슬러리 코팅법에 의한 스테인레스 스틸 표면에서의 알루미늄 확산막 제조 및 용융탄산염 내에서의 내식 특성 연구 = A Study on Protection of Stainless Steel Substrate against Corrosion in Molten Carbonate by Formation of Aluminum Diffusive Layer Using a Slurry Coating Method

다국어 초록 (Multilingual Abstract)

A stainless steel separator for a molten carbonate fuel cell is usually coated with aluminum diffusive layer to protect its surface against corrosion by the molten carbonate at high temperatures. In this study, a relatively simple method was devised to form the aluminum diffusive layer on a stainless steel substrate. Slurry coating of aluminum on the substrate followed by heat treatment under reducing atmosphere at $650\~800^{\circ}C$ produced the aluminum diffusive layer of $25\~80{\mu}m$ thickness. The thickness of aluminum diffusive layer increased with increasing the temperature or duration of the heat-treatment. The corrosion resistance against molten carbonate under oxidizing atmosphere was significantly improved by aluminum diffusive layer formed by the sluny painting and heat treatment method. Moreover, the sample prepared in this study showed corrosion behavior similar to the sample with aluminum diffusive layer prepared by ion vapor deposition and heat treatment.