Corrosion Behavior of Cold-sprayed B4C/Al Composite Coating in Boric Acid Solution

doi:10.11902/1005.4537.2024.244

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 164-172 DOI: 10.11902/1005.4537.2024.244

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Corrosion Behavior of Cold-sprayed B₄C/Al Composite Coating in Boric Acid Solution

ZHAO Lijia¹^,², CUI Xinyu¹, WANG Jiqiang¹(

), XIONG Tianying¹

1 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

ZHAO Lijia, CUI Xinyu, WANG Jiqiang, XIONG Tianying. Corrosion Behavior of Cold-sprayed B₄C/Al Composite Coating in Boric Acid Solution. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 164-172.

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Abstract

Due to the excellent neutron absorption properties, cold-sprayed B₄C/Al composite coating shows a good application prospect in the field of spent fuel storage. However, there are few studies on the corrosion behavior of cold-sprayed B₄C/Al coating in boric acid solution. In this paper, the corrosion behavior of cold-sprayed B₄C/Al coating coated 316L stainless steel in boric acid solution was studied by immersion test, electrochemical workstation, and EIS as well as SEM + EDS and XRD. Results show that the interface between B₄C particles in the cold-sprayed coating is weak, and the boric acid solution tend to preferentially corrode along the interparticle interface, thus results in the corrosion of the coating matrix. Post heat treatment can effectively improve the structure of cold sprayed B₄C/Al coating and enhanced interfacial bonding between particles. As a result, the corrosion resistance of B₄C/Al coating in boric acid solution was improved.

Key words: cold spray B₄C/Al corrosion resistance heat treatment

Received: 07 August 2024 32134.14.1005.4537.2024.244

ZTFLH:

TG174

Fund: Youth Innovation Promotion Association of Chinese Academy of Sciences(2023199)

Corresponding Authors: WANG Jiqiang, E-mail: jqwang11s@imr.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.244 OR https://www.jcscp.org/EN/Y2025/V45/I1/164

Fig.1 Macro morphologies of B₄C/Al coating after immersion in boric acid solution for different time

Fig.2 XRD patterns (a) and amplified views (b) of the coating sample before and after immersion in boric acid solution for 768 h

Fig.3 Micro morphologies of B₄C/Al coating after immersion in boric acid solution for 12 h (a), 24 h (b), 48 h (c), 192 h (d) and 768 h (e), and amplified view of local area in Fig.3d (f)

Fig.4 BSE images (a, b) and SE image of the cross section of corrosion pit (c), and EDS analysis of the areas 1 and 2 marked in Fig.4a (d)

Fig.5 Weight loss curves of cold-sprayed B₄C/Al coating during immersion in boric acid solution for 768 h

Fig.6 Schematic illustration of corrosion process of B₄C/Al coating in boric acid solution

Fig.7 EBSD images of cold-sprayed (a, b) and heat-treated (c, d) B₄C/Al coating, showing the distributions of grain size (a, c) and dislocation density (b, d)

Fig.8 Polarization curves (a) and Nyquist plots (b) of cold-sprayed and heat-treated coating samples

Table 1 Corrosion potentials and corrosion current densities of cold-sprayed and heat-treated coating samples

Fig.9 Equivalent circuit diagram for fitting of Nyquist plots

Table 2 Fitting parameters of EIS of cold-sprayed and heat-treated coating samples

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