Corrosion Behavior of Mg-xGd-1Zn-0.4Zr Alloys with Different Gd Additions for Biomedical Application

In recent years, Mg alloys have attracted increased attention for biomedical application owing to their good biodegradability, biocompatibility, and biomechanical properties. However, rapid corrosion is still one of the most common limitations implanted application. this work, microstructure behavior solution- aging-treated Mg-xGd-1Zn-0.4Zr (x = 3, 6, 9 wt%, denoted as GZ31K, GZ61K, GZ91K, respectively) were studied using optical microscope (OM), scanning electron (SEM), immersion tests, electrochemical quasi in situ method. The results show that block Gd-rich precipitates needle-like Zr-Zn-rich are formed well ?-Mg matrix. With increase Gd content, grain size first reduces then increases. Corrosion experiment GZ61K alloy has best resistance GZ91K shows highest rate among three simulated body fluid (SBF). It found preferentially corroded better compared with 0.23 mm/y SBF a promising prospect