Enhancement of Aqueous Corrosion of Zircaloy-4 Due to Hydride Precipitation at the Metal-Oxide Interface

2009 ◽  
pp. 566-566-26 ◽  
Author(s):  
AM Garde
Keyword(s):  
Metal Oxide ◽  
Oxide Interface ◽  
Aqueous Corrosion ◽  
Hydride Precipitation

Mechanisms of Oxidation of Fuel Cladding Alloys Revealed by High Resolution APT, TEM and SIMS Analysis

2012 ◽  
Vol 1383 ◽  
Author(s):  
Chris R. M. Grovenor ◽  
Na Ni ◽  
Daniel Hudson ◽  
Sean S. Yardley ◽  
Katie L. Moore ◽  
...  
Keyword(s):  
High Resolution ◽  
Metal Oxide ◽  
Oxide Layer ◽  
Electrochemical Impedance ◽  
Complex Structure ◽  
Oxygen Stoichiometry ◽  
Aqueous Environment ◽  
Oxide Interface ◽  
Aqueous Corrosion ◽  
Sims Analysis

ABSTRACTAqueous corrosion of zirconium alloys has become the major factor limiting prolonged fuel campaigns in nuclear plant. Studies using SEM, TEM and electrochemical impedance measurements have been interpreted as showing a dense inner-most oxide layer, and an increased thickness of the layer has been correlated to a better corrosion resistance. Many authors have reported that an ‘intermediate layer’ at the metal oxide interface has a complex structure or/and stochiometry different to that of both the bulk oxide and bulk metal, sometimes claimed to be a suboxide phase. Diffraction evidence has suggested the presence of both cubic ZrO and rhombohedral Zr3O phases, and compositional analysis has revealed similar variations in local oxygen stoichiometry.We have carried out a systematic investigation of the structure and chemistry of the metal/oxide interface in samples of commercial ZIRLO corroded for times up to 180 days. We have developed new experimental techniques for the study of these interfaces both by Electron Energy Loss Spectroscopy (EELS) analysis in the Transmission Electron Microscope (TEM) and by Atom Probe Tomography (APT), and exactly the same samples have been investigated by both techniques. Our results show the development of a clearly defined suboxide layer of stoichiometry close to ZrO, and the subsequent disappearance of this layer at the first of the characteristic ‘breakaway’ transitions in the oxidation kinetics. We can correlate this behaviour with changes in the structure of the oxide layer, and particularly the development of interconnected porosity that links the corroding interface with the aqueous environment. Using high resolution SIMS analysis of isotopically spiked samples we demonstrate the penetration of the oxidising species through these porous outer oxide layers.

Surface to bulk charge transfer at an alkali metal/metal oxide interface

2003 ◽  
Vol 547 (1-2) ◽  
pp. L859-L864 ◽  
Author(s):  
R Lindsay ◽  
E Michelangeli ◽  
B.G Daniels ◽  
M Polcik ◽  
A Verdini ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Alkali Metal ◽  
Metal Oxide ◽  
Oxide Interface ◽  
Metal Metal ◽  
Bulk Charge

High temperature behavior of the metal/oxide interface of ferritic stainless steels

2012 ◽  
Vol 59 ◽  
pp. 148-156 ◽  
Author(s):  
Jérôme Issartel ◽  
Sébastien Martoia ◽  
Frédéric Charlot ◽  
Valérie Parry ◽  
Guillaume Parry ◽  
...  
Keyword(s):  
High Temperature ◽  
Metal Oxide ◽  
Stainless Steels ◽  
Temperature Behavior ◽  
Oxide Interface ◽  
Ferritic Stainless Steels ◽  
High Temperature Behavior

KINETICS OF THIN OXIDE FILM GROWTH ON METAL CRYSTALS

2000 ◽  
Vol 07 (01n02) ◽  
pp. 135-139 ◽  
Author(s):  
V. P. ZHDANOV ◽  
P. R. NORTON
Keyword(s):  
Oxide Film ◽  
Metal Oxide ◽  
Metal Ions ◽  
Film Growth ◽  
Phase Interface ◽  
Oxide Interface ◽  
Thin Oxide Film ◽  
Thin Oxide Films ◽  
Thin Oxide ◽  
Kinetics Of

A seminal model describing the kinetics of growth of thin oxide films on metal crystals was proposed by Cabrera and Mott (CM). The model is based on the assumption that the growth is limited by the field-facilitated activated jumps of metal ions located in steps on the metal–oxide interface. We generalize the CM model by (i) exploring the interplay of jumps of metal ions from the step and terrace sites at the metal–oxide interface, and (ii) scrutinizing the processes at the oxide–gas-phase interface. The former factor is found to change the physical meaning of the parameters in the CM growth law. The latter factor results in modification of the growth law. In particular, the oxidation kinetics becomes dependent on the O2 pressure. More specifically, the oxidation rate is predicted to increase with increasing pressure. This effect is, however, rather weak and becomes progressively weaker with increasing oxide film thickness.

Evaluation of mechanical properties of irradiated zirconium alloys in the vicinity of the metal-oxide interface

2019 ◽  
Vol 742 ◽  
pp. 842-850 ◽  
Author(s):  
Aaron W. Colldeweih ◽  
Adrienn Baris ◽  
Philippe Spätig ◽  
Sousan Abolhassani
Keyword(s):  
Mechanical Properties ◽  
Metal Oxide ◽  
Zirconium Alloys ◽  
Oxide Interface
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