The role of β1 precipitates in the bio-corrosion performance of Mg–3Zn in simulated body fluid

Y. Lu; Andrew Bradshaw; Yu-Lung Chiu; I.p. Jones

doi:10.1016/j.jallcom.2014.06.078

The role of β₁ precipitates in the bio-corrosion performance of Mg–3Zn in simulated body fluid

Y. Lu, Andrew Bradshaw, Yu-Lung Chiu, I.p. Jones

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Abstract

Mg–Zn alloys are promising candidate materials for medical applications. The bio-corrosion performance of Mg–3 wt% Zn has been studied at 37 °C in simulated body fluid (SBF) using immersion tests and electrochemical measurements. Heat treatments (solution treatment and ageing) were used to alter the microstructure and adjust the volume fraction of precipitates. It has been found that, in the solution treated sample, the dissolution of (α-Mg + MgZn) eutectic phases led to a low corrosion rate (3.05 ± 0.20 mL/cm2/day). The volume fraction of precipitates increases with ageing time at 160 °C and causes the corrosion performance to deteriorate because of micro-cathodic effects. Thus the aged sample with the largest volume fraction of precipitates exhibits the worst corrosion resistance (4.65 ± 0.01 mL/cm2/day).

Original language	English
Pages (from-to)	345-352
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	614
Early online date	21 Jun 2014
DOIs	https://doi.org/10.1016/j.jallcom.2014.06.078
Publication status	Published - 25 Nov 2014

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10.1016/j.jallcom.2014.06.078

Lu_Bio_corrosion_performance_Mg_3Zn_Journal_Alloys_Compounds_2014
NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Alloys and Compounds. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Alloys and Compounds [VOL 614, 25 November 2014] DOI: 10.1016/j.jallcom.2014.06.078 Eligibility for repository checked October 2014
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title = "The role of β1 precipitates in the bio-corrosion performance of Mg–3Zn in simulated body fluid",

abstract = "Mg–Zn alloys are promising candidate materials for medical applications. The bio-corrosion performance of Mg–3 wt% Zn has been studied at 37 °C in simulated body fluid (SBF) using immersion tests and electrochemical measurements. Heat treatments (solution treatment and ageing) were used to alter the microstructure and adjust the volume fraction of precipitates. It has been found that, in the solution treated sample, the dissolution of (α-Mg + MgZn) eutectic phases led to a low corrosion rate (3.05 ± 0.20 mL/cm2/day). The volume fraction of precipitates increases with ageing time at 160 °C and causes the corrosion performance to deteriorate because of micro-cathodic effects. Thus the aged sample with the largest volume fraction of precipitates exhibits the worst corrosion resistance (4.65 ± 0.01 mL/cm2/day).",

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AU - Lu, Y.

AU - Bradshaw, Andrew

AU - Chiu, Yu-Lung

AU - Jones, I.p.

PY - 2014/11/25

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N2 - Mg–Zn alloys are promising candidate materials for medical applications. The bio-corrosion performance of Mg–3 wt% Zn has been studied at 37 °C in simulated body fluid (SBF) using immersion tests and electrochemical measurements. Heat treatments (solution treatment and ageing) were used to alter the microstructure and adjust the volume fraction of precipitates. It has been found that, in the solution treated sample, the dissolution of (α-Mg + MgZn) eutectic phases led to a low corrosion rate (3.05 ± 0.20 mL/cm2/day). The volume fraction of precipitates increases with ageing time at 160 °C and causes the corrosion performance to deteriorate because of micro-cathodic effects. Thus the aged sample with the largest volume fraction of precipitates exhibits the worst corrosion resistance (4.65 ± 0.01 mL/cm2/day).

AB - Mg–Zn alloys are promising candidate materials for medical applications. The bio-corrosion performance of Mg–3 wt% Zn has been studied at 37 °C in simulated body fluid (SBF) using immersion tests and electrochemical measurements. Heat treatments (solution treatment and ageing) were used to alter the microstructure and adjust the volume fraction of precipitates. It has been found that, in the solution treated sample, the dissolution of (α-Mg + MgZn) eutectic phases led to a low corrosion rate (3.05 ± 0.20 mL/cm2/day). The volume fraction of precipitates increases with ageing time at 160 °C and causes the corrosion performance to deteriorate because of micro-cathodic effects. Thus the aged sample with the largest volume fraction of precipitates exhibits the worst corrosion resistance (4.65 ± 0.01 mL/cm2/day).

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The role of β1 precipitates in the bio-corrosion performance of Mg–3Zn in simulated body fluid

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The role of β₁ precipitates in the bio-corrosion performance of Mg–3Zn in simulated body fluid