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Pre-coated Ce/Co-coated steel: Mitigating Cr vaporization, increasing corrosion resistance at competitive cost

Hannes Falk Windisch (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; I. Mertzidis ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan Froitzheim (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
ECS Transactions. 14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015, held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage, Glasgow, United Kingdom, 26-31 July 2015 (1938-5862). Vol. 68 (2015), 1, p. 1617-1623.
[Konferensbidrag, refereegranskat]

Cr vaporization and oxide scale growth are probably the two most detrimental degradation mechanisms associated to Cr2O3-forming alloys as interconnect material in SOFC. Both issues can be improved by the application of coatings. However, the use of coatings increase material cost. To reduce coating costs it is suggested that large amounts of steel can be coated before shaping the pre-coated material into an interconnect. The present study investigates the effectiveness of thin Ce and Co coatings on the cost effective steel AISI 441 with respect to Cr vaporization and corrosion resistance. Furthermore, the effect of mechanical deformation of the coated steel is examined. The results revealed that when the pre-coated steel is deformed, large cracks are formed. However, upon exposure those cracks can heal forming a continuous surface oxide rich in Co and Mn. As an effect of the rapid healing, no increase in Cr vaporization was measured.



Denna post skapades 2015-09-22.
CPL Pubid: 222981

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Kemi

Chalmers infrastruktur