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研究高Ca含量Mg-Ca合金作为骨修复材料在模拟体液中的腐蚀降解行为。采用扫描电子显微镜(SEM)和X射线衍射(XRD)对Mg-30%Ca(质量分数)合金的显微组织及相成分进行表征。将Mg-30%Ca合金在模拟体液中浸泡90 d后,观察和测试最终产物的微观形貌、成分以及细胞毒性。结果表明:Mg-30%Ca合金的主要相成分为α-Mg和Mg2Ca相,在浸泡过程中,Mg2Ca相作为阳极,而α-Mg相作为阴极;Mg-30%Ca合金在模拟体液中浸泡的最终腐蚀产物由少量的的黑色沉淀颗粒和白色悬浮颗粒组成,白色悬浮颗粒为Mg(OH)2,而黑色沉淀颗粒具有核壳结构;细胞毒性实验证明黑色沉淀颗粒无细胞毒性。
To study the corrosion behavior of Mg-Ca alloy with high Ca content as a bone repair material in simulated body fluids. The microstructure and phase composition of Mg-30% Ca (mass fraction) alloy were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) After immersing Mg-30% Ca alloy in simulated body fluid for 90 d, the microstructure, composition and cytotoxicity of the final product were observed and tested. The results show that the main phase components of Mg-30% Ca alloy are α-Mg and Mg2Ca phases. In the soaking process, Mg2Ca phase acts as anode and α-Mg phase serves as cathode. Mg-30% Ca alloy is immersed in simulated body fluid The final corrosion product consists of a small amount of black precipitated particles and white suspended particles. The white suspended particles are Mg (OH) 2, while the black precipitated particles have a core-shell structure. Cytotoxicity experiments show that the black precipitated particles are non-cytotoxic.