전해환원공정에서 Y2O3 코팅층의 부식거동

Corrosion Behavior of Y2O3 Coating in an Electrolytic Reduction Process

조수행, 홍순석, 강대승, 정명수, 박병홍, 허진목, 이한수

Abstract

The electrolytic reduction of a spent oxide fuel involves a liberation of the oxygen in a molten LiCl electrolyte, which results in a chemically aggressive environment that is too corrosive for typical structural materials. Accordingly, it is essential to choose the optimum material for the processing equipment that handles the high molten salt. In this study, hot corrosion studies were performed on bare as well as coated superalloy specimens after exposure to lithium molten salt at 675 for 216 h under an oxidizing atmosphere. The IN713LC superalloy specimens were sprayed with an aluminized NiCrAlY bond coat and then with an Y2O3 top coat. The bare superalloy reveals an obvious weight loss due to spalling of the scale by the rapid scale growth and thermal stress. The chemical and thermal stability of the top coat has been found to be beneficial for increasing to the corrosion resistance of the structural materials for handling high temperature lithium molten salts.

Key Words : 플라즈마 코팅, 이트리아 탑 코팅, 고온부식, 구조재료, 전해환원, Plasma spray coating, yttria top coat, hot corrosion, structural material, electrolytic reduction

Reference

JNFCWT

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Korean Radioactive
Waste Society (KRS)

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