고분자전해질 연료전지 분리판용 316 스테인리스강의전기전도도에 미치는 Nb, Ti 첨가 및 표면처리 효과 (Effects of Nb and Ti Addition and Surface Treatments on the Electrical Conductivityof 316 Stainless Steel as Bipolar Plates for PEMFC)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 45권 / 1호 / 44 ~ 50페이지
· 저자명 : 이석현, 김정헌, 김민철, 천동현, 위당문

초록

Nb and Ti were added to 316 stainless steel, and then heat-treatments and surface treatments
were performed on the 316 stainless steel and the Nb- and Ti-added alloys. All samples indicated enhanced
electrical conductivity after surface treatments, whereas they showed low electrical conductivity before surface
treatments due to the existence of non-conductive passive film on the alloy surface. In particular, the Nb- and
Ti-added alloys showed remarkable enhancement of electrical conductivity compared to the original alloy, 316
stainless steel. Surface characterization revealed that small carbide particles formed on the alloy surface after
surface treatments, while the alloys indicated flat surface structure before surface treatments. Cr23C6 mainly
formed on the 316 stainless steel, and NbC and TiC mainly formed on the Nb- and Ti-added alloys,
respectively. We attribute the enhanced electrical conductivity after surface treatments to the formation of
these carbide particles, possibly acting as a means of electro-conductive channel through the passive film.
Furthermore, NbC and TiC are supposed to be more effective carbides than Cr23C6 as electro-conductive
channels of stainless steel.

영어초록

Nb and Ti were added to 316 stainless steel, and then heat-treatments and surface treatments
were performed on the 316 stainless steel and the Nb- and Ti-added alloys. All samples indicated enhanced
electrical conductivity after surface treatments, whereas they showed low electrical conductivity before surface
treatments due to the existence of non-conductive passive film on the alloy surface. In particular, the Nb- and
Ti-added alloys showed remarkable enhancement of electrical conductivity compared to the original alloy, 316
stainless steel. Surface characterization revealed that small carbide particles formed on the alloy surface after
surface treatments, while the alloys indicated flat surface structure before surface treatments. Cr23C6 mainly
formed on the 316 stainless steel, and NbC and TiC mainly formed on the Nb- and Ti-added alloys,
respectively. We attribute the enhanced electrical conductivity after surface treatments to the formation of
these carbide particles, possibly acting as a means of electro-conductive channel through the passive film.
Furthermore, NbC and TiC are supposed to be more effective carbides than Cr23C6 as electro-conductive
channels of stainless steel.

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