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Oxidation of Co- and Ce-nanocoated FeCr steels: A microstructural investigation

Sead Canovic (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Jan Froitzheim (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Rakshith Nugehalli Sachitanand (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Maria Nikumaa (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Mats Halvarsson (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Lars-Gunnar Johansson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Surface & Coatings Technology (0257-8972). Vol. 215 (2013), p. 62-74.
[Artikel, refereegranskad vetenskaplig]

The effect of novel Co and Ce nanocoatings on oxidation behaviour and chromium volatilization from a commercial Fe-22Cr steel (Sanergy HT) developed for solid oxide fuel cell interconnect applications is investigated. Three different coatings (10 nm Ce, 640 nm Co and 10 nm Ce + 640 nm Co) are studied. Uncoated and nanocoated samples are exposed isothermally at 850 C in the air with 3% H2O for 168 h. The detailed microstructure of the different coatings is investigated. The surface morphology and microstructure of the oxide scales are characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and energy dispersive X-ray analysis (EDX). Cross-section TEM thin foils are prepared by using a combined FIB/SEM (focused ion beam/scanning electron microscope) instrument. A 640 nm cobalt coating strongly inhibits Cr volatilization but has only minor effects on oxidation rate. In contrast, a 10 nm Ce coating decreases the oxidation rate but has no significant effects on chromium volatilization. Combining the two coatings, i.e., applying a 640 nm Co coating on top of the 10 nm Ce, effectively reduces Cr evaporation and slows down the rate of alloy oxidation.

Nyckelord: Solid oxide fuel cell, Interconnect, Transmission electron microscopy, Cr volatilization, Coating, oxide fuel-cells, ferritic stainless-steels, sofc interconnect, applications, high-temperature oxidation, mn-o system, metallic, interconnects, spinel coatings, cobalt, additions, behavior



Denna post skapades 2013-04-05. Senast ändrad 2016-07-15.
CPL Pubid: 175398

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Kemi

Chalmers infrastruktur