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Vol.43, No.6, 449 ~ 455, 2005
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| Title |
| Hot Corrosion Behavior of Superalloys in Lithium Molten Salt |
| 주수행 Soo Haeng Cho , 임종호 Jong Ho Lim , 박성빈 Sung Bin Park , 정기정 Ki Jung Jung , 박성원 Seong Won Park |
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| Abstract |
| In the development of an advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling the molten salt. In this study, the corrosion behavior of Inconel alloys and Incoloy 800H in a molten salt of LiCl-Li2O under an oxidation atmosphere has been investigated at 650℃ for 24~312 hours. The order of the corrosion rate was Inconel 600 < Inconel 601 < Incoloy 800H < Incnel 690. Inconel 600 showed the highest corrosion resistance among the examined superalloys and Inconel 690 exhibited the highest corrosion rate. The corrosion products of Inconel 600 and Inconel 601 were Cr2O3 and NiFe2O4, and for Incoloy 800H they were Cr2O3 and FeCr2O4. In the case of Inconel 690, a single layer of Cr2O3 was formed in the early stage of the corrosion and an outer layer of NiFe2O4 and an inner layer of Cr2O3 were formed with an increase of the corrosion time. Most of the outer scales of the superalloys were spalled and the unspalled scale adherent to a substrate is composed of three layers. The outer layer, the middle one and the inner one were Fe, Cr, and Ni-rich oxide, respectively. Inconel 600 showed a localized corrosion behavior and Inconel 601, 690 and Incoloy 800H showed a uniform corrosion behavior. A Ni addition improves the corrosion resistance and high Cr and/ or Fe deteriorates the corrosion resistance. |
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| Key Words |
| Hot molten salt, Molten salt corrosion, Corrosion behavior, Hot corrosion |
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