中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 10 October 2015 |
（1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;
2. School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Northfield Ave, Wollongong, NSW 2522, Australia）
Abstract: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 Mg2Ca phases. During the corrosion process in the SBF, the Mg2Ca 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.
Key words: Mg-Ca alloy; corrosion behavior; corrosion product; cytotoxicity
