Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO3 Solution

Liu, Jingbo; Liu, Yongxin; Meng, Xianqi; Tang, Linfeng; Lei, Xiaowei; Wang, Nan

doi:10.3390/ma18214967

Open AccessCommunication

Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO₃ Solution

by

Jingbo Liu

¹,

Yongxin Liu

²,

Xianqi Meng

^2,3,

Linfeng Tang

⁴,

Xiaowei Lei

²

and

Nan Wang

^2,*

¹

Guiyang AECC Power Investment Casting Co., Ltd., Guiyang 550014, China

²

School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China

³

Ningbo Boway Alloy High-Tech Wire Co., Ltd., Ningbo 315135, China

⁴

Capital Aerospace Machinery Co., Ltd., Beijing 100076, China

^*

Author to whom correspondence should be addressed.

Materials 2025, 18(21), 4967; https://doi.org/10.3390/ma18214967

Submission received: 11 August 2025 / Revised: 20 October 2025 / Accepted: 28 October 2025 / Published: 30 October 2025

(This article belongs to the Special Issue Welding, Joining, and Additive Manufacturing of Metals and Alloys (Third Edition))

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Abstract

Since mechanical processing can introduce stress in the sample, electrochemical dissolution has been utilized to attain shape accuracy in certain materials. However, this technique is rarely applied to laser-repaired Ni-based single-crystal superalloys. In this work, the transpassive dissolution behaviors of an additive manufacturing-repaired Ni-based single crystal superalloy in a 10% NaNO₃ solution were investigated by comparison with the substrate. A significant disparity in dissolution rates was found between the dendritic and interdendritic regions of the substrate, resulting in a rough surface. Conversely, the dissolution of the dendritic and interdendritic regions in the cladding structure occurred nearly simultaneously, leading to a high-quality, smooth surface. This behavior was attributed to the differences in phase dissolution preferences between the substrate and the cladding structure. It indicates that electrochemical dissolution is a promising method for achieving shape accuracy in laser-clad Ni-based single-crystal superalloys.

Keywords: Ni-based single crystal superalloy; laser metal deposition; electrochemical dissolution

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MDPI and ACS Style

Liu, J.; Liu, Y.; Meng, X.; Tang, L.; Lei, X.; Wang, N. Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO₃ Solution. Materials 2025, 18, 4967. https://doi.org/10.3390/ma18214967

AMA Style

Liu J, Liu Y, Meng X, Tang L, Lei X, Wang N. Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO₃ Solution. Materials. 2025; 18(21):4967. https://doi.org/10.3390/ma18214967

Chicago/Turabian Style

Liu, Jingbo, Yongxin Liu, Xianqi Meng, Linfeng Tang, Xiaowei Lei, and Nan Wang. 2025. "Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO₃ Solution" Materials 18, no. 21: 4967. https://doi.org/10.3390/ma18214967

APA Style

Liu, J., Liu, Y., Meng, X., Tang, L., Lei, X., & Wang, N. (2025). Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO₃ Solution. Materials, 18(21), 4967. https://doi.org/10.3390/ma18214967

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Electrochemical Surface Modification of Laser Cladded Ni-Based Single Crystal Superalloy in NaNO₃ Solution

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