Corrosion Behavior of Al-B4C Composite in Spent Nuclear Fuel Storage Environments

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (5): 419-424 DOI:

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Corrosion Behavior of Al-B₄C Composite in Spent Nuclear Fuel Storage Environments

SHI Jianmin, ZHANG Ling, CHEN Jing, SHEN Chunlei, LEI Jiarong, ZHOU Xiaosong

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 6219001, China

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Abstract Al-B₄C composite is a candidate material of neutron absorption for spent nuclear fuel storage racks. The corrosion behavior of Al-B₄C composite with different surface pre-treatments was examined by immersion test in solutions simulated the pressure water reactor (PWR) and boiling water reactor (BWR) spent nuclear fuel storage environments. Then the surface morphology of the corroded samples was observed by SEM, the elemental distribution and the phase constituent of corrosion products were characterized by EDS and XRD respectively. The results showed that the composite was corroded due to the preferential corrosion of Al and trace elements such as Mg and Fe. After immersion in PWR spent nuclear fuel storage solution, four different corrosion morphologies on the polished sample could be differentiated showing a poor corrosion resistance, which might be related with the Fe distribution in the composite. However, after immersion in BWR storage solution an Al(OH)₃ film formed on the polished sample surface indicating a good corrosion resistance. The pre-anodized samples exhibited mass gain after immersion test in the two storage solutions of PWR and BWR respectively, indicating the best corrosion resistance, which may be due to that the pores of the anodized film was sealed by the formed corrosion products in the solutions.

Key words: Al-B₄C composite material neutron absorption material spent nuclear fuel storage corrosion anodic oxidation

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SHI Jianmin,ZHANG Ling,CHEN Jing,SHEN Chunlei,LEI Jiarong,ZHOU Xiaosong. Corrosion Behavior of Al-B₄C Composite in Spent Nuclear Fuel Storage Environments. Journal of Chinese Society for Corrosion and protection, 2013, 33(5): 419-424.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I5/419

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