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| 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 |
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Cite this article:
YE Jun, LUO Xin, ZHEN Xiansheng, LI Xinping, XIE Yun, PENG Xiao. Corrosion Behavior of Inconel 718 Alloy Without and with a Pre-deposits Film of Salts Mixture at 750 oC in Different Atmospheres. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1528-1536.
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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.
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Received: 18 August 2025
32134.14.1005.4537.2025.260
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| Fund: Jiangxi Provincial Key Research and Development Program(20232BBE50007);Jiangxi Provincial Natural Science Foundation(20224BAB214018) |
Corresponding Authors:
XIE Yun, E-mail: yun.xie@nchu.edu.cn
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