생체 분해성 임플란트용 Mg-Zn-Ca합금의 기계적 및 부식특성에 미치는 Sr 첨가의 영향 = Effect of Sr Addition on Mechanical and Corrosion Properties of Mg-Zn-Ca Alloy for Biodegradable Implant Material

다국어 초록 (Multilingual Abstract)

The effect of Sr addition on mechanical and bio-corrosion properties of as-cast Mg-3wt.%Zn-0.5wt.%Ca-xwt.%Sr (x = 0.3, 0.6, 0.9) alloys were examined for application as biodegradable implant material. The microstructure, mechanical properties and corrosion resistance of the as-cast Mg-Zn-Ca-Sr alloys were characterized by using optical microscopy, scanning electron microscopy, tensile testing and electrochemical measurement in Hank``s solution. The as-cast alloys contained α-Mg and eutectic Ca2Mg6Zn3 phases, while the alloys contained α-Mg, Ca2Mg6Zn3 and Mg-Zn-Ca-Sr intermetallic compound when the Sr addition was more than 0.3 wt.%. The yield strength, ultimate tensile strength and elongation increased with the increasing of Sr content up to 0.6 wt.% but decreased in the 0.9 wt.% Sr-added alloy, whereas the corrosion resistance of 0.3 wt.% Sr-added alloy was superior to other alloys. It was thought that profuse Mg-Zn-Ca-Sr intermetallic compound deteriorated both the mechanical properties and corrosion resistance of the as-cast alloy.