Study on Glass Forming Ability and Corrosion Performance of Ca Based Biomedical Materials

Purpose Solving the two major dilemmas of stress shielding and secondary surgery faced by permanent biomedical metal implants. Methods We discuss a study on Ca53+xMg20Zn27-x (x=0,2,4,6,8,10) alloys, focusing on changes in Zn content near eutectic points and their impact on microstructure and biological corrosion behavior. A copper mold spray casting method has been developed to prepare amorphous bar alloys and amorphous crystalline composite bar alloys with a diameter of 3 mm, which has been verified by electrochemical treatment and other tests. Results The Ca63Mg20Zn17 alloy showed the best glass-forming ability, while the Ca59Mg20Zn21 alloy exhibited superior corrosion resistance. Additionally, the study suggests that the corrosion resistance of Ca-based amorphous crystalline composite alloys increases when the Zn content decreases. Conclusions At constant Mg, the GFA of Ca53+xMg20Zn27-x (x=6, 8, and 10) increased with the decrease of Zn content, indicating an increase in Ca content. In simulated body fluid (SBF) at 37 ℃, the corrosion resistance of Ca53+xMg20Zn27-x (x=0, 2, and 4) composite alloy bars increase with the decrease of Zn content, while the corrosion resistance of Ca53+xMg20Zn27-x (x=6, 8, and 10) BMGs bars decrease with the decrease of Zn content. The corrosion performance of Ca57Mg20Zn23 composite bar is better than that of the completely amorphous Ca59Mg20Zn21 amorphous bar, because a small amount of crystal phase in the amorphous bar acts as anode, protecting the amorphous matrix and improving the corrosion resistance of the system. The cytotoxicity test shows that Ca-Mg-Zn alloy has good biocompatibility and can be utilized as a biomedical material.