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Hydrogen isotope permeation through structural materials is a key issue for developing nuclear fusion energy, which will cause fuel loss and radioactive pollution. Developing ceramic coatings with high thermal shock and hydrogen resistance is an effective strategy to solve this issue. In this work, a layer-structured Cr/CrxN coating was successfully fabricated by a facile electroplating-based nitridation technique, which is easy, facile, and applicable to coating complex-shaped substrates. The Cr/CrxN coating, composed of a bottom Fe/Cr interdiffusion zone, a middle Cr layer, and a top CrxN layer, exhibits high bonding strength, high anti-thermal-shock ability, and high deuterium permeation resistance. Its bonding strength achieves 43.6 MPa. The Cr/CrxN coating remains intact even after suffering 300 thermal shock cycles under a 600 ℃–water condition. Through optimizing the nitridation temperature, the Cr/CrxN coating achieves a deuterium permeation reduction factor (PRF) as high as 3599 at 500 ℃. Considering its scalable fabrication technique and considerable properties, the developed Cr/CrxN coating may serve as a novel high-performance hydrogen permeation barrier in various fields.


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Layer-structured Cr/CrxN coating via electroplating-based nitridation achieving high deuterium resistance as the hydrogen permeation barrier

Show Author's information Liyu ZHENG1Heping LI1( )Jun ZHOU1Xinluo TIAN1Zhongyang ZHENG1Long WANG2Xinyun WANG1Youwei YAN1
State Key Laboratory of Materials Processing and Die & Mould Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Southwestern Institute of Physics, Chengdu 610225, China

Abstract

Hydrogen isotope permeation through structural materials is a key issue for developing nuclear fusion energy, which will cause fuel loss and radioactive pollution. Developing ceramic coatings with high thermal shock and hydrogen resistance is an effective strategy to solve this issue. In this work, a layer-structured Cr/CrxN coating was successfully fabricated by a facile electroplating-based nitridation technique, which is easy, facile, and applicable to coating complex-shaped substrates. The Cr/CrxN coating, composed of a bottom Fe/Cr interdiffusion zone, a middle Cr layer, and a top CrxN layer, exhibits high bonding strength, high anti-thermal-shock ability, and high deuterium permeation resistance. Its bonding strength achieves 43.6 MPa. The Cr/CrxN coating remains intact even after suffering 300 thermal shock cycles under a 600 ℃–water condition. Through optimizing the nitridation temperature, the Cr/CrxN coating achieves a deuterium permeation reduction factor (PRF) as high as 3599 at 500 ℃. Considering its scalable fabrication technique and considerable properties, the developed Cr/CrxN coating may serve as a novel high-performance hydrogen permeation barrier in various fields.

Keywords: electrodeposition, thermal shock resistance, Cr, hydrogen permeation, CrxN

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Publication history

Received: 21 April 2022
Revised: 03 September 2022
Accepted: 06 September 2022
Published: 29 November 2022
Issue date: December 2022

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© The Author(s) 2022.

Acknowledgements

This work was supported by the National MCF Energy R&D Program (Grant No. 2018YFE0313300), the National Natural Science Foundation of China (Grant No. 51402116), and the Fundamental Research Funds for the Central Universities (Grant Nos. 2018KFYYXJJ028 and 2019KFYXMBZ045). The authors thank Analytical and Testing Center of Huazhong University of Science and Technology for support.

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