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In-Situ Synchrotron X-ray Characterization of Corrosion Products in Zr Artificial Pits in Simulated Physiological Solutions

DOI: 10.1149/2.0671714jes DOI Help

Authors: Yue Zhang (University of Birmingham) , Owen Addison (University of Birmingham) , Petre Flaviu Gostin (University of Birmingham) , Alexander Morrell (Aston Institute of Materials Research, Aston University; Diamond Light Source) , Angus J. M. C. Cook (University of Birmingham) , Alethea Liens (Université de Lyon) , Jing Wu (University of Birmingham) , Konstantin Ignatyev (Diamond Light Source) , Mihai Stoica (ETH Zurich) , Alison Davenport (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The Electrochemical Society , VOL 164 , PAGES C1003 - C1012

State: Published (Approved)
Published: December 2017
Diamond Proposal Number(s): 13963

Open Access Open Access

Abstract: Corrosion products generated in artificial pits of zirconium were characterized in–situ by synchrotron X-ray diffraction and X-ray absorption near edge structure (XANES) in physiological saline, with and without addition of 4% albumin and/or 0.1% H2O2. Zr metal fragments and tetragonal ZrO2 particles were detected in aggregated black corrosion products away from the corrosion front. At the corrosion front, a ZrOCl2⋅8H2O salt layer of a few hundreds of microns thickness was formed. Coarsened ZrOCl2⋅8H2O crystallites were found farther out into the solution. The Zr solution species were confirmed to be in a tetravalent state by XANES. TEM imaging of the corrosion products revealed heterogeneity of the morphology of the Zr metal fragments and confirmed their size to be less than a few microns. The formation and speciation of Zr corrosion products were found not affected by the presence of H2O2 and/or albumin in physiological saline. Furthermore, bulk Zr electrochemistry identified that the presence of H2O2 and/or albumin did not affect passive current densities and pitting potentials of the bulk Zr surface. Therefore, it is concluded that the pitting susceptibility and pit chemistry of Zr in physiological saline were unaffected by the presence of H2O2, albumin or their combinations.

Journal Keywords: Corrosion; X-ray diffraction; Zirconium

Subject Areas: Materials, Physics


Instruments: I18-Microfocus Spectroscopy

Documents:
C1003.full.pdf