Electrochemical corrosion of a multiphase alloy/oxide composite nuclear waste form

•Multiphase alloy waste form composed of an oxide and two alloy phases.•Electrochemical methods and microscopy used to assess the corrosion behavior.•Results of OCP, LPR, Tafel, and PD scans indicate contributions from the two alloy phases and an inert oxide phase.•All electrochemical responses were...

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Bibliographic Details
Published in:Corrosion science 2021-05, Vol.184 (C), p.109358, Article 109358
Main Authors: Gattu, V.K., Ebert, W.L., Indacochea, J.E., Frank, S.M.
Format: Article
Language:English
Subjects:
A: Stainless steel
Acid solutions
B: EIS
C: Acid corrosion
Ceramic
Composite materials
Corrosion
Corrosion rate
Electrical properties
Electrochemical corrosion
Electrochemical impedance spectroscopy
Intermetallics
Modeling studies
Multiphase
Passive films
Polarization
Pourbaix diagram
Radioactive wastes
SEM
Surface properties
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Summary:•Multiphase alloy waste form composed of an oxide and two alloy phases.•Electrochemical methods and microscopy used to assess the corrosion behavior.•Results of OCP, LPR, Tafel, and PD scans indicate contributions from the two alloy phases and an inert oxide phase.•All electrochemical responses were sensitive to small changes in the relative areas of the three phases.•EIS indicated changes in electrical properties of surface were caused by each electrochemical method. Long-term corrosion rates of waste forms must be predicted for the range of environmental conditions that could occur during geologic disposal. Several standard electrochemical methods and microscopy were applied to a multiphase alloy/oxide composite material to study the effects of multiple phases on test responses. Electrochemical impedance spectroscopy showed application of those methods altered the electrical properties of the stabilized surfaces and the corrosion rates. Those methods provide qualitative indications of the corrosion behavior, but alternative methods that do not disturb the surface properties are required to reliably quantify the corrosion rates of multiphase waste forms for long-term disposal assessments.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109358