Influence of Micro-Arc Oxidation Time on Structure and Properties of MAO/Cr Composite Coatings

doi:10.11900/0412.1961.2022.00510

Acta Metall Sin

2024, Vol. 60

Issue (5): 691-698 DOI: 10.11900/0412.1961.2022.00510

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Influence of Micro-Arc Oxidation Time on Structure and Properties of MAO/Cr Composite Coatings

WANG Zheng¹, WANG Zhenyu¹, WANG Aiying¹^,², YANG Wei³, KE Peiling¹^,²(

)

1 Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China

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WANG Zheng, WANG Zhenyu, WANG Aiying, YANG Wei, KE Peiling. Influence of Micro-Arc Oxidation Time on Structure and Properties of MAO/Cr Composite Coatings. Acta Metall Sin, 2024, 60(5): 691-698.

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Abstract

Since the 2011 Fukushima nuclear accident, much attention has been given to accident-tolerant fuel cladding coating. In this study, micro-arc oxidation (MAO) and high-power pulsed magnetron sputtering were employed to deposit MAO/Cr composite coatings on the surface of Zirlo alloy. The effects of micro-arc oxidation time on the microstructure, mechanical properties, and high-temperature steam oxidation resistance of MAO/Cr composite coatings were investigated. Results showed that when the micro-arc oxidation time was enhanced from 3 min to 9 min, the (200)-plan texture coefficient increased from 83% to 100%. Moreover, with the increase in micro-arc oxidation time, the composite coating fracture toughness first increased, and then decreased after reaching a peak of 4.64 MPa⋅m^1/2 in 6 min. After steam oxidation at 900°C for 1 h, the composite coating systems showed delamination. Among them, MAO3min/Cr and MAO6min/Cr coatings gained less weight, whereas MAO9min/Cr coating gained more weight and formed a large number of microcracks on its surface cross-section. It can be observed that the obtained composite coating with a 6-min micro-arc oxidation has both excellent mechanical properties and outstanding resistance to high-temperature steam oxidation.

Key words: micro-arc oxidation high-power pulsed magnetron sputtering microstructure mechanical property high-temperature steam oxidation resistance

Received: 12 October 2022

ZTFLH:

TG174.4

Fund: CAS Interdisciplinary Innovation Team(292020000008)

Corresponding Authors: KE Peiling, professor, Tel: (0574)86694790, E-mail: kepl@nimte.ac.cn

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	WANG Zheng
	WANG Zhenyu
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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00510 OR https://www.ams.org.cn/EN/Y2024/V60/I5/691

Fig.1 Schematics of micro-arc oxidation (MAO) (a) and high-power pulsed magnetron sputtering (HiPIMS) (b) deposition systems (MFC—mass flow controller)

Table 1 Deposition parameters of Cr coatings

Fig.2 XRD spectra (a) and texture coefficients (b) of three composite coatings (T₍₁₁₀₎, T₍₂₀₀₎, and T₍₂₁₁₎ represent (110), (200), and (211) texture, respectively)

Fig.3 Surface (a1, a2, b1, b2, c1, c2) and cross-sectional (a3, b3, c3) SEM images of the three composite coatings (a1-a3) MAO3min/Cr (b1-b3) MAO6min/Cr (c1-c3) MAO9min/Cr

Fig.4 Hardness curve and corresponding indentation morphologies (insets) of Cr coating and MAO/Cr composite coatings

Table 2 Fracture toughness (K_IC) of the three composite coatings

Fig.5 Mass gain (a), XRD spectra (b), and texture coefficients (c) of the three composite coatings after high-temperature steam oxidation

Fig.6 Surface SEM images of the three composite coatings oxidized at 900^oC for 1 h (Insets are partial enlarged views)
(a) MAO3min/Cr
(b) MAO6min/Cr
(c) MAO9min/Cr

Table 3 EDS results of chemical compositions of the points in Fig.6

Fig.7 Cross-sectional SEM images and EDS line analyses of the three composite coatings oxidized at 900^oC for 1 h
(a) MAO3min/Cr (b) MAO6min/Cr (c) MAO9min/Cr

Fig.8 Cross-sectional morphologies of the three corrosive composite coatings etched by HF sloution
(a) MAO3min/Cr (b) MAO6min/Cr (c) MAO9min/Cr

Fig.9 Schematic of oxidation process of the MAO9min/Cr composite coating on Zirlo substrate at 900^oC in steam environment

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