Surface Reaction and Transport in Oxides Formed on FeCrAl Alloys in High Temperature Nitridation Environments
Övrigt konferensbidrag, 2017

An extended experimental study on corrosion of commercial FeCrAl alloys in predominantly N-2 atmosphere at high temperatures raises fundamental questions concerning nitrogen permeation through oxide scale components, each commonly perceived to constitute a robust barrier. State-of-the-art microscopy combined with DFT calculations is employed to unravel the underlying mechanisms for how chromia nodules support nitrogen dissociation and subsequently act windows for internal nitridation. A similar analysis addressed the role of yttria nodules shown to exhibit apparent expulsion of nitrogen, while favoring rapid alumina growth underneath the nodules. In this case, as for the slowly growing bare alpha alumina scale, the origin for the protection towards nitrogen permeation was identified as the inability to satisfy the necessary conditions for N-2 dissociation.

scales

Surface reaction

Oxide transport properties

growth

DFT

Författare

Christine Geers

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Vedad Babic

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Lars-Gunnar Johansson

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Itai Panas

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Ämneskategorier

Metallurgi och metalliska material

DOI

10.1007/978-3-319-51493-2_36

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Senast uppdaterat

2021-05-21