Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Comparison Study of Polymer and Ti Sol-Gel Carbon Coating on Ti for PEMFC Bipolar Plates

고분자전해질 연료전지용 Ti 분리판을 위한 고분자와 Ti Sol-Gel 탄소코팅의 비교 연구

  • Won-Seog Yang (Mobility Parts Research Team, R&D Division of Hyundai-Steel) ;
  • Jae-Ho Lee (Mobility Parts Research Team, R&D Division of Hyundai-Steel) ;
  • Hee-Suk Roh (Mobility Parts Research Team, R&D Division of Hyundai-Steel) ;
  • Ju-Hyun Yoo (Mobility Parts Research Team, R&D Division of Hyundai-Steel) ;
  • Chul-Min Park (Organic Division, Color&Dispersion Unit, R&D Center of KCC) ;
  • Su-Yeon Lee (Surface & Nano Materials Division, KIMS) ;
  • Sung-Mo Moon (Surface & Nano Materials Division, KIMS)
  • 양원석 (현대제철 연구개발본부 모빌리티부품연구팀) ;
  • 이재호 (현대제철 연구개발본부 모빌리티부품연구팀) ;
  • 노희석 (현대제철 연구개발본부 모빌리티부품연구팀) ;
  • 유주현 (현대제철 연구개발본부 모빌리티부품연구팀) ;
  • 박철민 (KCC 중앙연구소 유기부분 칼라&분산) ;
  • 이수연 (한국재료연구원 나노표면재료연구본부 전기화학연구실) ;
  • 문성모 (한국재료연구원 나노표면재료연구본부 전기화학연구실)
  • Received : 2023.12.04
  • Accepted : 2023.12.21
  • Published : 2023.12.29
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Abstract

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 TiO2 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 90° bend test to check formability. The contact resistance of the TiO2 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 TiO2 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 TiO2 binder coating had many pores and irregularities internally (around 10 ~ 100 nm) and on the surface (0.1 ~ 2 ㎛). We considered that these pores and irregularities contributed to the lower corrosion resistance.

Keywords

Acknowledgement

이 연구는 2023년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원에 의한 연구입니다(20015756, 대형 상용차용 연료전지 스택 내구성 확보 운전기술 개발).

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