Hydrothermal Corrosion of SiC Coupons Suppressed by Magnetron Sputtered Cr Coatings

Author:

Dai Shuxin12ORCID,Zou Zhiming23ORCID,Wang Renda12ORCID,Li Yuhang2ORCID,Li Bingsheng4ORCID,Ge Fangfang25ORCID,Li Peng25ORCID

Affiliation:

1. Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

2. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

3. Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China

4. State Key Laboratory for Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, 621010 Sichuan, China

5. Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, China

Abstract

SiC-based components are sometimes susceptible to aqueous dissolution in LWR coolant environments. To address this issue, ~10 μm thick Cr coatings was deposited on reaction-bonded silicon carbide (RBSC) plates by magnetron sputtering. Corrosion behavior of Cr-coated SiC and -uncoated SiC coupons was studied by immersing in autoclave (345°C and 16.5 MPa). The weight loss of the Cr coated SiC coupons (3.02% after the 93-days) in the autoclave tests was effectively reduced due to their Cr-coated surfaces, in contrast to the uncoated ones (20.4% after the 78-days). Moreover, microstructural and compositional evolutions were examined by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. It was revealed that a continuous and dense Cr2O3 layer formed on the surface after the hydrothermal corrosion, which can suppress the in-diffusion of corrosive medium.

Funder

Sichuan Science and Technology Program

Publisher

Hindawi Limited

Subject

Instrumentation,Atomic and Molecular Physics, and Optics

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