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Structure and Hot Corrosion Behavior of an Al-Co-Y Co-deposited Coating on TiAl Alloy

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Abstract

The hot corrosion behavior of Al-Co-Y co-deposited coatings on TiAl alloy was investigated in 25% NaCl + 75% K2SO4 molten salt at 850 °C. Results show that O, S and other corrosive media are preferentially corroded by the α2 phase of the TiAl matrix, generating corrosion products with poor density and adhesion, resulting in rapid corrosion. The Al-Co-Y co-deposited coating specimens form a dense Al2O3 film during the hot corrosion incubation, which effectively improves the anti-hot corrosion performance of TiAl alloy. During hot corrosion, the Al2O3 film is dissolved and ruptured under the action of mixed salts, losing its protective properties.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51961003), the Major Project of Science and Technology Department of Sichuan province (No. 2022YFSY0036), the Major Project of Science and Technology Department of Shaanxi Province (No. 2020GY-324), the Project of Science and Technology Department of Yibin (No. 2021GY-006), the Project of Yibin Vocational and Technical College (YBZYSC18-12, ZRKY21ZD-09), and the Project of the Key Laboratory of Mechanical Structure Optimization & Material Application Technology of Luzhou (SCHYZSA-2022-01, SB-2022-01, SCHYZSB-2022-02)

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Authors and Affiliations

  1. College of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong, 643000, China

    Zekun Wei, Xuan Li, Wei Lv, Bai Ming & Sheng Lai

  2. College of Electrical and Mechanical Engineering, North Minzu University, Yinchuan, 750021, China

    Yongquan Li

  3. School of Automobile and Rail Transit, Yibin Vocational and Technical College, Yibin, 644003, China

    Fuhua Liu

  4. The Key Laboratory of Mechanical Structure Optimization and Material Application Technology of Luzhou, Luzhou, 646300, China

    Zekun Wei, Xuan Li, Wei Lv & Xing Liu

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  1. Zekun Wei
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Correspondence to Xuan Li.

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Wei, Z., Li, X., Lv, W. et al. Structure and Hot Corrosion Behavior of an Al-Co-Y Co-deposited Coating on TiAl Alloy. J. of Materi Eng and Perform 32, 4796–4806 (2023). https://doi.org/10.1007/s11665-022-07481-1

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