Microstructure and in vitro degradation performance of Mg-Zn-Mn alloys for biomedical application.

摘要: Manganese and zinc were selected as alloying ele- ments to develop a Mg-based ternary alloy for biomedical applications, taking into account the good biocompatibility of these metals. The microstructures Mg-Zn-Mn alloys con- taining 0.5 or 1.0 mass% manganese 1.5 investigated by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. Their corrosion properties assessed means potentiody- namic polarization electrochemical impedance spectros- copy measurements performed in Ringer's physiological solution that simulates bodily fluids. All tested samples are two-phase formed matrix, consisting solid solution, Mg-Zn binary phase. results show an improvement corro- sion behavior increasing Zn Mn content. This is attributed formation par- tially protective Mg(OH)2 surface film whose capa- bilities increased elements. reduced influence intermetallic compound on rate presence partially layer can be ascribed re- sistance between sec- ond phase, thereby decreasing effective driving force microgalvanic corrosion. Owing its highest ability, Mg-1.5Zn-1Mn promising candidate development degradable implants, such screws, plates, rods