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Surface Reaction and Transport in Oxides Formed on FeCrAl Alloys in High Temperature Nitridation Environments

Christine Geers (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Vedad Babic (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Lars-Gunnar Johansson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Itai Panas (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Tms 2017 146th Annual Meeting & Exhibition Supplemental Proceedings (2367-1181). p. 387-392. (2017)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: Oxide transport properties, Surface reaction, DFT, growth, scales


Conference: 146th TMS Annual Meeting and Exhibition Location: San Diego, CA Date: FEB 26-MAR 02, 2017 978-3-319-51492-5



Denna post skapades 2017-07-12. Senast ändrad 2017-10-03.
CPL Pubid: 250669

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Metallurgi och metalliska material

Chalmers infrastruktur