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고분자전해질 연료전지용 Ti 분리판을 위한 고분자와 Ti Sol-Gel 탄소코팅의 비교 연구
양원석 ( Won-seog Yang ),이재호 ( Jae-ho Lee ),노희석 ( Hee-suk Roh ),유주현 ( Ju-hyun Yoo ),박철민 ( Chul-min Park ),이수연 ( Su-yeon Lee ),문성모 ( Sung-mo Moon ) 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.6
In this work, we performed a comparative study examining two coatings on Ti Gr.1 for use in fuel cell bipolar plates. The coatings consisted of carbon black as the conductor along with acrylic polymer and Ti Sol-Gel binder as the binder. Ti Sol-Gel that had precipitated as TiO<sub>2</sub> in areas impregnated between carbon black gaps, thereby acting as a binder for carbon black and serving as a polymer coating. Neither of the coatings peeled off during the 90o bend test to check formability. The contact resistance of the TiO<sub>2</sub> coating was found to be lower than that of the polymer binder coating. Moreover, due to coating shrinkage (denser) that occurred during the heat treatment process, the TiO<sub>2</sub> binder coating showed almost the same level of corrosion resistance, as measured by potentiostatic and EIS tests, despite being thinner than the polymer coating. However, both the polymer binder coating and the TiO<sub>2</sub> binder coating had many pores and irregularities internally (around 10 ~ 100 nm) and on the surface (0.1 ~ 2 μm). We considered that these pores and irregularities contributed to the lower corrosion resistance.