Barrier oxide chemistry and hydrogen pick-up mechanisms in zirconium alloys
Artikel i vetenskaplig tidskrift, 2016

The chemistry of barrier oxide layers formed on zirconium alloys was investigated using atom probe tomography (APT). Grain boundary segregation of Fe and Ni was observed. The Zr(Fe, Cr)2 particles maintain a constant Zr:Fe:Cr ratio through the oxide until they reach an oxygen content of approxi- mately 50 at%, when Fe depletion occurs. Enrichment of hydrogen along oxide crystallite boundaries was observed, which is interpreted as a sign of ingress being localized to grain boundaries. TEM revealed poros- ity networks around particles and oxide grain boundaries. It is proposed that pores are local reduction sites where H2 evolves on transition metal sites.

Atom probe tomography

Transmission electron microscopy

Zirconium alloys

Zircaloy-2

Zr-2.5Nb

Hydrogen pick-up

Författare

Gustav Sundell

Chalmers, Fysik, Biologisk fysik

Mattias Thuvander

Chalmers, Fysik, Biologisk fysik

Hans-Olof Andrén

Chalmers, Fysik, Biologisk fysik

Corrosion Science

0010-938X (ISSN)

Vol. 102 490-502

Ämneskategorier

Energiteknik

Metallurgi och metalliska material

Korrosionsteknik

Styrkeområden

Materialvetenskap

DOI

10.1016/j.corsci.2015.11.002