Impact of copper addition and calcium phosphate coating on Mg alloys for biomedical applications
Magnesium (Mg) alloys are widely explored in biomedical engineering due to their biodegradability, biocompatibility, and mechanical properties similar to human bone. This study investigates the mechanical properties and corrosion resistance of as-cast Magnesium-Copper (Mg-Cu) alloys and their calciu...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S259012302501062X |
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| Summary: | Magnesium (Mg) alloys are widely explored in biomedical engineering due to their biodegradability, biocompatibility, and mechanical properties similar to human bone. This study investigates the mechanical properties and corrosion resistance of as-cast Magnesium-Copper (Mg-Cu) alloys and their calcium phosphate (CaP)-coated counterparts for potential use in biodegradable implants. Mg-1.5 wt. % Cu alloys were fabricated via vacuum casting, and CaP coatings were applied using an ultrasound-assisted dip-coating method. Corrosion behavior was assessed through weight loss measurements in Simulated Body Fluid (SBF) and electrochemical characterization, while compressive strength tests evaluated mechanical properties. The results showed that while copper addition improved mechanical strength, it also significantly increased the corrosion rate, with uncoated samples exhibiting a corrosion rate of 848.4 mm/year. The application of calcium phosphate coatings led to a reduction in corrosion rates to 840.2 mm/year, 744.7 mm/year, and 802.1 mm/year for different coating compositions. Although calcium phosphate coatings reduced the corrosion rate, they did not meet the required threshold for biomedical applications. Additionally, while the coated samples exhibited improved ductility, their compressive strength decreased from 91.41 MPa (uncoated) to 76.9 MPa, 66.58 MPa, and 50.94 MPa for different coating compositions. These findings emphasize the need for further surface modifications or alloying strategies to enhance the corrosion resistance of Mg-Cu alloys while maintaining mechanical integrity for biomedical applications. Future research should focus on enhancing corrosion resistance, along with long-term in-vitro and in-vivo evaluations to assess biodegradation behavior, biocompatibility, and mechanical stability under physiological conditions. |
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| ISSN: | 2590-1230 |