Influence of Sr and Mn Elements on the Microstructural Characteristics, Mechanical, and Anticorrosion Properties of Zn‐Based Biodegradable Materials

Abstract

This study specifically focuses on investigating the effects of Mn and Sr additions on the microstructure, mechanical properties, and anticorrosion behavior of as‐extruded Zn–Mn–Sr alloys, with the ultimate goal of developing biodegradable implants. The microstructural observations reveal that the incorporation of Mn and Sr elements plays a crucial role in refining the hcp (Zn) grains within the alloys. Moreover, the intermetallic phase SrZn13 is observed to precipitate along with the eutectic microstructure. Mechanical testing demonstrates that the addition of Sr shows the potential to enhance the mechanical properties of Zn–Mn alloys, and also results in a trade‐off with ductility. Notable alloys, BZA920, exhibit the highest values of yield strength at 219.8 ± 5.2 MPa and ultimate tensile strength at 240.6 ± 4.3 MPa; alloys of BZA315, BZA615, and BZA915 exhibit excellent ductility of over 40%. The electrochemical and immersion tests conducted in simulated body fluid (SBF) solution demonstrate the alloys’ favorable corrosion resistance. The corrosion rates range from 0.05 to 0.15 mm year−1, indicating their potential suitability as implant materials. Overall, this study highlights the exceptional mechanical properties, favorable corrosion resistance, and excellent biocompatibility of the investigated Zn–Mn–Sr alloys.