산화성 고온 리튬용융염계 분위기에서 Pyro-Carbon의 부식거동

임종호; 최정묵; Jong-Ho Lim; Jeong-Mook Choi

Korean Journal of Materials Research, Vol.23, No.2, 123-127, February, 2013

DOI10.3740/MRSK.2013.23.2.123 Export Citation

산화성 고온 리튬용융염계 분위기에서 Pyro-Carbon의 부식거동

Corrosion Behavior of Pyro-Carbon in Hot Lithium Molten Salt Under an Oxidation Atmosphere

임종호, 최정묵^{1, †}

(주)현대제철
¹(주)진합

Jong-Ho Lim, and Jeong-Mook Choi^{1, †}

Heavy Plate R&D Team, HYUNDAI-STEEL Technical Research Center, Dangjin 343-711, Korea
¹Jinhap Co., Ltd., Taejon 306-220, Korea

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The electrolytic reduction of a spent oxide fuel involves liberation of the oxygen in a molten LiCl electrolyte, which is a chemically aggressive environment that is too crosive for typical structural materials. Therefore, it is essential to choose the optimum material for the process equipment for handling a molten salt. In this study, the corrosion behavior of pyro-carbon made by CVD was investigated in a molten LiCl-Li2O salt under an oxidation atmosphere at 650 oC and 750 oC for 72 hours. Pyro-carbon showed no chemical reactions with the molten salt because of its low wettability between pyro-carbon and the molten salt. As a result of XRD analysis, pyro-carbon exposed to the molten salt showed pure graphite after corrosion tests. As a result of TGA, whereas the coated layer by CVD showed high anti-oxidation, the non-coated layer showed relatively low anti-oxidation. The stable phases in the reactions were C(S), Li2CO3(S), LiCl(l), Li2O at 650 oC and C(S), LiCl(l), Li2O(S) at 750 oC. Li2CO(S) was decomposed at 750 oC into Li2O(S) and CO2(g).

Keywords:pyro-carbon;oxidation;hot corrosion. lithium molten salt

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[2] Ishitsuka T, Nose K, Corros. Sci., 44, 247 (2002)

[3] Mohanty BP, Shores DA, Corros. Sci., 46, 2893 (2004)

[4] Spiegel M, Biedenkopf P, Grabke HJ, Corros. Sci., 39, 1193 (1997)

[5] Mitsushima S, Kamiya N, Ota KI, J. Electrochem. Soc., 137, 2713 (1990)

[6] Ruh A, Spiegel M, Corros. Sci., 48, 679 (2006)

[7] Copson HR, J. Electrochem. Soc., 100, 257 (1953)

[8] Colom F, Bodalo A, Corros, Sci., 12, 731 (1972)

[9] Ren X, Wang F, Surf. Coat. Technol., 201, 30 (2006)

[10] Guo MH, Wang QM, Ke PL, Gong J, Sun C, Huang RF, Wen LS, Surf. Coat. Technol., 200, 3942 (2006)

[11] Batista C, Portinha A, Ribeiro RM, Teixeira V, Oliveira CR, Surf. Coat. Technol., 200, 6783 (2006)

[12] Turkdogan ET, Physical Chemistry of High temperature Technology, p. 5-24, Academic Press, New York, USA. (1980)