摘要
The corrosion degradation behavior of a Mg-Ca alloy with high Ca content aiming for a potential bone repair material in the simulated body fluid（SBF） was investigated.The microstructure and phase constitution of the pristine Mg-30%Ca（mass fraction） alloy were characterized with scanning electron microscopy（SEM） and X-ray diffraction（XRD）.The Mg-30%Ca alloy samples were immersed in the SBF for 90 d,and the morphology,composition and cytotoxicity of the final corrosion product were examined.It is found that Mg-30%Ca alloy is composed of α-Mg and Mg2 Ca phases.During the corrosion process in the SBF,the Mg2 Ca phase acts as an anode and the α-Mg phase acts as a cathode.The final corrosion product of the Mg-30%Ca alloy in SBF includes a small amount of black precipitates and white suspended particles.The white suspended particles are Mg（OH）2 and the black particles are believed to have a core-shell structure.The cytotoxicity experiments indicate that these black precipitates do not induce toxicity to cells.
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。
基金
Project(51271131)supported by the National Natural Science Foundation of China
