot corrosion behavior of Al-Ce-Y coatings on DZ125 nickel-based alloy prepared by pack cementation process. J. Cent. South Univ. 27, 381–387 (2020). https://doi.org/10.1007/s11771-020-4303-4

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  • DOI: https://doi.org/10.1007/s11771-020-4303-4

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