Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Comparison of Corrosion Resistance between $Al_{2}O_{3}$and YSZ Coatings against High Temperature LiCl-$Li_{2}O$ Molten Salt

Lee, Ho-Young;Baik, Kyeong-Ho

  • Published : 20091000
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Abstract

In this study, the high-temperature corrosion resistance of plasma-sprayed ceramic oxide coatings has been evaluated in a LiCl-$Li_{2}O$ molten salt under an oxidizing environment. $Al_{2}O_{3}$ and YSZ coatings were manufactured by atmospheric plasma spraying onto a Ni alloy substrate. Both the plasma-sprayed $Al_{2}O_{3}$ and YSZ coatings had a typical splat quenched microstructure which contained various types of defects, including incompletely filled pores, inter-splat pores and intra-splat microcracks. Corrosion resistance was evaluated by the thickness reduction of the coating as a function of the immersion time in the LiCl-$Li_{2}O$ molten salt at a temperature of 650 °C. A linear corrosion kinetic was found for the $Al_{2}O_{3}$ coating, while no thickness variation with time occurred for the YSZ coating. The ceramic oxide coatings were reacted with LiCl-$Li_{2}O$ molten salt to form a porous reaction layer of LiAl, $Li_{5}AIO_{4}$ and $Li_{5}AIO_{8}$ for the $Al_{2}O_{3}$ coating and a dense reaction layer of non-crystalline phase for the YSZ coating. The reaction products were also formed along the inside coating of the porous channel. The superior corrosion resistance of the YSZ coating was attributed to the formation of a dense protective oxide layer of non-crystalline reaction products on the surface and at the inter-splat pores of the coating.

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