Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Huang, Kaijin; Li, Wei; Pan, Kai; Lin, Xin; Wang, Aihua

doi:10.3390/coatings11010101

Open AccessArticle

Microstructure and Corrosion Properties of La₂Zr₂O₇/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

by

Kaijin Huang

^1,2,3,*,

Wei Li

²,

Kai Pan

¹,

Xin Lin

³ and

Aihua Wang

²

¹

Key Laboratory of Low Dimensional Materials & Application Technology, Xiangtan University, Xiangtan 411105, China

²

State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China

³

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

^*

Author to whom correspondence should be addressed.

Coatings 2021, 11(1), 101; https://doi.org/10.3390/coatings11010101

Submission received: 23 December 2020 / Revised: 5 January 2021 / Accepted: 13 January 2021 / Published: 18 January 2021

(This article belongs to the Special Issue Coatings for High Temperature Applications)

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Abstract

In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La₂Zr₂O₇/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La₂Zr₂O₇ phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La₂Zr₂O₇ phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

Keywords: laser-cladding; La₂Zr₂O₇/NiCoCrAlY thermal barrier coating; Inconel 718 superalloy; corrosion resistance

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MDPI and ACS Style

Huang, K.; Li, W.; Pan, K.; Lin, X.; Wang, A. Microstructure and Corrosion Properties of La₂Zr₂O₇/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding. Coatings 2021, 11, 101. https://doi.org/10.3390/coatings11010101

AMA Style

Huang K, Li W, Pan K, Lin X, Wang A. Microstructure and Corrosion Properties of La₂Zr₂O₇/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding. Coatings. 2021; 11(1):101. https://doi.org/10.3390/coatings11010101

Chicago/Turabian Style

Huang, Kaijin, Wei Li, Kai Pan, Xin Lin, and Aihua Wang. 2021. "Microstructure and Corrosion Properties of La₂Zr₂O₇/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding" Coatings 11, no. 1: 101. https://doi.org/10.3390/coatings11010101

APA Style

Huang, K., Li, W., Pan, K., Lin, X., & Wang, A. (2021). Microstructure and Corrosion Properties of La₂Zr₂O₇/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding. Coatings, 11(1), 101. https://doi.org/10.3390/coatings11010101

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Microstructure and Corrosion Properties of La₂Zr₂O₇/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

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