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주철 알루미늄 합금의 Hot Dip Aluminizing시 흑연 및 금속간화합물 층의 형성 거동
한광식 ( Kwang Sic Han ),강용주 ( Yong Joo Kang ),강문석 ( Mun Seok Kang ),강성민 ( Sung Min Kang ),김진수 ( Jin Su Kim ),손광석 ( Kwang Suk Son ),김동규 ( Dong Gyu Kim ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.2
Hot dip aluminizing (HDA) is widely used in industry for improving corrosion resistance of material. The formation of intermetallic compound layers during the contact between dissimilar materials at high temperature is common phenomenon. Generally, intermetallic compound layers of Fe2Al5 and FeAl3 are formed at the Al alloy and Fe substrate interface. In case of cast iron, high contact angle of graphite existed in the matrix inhibits the formation of intermetallic compound layer, which carry with it the disadvantage of a reduced reaction area and mechanical properties. In present work, the process for the removal of graphite existed on the surface of specimen has been investigated. And also HDA was proceeded at 800oC for 3 minutes in aluminum alloy melt. The efficiency of graphite removal was increased with the reduction of particle size in sanding process. Graphite appears to be present both in the region of melting followed by re-solidification and in the intermetallic compound layer, which could be attributed to the fact that the surface of cast iron is melted down by the formation of low melting point phase with the diffusion of Al and Si to the cast iron. Intermetallic compound layer consisted of Fe(Al,Si)3 and Fe2Al5Si, the layer formed at cast iron side contained lower amount of Si.