Processing and in vitro corrosion analysis of sustainable and economical eggshell reinforced Mg and Mg-Zr matrix composite for biomedical applications. (August 2022)

• Record Type: Journal Article
• Authors: Hussein, M.A.; Azeem, M.A.; Kumar, A. Madhan; Emara, Noha M.
• Is Part Of: Materials today communications. Volume 32(2022)
• Publication Date: 2022-08
• Subjects: Mg -- Magnesium metal matrix composite -- Biomedical -- Corrosion -- Eggshell; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.103944
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Although magnesium and magnesium alloys have low elasticity and biodegradable capabilities, the rapid rate of degradation of pure Mg in the body affects the mechanical and corrosion properties. In the current work, the Mg and Mg-1Zr matrix composite reinforced with Eggshell (ES) were synthesized using powder metallurgy. The elemental powders were blended using a milling machine, then compacted at 550 MPa and sintered in an inert atmosphere at 450° C for 2 hr. The synthesized composites were characterized in terms of structure, microstructure, densification, and microhardness. In vitro corrosion, performance was studied in Hank's medium. The results showed that the sintered samples of Mg-1Zr, Mg-2.5ES, and Mg-1Zr-2.5ES had a relatively homogeneous distribution of reinforcement, with densifications of 99.65%, 98.9%, and 99.2%, respectively. The sintered Mg-1Zr and Mg-1Zr-2.5ES samples showed enhanced microhardness by 13% and 6% respectively compared to pure Mg. The biocorrosion study revealed the beneficial role of reinforcing Mg with Zr and ES particles and their synergetic effect by showing the higher polarization resistance and lower corrosion rate values in Hank's medium. The finding demonstrates the potential of ES to be used as effective green reinforcement particles in the synthesis of Mg and Mg-Zr-based composite with improved in vitro corrosion properties for biomedical applications. Graphical Abstract: ga1 Highlights: Mg and Mg-Zr /Eggshell composites were processed using powder metallurgy. The microhardness and in vitro corrosion properties of the composites were studied in Hank's solution. The in vitro corrosion performance of the composite was improved by the addition of Zr and Eggshell. Eggshell has the potential to be used as a green reinforcement in the synthesis of based MMC for biomedical applications.