Evaluation of electrodeposited Mn-Co protective coatings on Crofer 22 APU steel

Sebastian Molin*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Interconnects used in Solid Oxide Cells stacks require protective coatings to lower their parabolic rate constant and block chromium evaporation (on the air side). In this work four different protective coatings on steel are evaluated for their high temperature corrosion resistance and electrical conductivity. A commercial electroplating process was used for the preparation of coatings with different Mn/Co ratios on Crofer 22 APU steel. Oxidation of samples was performed in air at 800°C for 1000 hours. Postmortem analysis of the coated samples was performed by scanning electron microscopy and x-ray diffractomettry. Based on the results, influence of the Co/Mn ratio on the resulting corrosion properties are discussed. Parabolic rate constant of the coated samples is the lowest for the MnCo sample, whereas electrical resistance is the lowest for the Co sample, which has a corrosion rate similar to the not-coated alloys.
Original languageEnglish
JournalInternational Journal of Applied Ceramic Technology
Volume15
Issue number2
Pages (from-to)349-360
ISSN1546-542X
DOIs
Publication statusPublished - 2018

Keywords

  • Coatings
  • Microstructure
  • Solid oxide fuel cell
  • Spinels

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