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In situ synchrotron x‐ray diffraction characterization of corrosion products of a ti‐based metallic glass for implant applications

DOI: 10.1002/adhm.201800338 DOI Help

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

Type: Journal Paper
Journal: Advanced Healthcare Materials , VOL 33

State: Published (Approved)
Published: September 2018
Diamond Proposal Number(s): 13963

Abstract: Ti‐based bulk metallic glasses are under consideration for implants due to their high yield strength and biocompatibility. In this work, in situ synchrotron X‐ray diffraction (XRD) is used to investigate the corrosion products formed from corrosion of Ti40Zr10Cu34Pd14Sn2 bulk metallic glass in artificial corrosion pits in physiological saline (NaCl). It is found that Pd nanoparticles form in the interior of the pits during electrochemical dissolution. At a low pit growth potential, the change in lattice parameter of the Pd nanoparticles is consistent with the formation of palladium hydride. In addition, a salt layer very close to the dissolving interface is found to contain CuCl, PdCl2, ZrOCl2∙8H2O, Cu, Cu2O, and several unidentified phases. The formation of Pd nanoparticles (16 ± 10 nm at 0.7 V vs Ag/AgCl) containing small amounts of the other alloying elements is confirmed by transmission electron microscopy. The addition of albumin and/or H2O2 does not significantly influence the nature of the corrosion products. When considering the biological compatibility of the alloy, the biological reactivity of the corrosion products identified should be explored.

Journal Keywords: artificial pits; bulk metallic glasses; corrosion; in situ synchrotron X-ray diffraction; metallic biomaterials

Diamond Keywords: Alloys

Subject Areas: Biology and Bio-materials, Materials, Chemistry

Instruments: I18-Microfocus Spectroscopy

Added On: 26/09/2018 09:08

Discipline Tags:

Physical Chemistry Corrosion Materials Science Biomaterials Metallurgy Chemistry

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