Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys

Yu Lu; Andrew Bradshaw; Y.l. Chiu; I.p. Jones

doi:10.1016/j.msec.2014.12.049

Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys

Yu Lu, Andrew Bradshaw, Y.l. Chiu, I.p. Jones

Metallurgy and Materials

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Abstract

The bio-corrosion behaviour of Mg–3Zn–0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 °C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to micro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly.

Original language	English
Pages (from-to)	480-486
Journal	Materials Science and Engineering C
Volume	48
Early online date	13 Dec 2014
DOIs	https://doi.org/10.1016/j.msec.2014.12.049
Publication status	Published - 1 Mar 2015

Keywords

Mg–Zn–Ca
Degradation
Microstructure
Heat treatment

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10.1016/j.msec.2014.12.049

Lu_et_al_Effects_secondary_phase_Materials_Science_Engineering_C_2014
NOTICE: this is the author’s version of a work that was accepted for publication. 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 as Y. Lu, A.R. Bradshaw, Y.L. Chiu, I.P. Jones, Effects of secondary phase and grain size on the corrosion of biodegradable Mg-Zn-Ca alloys, Materials Science & Engineering C (2014), doi: 10.1016/j.msec.2014.12.049
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Cite this

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title = "Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys",

abstract = "The bio-corrosion behaviour of Mg–3Zn–0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 °C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to micro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly.",

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T1 - Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys

AU - Lu, Yu

AU - Bradshaw, Andrew

AU - Chiu, Y.l.

AU - Jones, I.p.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - The bio-corrosion behaviour of Mg–3Zn–0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 °C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to micro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly.

AB - The bio-corrosion behaviour of Mg–3Zn–0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 °C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to micro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly.

KW - Mg–Zn–Ca

KW - Degradation

KW - Microstructure

KW - Heat treatment

U2 - 10.1016/j.msec.2014.12.049

DO - 10.1016/j.msec.2014.12.049

M3 - Article

SN - 0928-4931

VL - 48

SP - 480

EP - 486

JO - Materials Science and Engineering C

JF - Materials Science and Engineering C

ER -

Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys

Abstract

Keywords

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