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arXiv · 1810.08604

Corrosion of Si, C, and SiC in molten salt

Jianqi Xi·Hao Jiang·Cheng Liu·Dane Morgan·Izabela Szlufarska
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Abstract

Corrosion of Si, C, and SiC in fluoride salt has been studied by ab initio molecular dynamics. The standard dissolution potential for Si is found to be smaller (easier to corrode) than that of C. The dissolved Si attracts F- ions and forms SiF62-, whereas the dissolved C species forms neutral CF4 molecules. A swapping mechanism is identified for the initial corrosion stage, where Si first comes to the surface and then is dissolved, leaving behind chain- and ring-like C structures. A strategy to suppress SiC corrosion is also discussed based on Be doping, including avoiding Be2C formation.

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Jianqi Xi, Hao Jiang, Cheng Liu, Dane Morgan, Izabela Szlufarska. 2018-10-19. Corrosion of Si, C, and SiC in molten salt. https://arxiv.org/abs/1810.08604

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