Pre-treatment and oxidation behavior of sol-gel Co coating on 430 steel in 750°C air with thermal cycling

Dayaghi, A. M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.surfcoat.2012.02.023
  3. Publisher: 2012
  4. Abstract:
  5. Research and development efforts continue to improve oxidation resistance and electrical conductivity of solid oxide fuel cell (SOFC) interconnects. This research evaluates the performance of a ferritic stainless steel (AISI 430 - a candidate SOFC interconnect material) with and without a Co coating (via sol-gel dip coating technique) with various pre-treatments, during cyclic oxidation exposures up to 750°C in laboratory air. A pre-treatment exposure of Co coated samples to a 750°C reducing atmosphere (prior to oxidation exposures) led to the formation of an effective Co-based spinel oxide coating that lowers oxidation rates by more than 40 times, and substantially lowers area specific resistance (ASR) in comparison to uncoated specimens. The development of effective sol-gel Co coatings with reducing pre-treatments, and their evolution within simulated SOFC interconnect environments is presented and discussed
  6. Keywords:
  7. Interconnect ; Sol-gel dip coating ; Solid oxide fuel cell ; Area-specific resistances ; Coated sample ; Cobalt coating ; Cyclic oxidation ; Ferritic stainless steel ; Interconnect materials ; Oxidation behaviors ; Oxidation rates ; Pre-Treatment ; Pre-treatments ; Reducing atmosphere ; Research and development ; Sol-gel dip coating technique ; Solid oxide ; Spinel oxide ; Electric conductivity ; Oxidation ; Protective coatings ; Sol-gel process ; Sol-gels ; Solid oxide fuel cells (SOFC)
  8. Source: Surface and Coatings Technology ; Volume 206, Issue 16 , 2012 , Pages 3495-3500 ; 02578972 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0257897212001156