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Effect of hydroxyapatite (HA) coating on mechanical properties and biocorrosion behavior of Mg-3Zn-2Sr-1Cu alloy

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DOIResolve DOI: https://doi.org/10.1016/j.mtcomm.2025.114393
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0001-8899-860X; Search for: 1
Affiliation
  1. Iran University of Science and Technology
FormatText, Article
Subjecthydroxyapatite (HA) coating; sol-gel method; Mg-3Zn-2Sr-1Cu alloy; biodegradable implants; corrosion resistance; biomedical applications
Abstract
In this study, Mg-3Zn-2Sr-1Cu alloy was coated with hydroxyapatite (HA) using a sol-gel technique to evaluate the coating’s effects on microhardness and biodegradability. Heat treatment was performed at 300 °C, 350 °C, 400 °C, 450 °C, 500 °C to crystallize and enhance the adhesion of the HA coating. The microstructural analysis confirms that a continuous, crystalline, and phase-pure HA coating with interconnected needle-like morphologies and minimal visible substrate areas on the surface is formed at the heat treatment of 400 °C. The sol-gel-derived HA coating significantly enhanced the surface hardness, increasing from 88.7 ± 4.4 HV (base-alloy) to 181.8 ± 9.1 HV (HA-coated), and reduced the corrosion rate as observed during immersion tests in simulated body fluid (SBF). The corrosion rate decreased from 0.114 ± 0.006 for the base-alloy to 0.036 ± 0.002 for the HA-coated alloy, demonstrating a significant improvement in biodegradability. These enhancements are attributed to the formation of a uniform and adherent HA layer that mitigates rapid degradation while improving surface mechanical stability. This study highlights the potential of HA coatings in addressing the limitations of magnesium-based alloys, advancing their application in biodegradable implants.
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PublisherElsevier B.V.
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  • © 2025 The Author(s)
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  • Materials Today Communications 50, no. C, 114393 (24 November 2025): 1–12.
LanguageEnglish
Peer reviewedYes
NRC publication
This is a non-NRC publication

"Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.

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Record identifiere568920f-a80a-4c71-9cc4-8ed95552f382
Record created2026-02-17
Record modified2026-03-18

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