Investigation of electrophoretic deposition as a method for coating complex shaped steel parts in solid oxide cell stacks

B. Talic*, A. C. Wulff, S. Molin, K. B. Andersen, P. Zielke, H. L. Frandsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Electrophoretic deposition (EPD) is a promising method for coating complex shaped interconnects and contact components for solid oxide fuel cells and electrolyzers. In this work, we employ a combination of finite element modelling and experiments to assess the effect of substrate curvature on the fabrication of a Mn1.5Co1.5O4 coating by EPD. The coating is deposited on steel substrates machined to create a well-defined curvature and on a Crofer 22 H steel grid. We find that post-deposition sintering of the coated steel substrate may lead to crack formation in concave surfaces, while a defect-free coating is achieved at convex surfaces. The formation of cracks is found to depend on a complex interplay between the coating thickness, the sintering procedure, and the substrate curvature radius. Oxidation testing in air at 750 °C showed that the Mn1.5Co1.5O4 coating reduced the oxidation rate of the Crofer 22 H steel grid. Sintering the coating by a two-step reduction and re-oxidation procedure resulted in a more protective coating showing a greater tendency for crack healing compared to sintering the coating in air only. 
Original languageEnglish
Article number125093
JournalSurface and Coatings Technology
Volume380
Number of pages8
ISSN0257-8972
DOIs
Publication statusPublished - 2019

Keywords

  • Solid oxide fuel cell
  • Interconnect
  • Finite element model
  • Electrophoretic deposition
  • Coting
  • Oxidation

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