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Journal of Materials Science
Published in: Journal of Materials Science 8/2020

09-12-2019 | Materials for life sciences

In-vitro corrosion assessment of silicate-coated AZ31 Mg alloy in Earle’s solution

Authors: M. Kalaiyarasan, K. Saranya, N. Rajendran

Published in: Journal of Materials Science | Issue 8/2020

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Abstract

Magnesium alloys are promising materials for biodegradable implants. In the present investigation, AZ31 Mg alloy was anodized in alkaline silicate electrolyte and anodization time period was optimized. From the current transient (i–t) curve and corrosion analysis, it was confirmed that 60-min anodization was sufficient to obtain a silicate coating with a better corrosion resistance of 37.05 kΩ. The hydrophilic nature of the coating was confirmed by the contact angle measurement. XRD results revealed the formation of MgO (periclase) and biocompatible Mg2SiO4 (forsterite) phases. Hydrogen evolution studies showed that the degradation rate of the anodized sample correlated with the real-time corrosion behavior. At the end of 7 days of immersion in Earle’s solution, bone-like apatite was precipitated with Ca/P ratio at 1.39 indicating the incorporation of silica in the apatite. From scanning electrochemical microscopic studies, the current density of anodized sample was found to be minimum and uniform over the entire surface. Increase in immersion time resulted in fluctuation in current density signifying the coating’s interaction with Earle’s solution and initiation of apatite formation.
previous article Synthesis of Sn2Nb2O7-GO nanocomposite as an anode material with enhanced lithium storage performance
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Metadata
Title
In-vitro corrosion assessment of silicate-coated AZ31 Mg alloy in Earle’s solution
Authors
M. Kalaiyarasan
K. Saranya
N. Rajendran
Publication date
09-12-2019
Publisher
Springer US
Published in
Journal of Materials Science / Issue 8/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-019-04039-w

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