In-situ observation of Co-Ce coated metallic interconnect oxidation combined with high-resolution post exposure analysis

Stéphane Poitel, Zhu Jun Wang, Marc Georg Willinger, Jan Van Herle, Cécile Hébert

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Oxidation of Sanergy SSHT steel with Ce-Co coating, used as interconnect material, was observed in-situ in a modified environmental scanning electron microscope (ESEM) at nominal temperature between 800°C and 900°C under 33Pa of oxygen, for different durations (up to 60h). After these in-situ observations, lamellas of the observed target areas were prepared using a focused ion beam (FIB). This allowed the evaluation in the cross section of the final composition of the oxidation layers of the steel by scanning transmission electron microscopy (STEM) and energy dispersive x-ray analysis (EDX), of the same zone observed directly on the surface by ESEM. Results show the diffusion of manganese and iron towards the cobalt coating. Underneath, chromia scale forms. Under the applied conditions, the very thin cerium layer does not prevent the diffusion of other elements from the steel. Niobium (with silicium) and titanium form oxidized precipitates in the steel just below the chromia scale.

Original languageEnglish
Title of host publicationECS Transactions
EditorsS. C. Singhal, T. Kawada
PublisherElectrochemical Society Inc.
Pages1615-1632
Number of pages18
Edition1
ISBN (Electronic)9781607688150, 9781607688150
DOIs
StatePublished - 30 May 2017
Externally publishedYes
Event15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, United States
Duration: 23 Jul 201728 Jul 2017

Publication series

NameECS Transactions
Number1
Volume78
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
Country/TerritoryUnited States
CityHollywood
Period23/07/1728/07/17

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