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Vol.35, No.1, 128 ~ 136, 1997
Title
Research Paper - Surface Treatment : The Formation of Protective Composite Layers on Monel 400 by Hot Dipping in Zr - Ni Alloy Melt
조선욱Sun Wook Cho, 박상현Sang Hyeun Park, 이임열Rhim Youl Lee
Abstract
83Zr-17Ni alloy coatings on Monel 400 substrate were produced by the hot dipping. The coating layer of 30 ㎛ thickness was obtained at 1050℃ for 1 min. dipping. The formation of Zr₂Cu was found at the substrate/coating interface during the hot dipping. The selective oxidation during the heat treatment led to the formation of Zr-rich oxide on the coating layer containing Zr. It was found that the coating layer was consisted of an outer ZrO₂ layer and an inner oxide/metal composite layer with a conversion heat treatment at 1030℃ for 20hr. These oxide and composite layers resulted in an increase on the hardness. The oxidation rate was decreased with hot dipping and also with conversion. It was proved that the resistance to spallation was enhanced by coating.
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