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Unveiling the effect of grain size on biodegradation of magnesium
File(s)
Author(s)
Medeiros, Mariana P
Lopes, Debora R
Carvalho, Amanda P
Hohenwarter, Anton
Kawasaki, Megumi
Type
Journal Article
Abstract
It is known that the grain size plays a major role in the mechanical properties of magnesium. The aim of the present study is to evaluate its role in long-term corrosion rate. Samples of pure magnesium with grain sizes in the range of 0.9–82 μm are produced through severe plastic deformation and annealing treatments. The mechanical properties are evaluated using tensile tests and the corrosion behavior is evaluated using immersion tests in Hank's solution. A maximum yield stress of ≈150 MPa is observed in the sample with 1.8 μm of grain size and an elongation larger than 25% is observed in the ultrafine-grained sample. Ultrafine- and fine-grained magnesium display uniform corrosion with a decreasing corrosion rate while coarse-grained magnesium displays localized corrosion with an accelerated corrosion rate. A corrosion rate of ≈0.2 mm year−1 is observed in the ultrafine- and fine-grained magnesium. The corrosion product layer of the fine-grained magnesium contains elements absorbed from the media. An analysis of the data in the literature suggests that grain refinement changes the corrosion type from localized to uniform corrosion. The exact relationship between grain size and the corrosion rate remains elusive.
Date Issued
2024-11
Date Acceptance
2024-09-10
Citation
Advanced Engineering Materials, 2024, 26 (22)
URI
URL
DOI
ISSN
1438-1656
Publisher
Wiley
Journal / Book Title
Advanced Engineering Materials
Volume
26
Issue
22
Copyright Statement
Copyright © 2024 Wiley-VCH GmbH
. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Identifier
http://dx.doi.org/10.1002/adem.202401605
Publication Status
Published
Article Number
2401605
Date Publish Online
2024-10-04