Combinatorial screening of dysprosium-magnesium-zinc alloys for bioresorptive implants

•Small Dy additions (< 0.5 at.%) lead to thin film amorphization in Mg-Zn alloys.•Higher Dy additions (> 0.5 at.%) lead to enhanced surface morphology features.•Dy-Mg-Zn alloys show superior corrosion resistance up to 20 at.% Zn.•Estimated corrosion rates of 3 mm y−1 and lower could be reached...

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Bibliographic Details
Published in:Electrochimica acta 2020-12, Vol.363, p.137106, Article 137106
Main Authors: Recktenwald, Dominik, Mardare, Cezarina Cela, Mardare, Andrei Ionut, Jinga, Luiza-Izabela, Socol, Gabriel, Hassel, Achim Walter
Format: Article
Language:English
Subjects:
Biocompatibility
Biomedical materials
Combinatorial analysis
Combinatorial library
Corrosion resistance
Corrosion resistant alloys
Dysprosium base alloys
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrode polarization
Gas evolution
Libraries
Magnesium
Magnesium alloy
Morphology
Open circuit voltage
Rare earth metals
Scanning droplet cell microscopy
Surgical implants
Thin films
X ray photoelectron spectroscopy
Zinc alloy
Zinc base alloys
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Summary:•Small Dy additions (< 0.5 at.%) lead to thin film amorphization in Mg-Zn alloys.•Higher Dy additions (> 0.5 at.%) lead to enhanced surface morphology features.•Dy-Mg-Zn alloys show superior corrosion resistance up to 20 at.% Zn.•Estimated corrosion rates of 3 mm y−1 and lower could be reached.•Zn dissolution is strongly decreased due to passive corrosion product formation. A thin film dysprosium-magnesium-zinc combinatorial library has been deposited using a thermal co-evaporation technique. Scanning EDX, XRD, SEM and XPS were used to investigate the structure, surface morphology and species present. The entire library was found to be amorphous and morphological changes were visible by minor additions of Dy (approximately 1 at.%) and medium to high Zn contents (> 20 at.%). Open circuit potential, electrochemical impedance spectroscopy and potentiodynamic polarization measurements revealed a higher corrosion resistance for Zn-poor alloys (
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2020.137106