리튬용융염계 산화성분위기에서 Al-Y 코팅한 Haynes 263의 고온 부식거동

조수행; 임종호; 정준호; 서중석; 박성원; Soo-Hang Cho; Jong-Ho Lim; Jun-Ho Chung; Chung-Seok Seo; Seoung-Won Park

Korean Journal of Materials Research, Vol.15, No.3, 155-160, March, 2005

DOI10.3740/MRSK.2005.15.3.155 Export Citation

리튬용융염계 산화성분위기에서 Al-Y 코팅한 Haynes 263의 고온 부식거동

Hot Corrosion Behavior of Al-Y Coated Haynes 263 in Lithium Molten Salt under Oxidation Atmosphere

조수행^†, 임종호, 정준호, 서중석, 박성원

한국원자력연구소

Soo-Hang Cho^†, Jong-Ho Lim, Jun-Ho Chung, Chung-Seok Seo, and Seoung-Won Park

Korea Atomic Energy Research Institute, Daejeon 305-353, Korea

E-mail:

The electrolytic reduction of spent oxide fuel involves the liberation of oxygen in a molten LiCl electrolyte, which results in a chemically aggressive environment that is very corrosive fir typical structural materials. So, it is essential to choose the optimum material f3r the process equipment handling molten salt. In this study, the corrosion behavior of Al-Y coated Haynes 263 in a molten salt of LiCl?Li 2 O under oxidation atmosphere was investigated at 650 ? C for 72\~168 hours. The corrosion rate of Al-Y coated Haynes 263 was low while that of bare Haynes 263 was high in a molten salt of LiCl?Li 2 O . Al-Y coated Haynes 263 improved the corrosion resistance better than bare Haynes 263 alloy. An Al oxide layer acts as a protective film which Prohibits Penetration of oxygen. Corrosion Products were formed Li(Ni,Co)O 2 and LiTiO 2 on bare Haynes 263, but LiAlO 2 ,Li 5 Fe 5 O 8 andLiTiO 2 on Al-Y coated Haynes 263.

Keywords:molten salt corrosion;hot corrosion;lithium molten salt;Al-Y coating

[References]

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[1] Kohl FJ, Santoro GJ, Steams CA, Fryburg GC, Rosner DE, J. Electrochem. Soc., 126, 1054 (1979)

[2] Kameswari S, Oxid. Met., 26, 33 (1973)

[3] Rahmel A, Engell HJ, Corrosion, 18, 320 (1969)

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

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

[6] Kochergin MM, Stolyarava GI, J. Appl. Chem., 29, 789 (1956)

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

[8] Colom F, Bodalo A, Corros. Sci., 12, 73 (1972)

[9] Smyrl WH, Blanckburn MJ, Corrosion, 31, 370 (1972)

[10] Gill CB, Staumanis ME, Schlechten WE, J. Electrochem. Soc., 102, 42 (1955)

[11] Kim SW, Son YH, J. Kor. Soc. Heat Treat., 5, 241 (1992)

[12] Hocking MG, Vasantasree V, Sidky PS, 'Metallic and Ceramic Coating', Longman Scientific and Technical, Essax, UK (1989) (1989)

[13] Griffiths WT, Pfeil LB, U. K. Patent no 459848, (1937) (1937)

[14] Geobel JA, Pettit FS, Goward GW, Met. Trans., 4, 261 (1973)

[15] Latham EP, Meadowcroft DB, Pinder L, Mater. Sci. Tech., 5, 813 (1989)

[16] Brill U, Grossmann GK, Corrosion Behavior of Weld Overlays of the New Alloy 50, in: Corrosion 2001, Houston, TX, USA, 11-16 March 2001, Nace, paper 170 (2001)

[17] Stringer J, Surf. Coat. Tech., 108-109, 1 (1998)

[18] Park CH, Oh DH, Cho KM, Park IM, J. Kor. Inst. Met. & Mater., 37, 570 (1999)

[19] Bouhanek K, Oquab D, Pieraggi B, Mat. Sci. Forum, 251-254, 34 (1997)