Barrier oxide chemistry and hydrogen pick-up mechanisms in zirconium alloys
Journal article, 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

Hydrogen pick-up


Transmission electron microscopy

Zirconium alloys



Gustav Sundell

Chalmers, Physics, Materials Microstructure

Mattias Thuvander

Chalmers, Physics, Materials Microstructure

Hans-Olof Andrén

Chalmers, Physics, Materials Microstructure

Corrosion Science

0010-938X (ISSN)

Vol. 102 490-502

Subject Categories

Energy Engineering

Metallurgy and Metallic Materials

Corrosion Engineering

Areas of Advance

Materials Science



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