Corrosion Behavior of As-cast Mg-Zn-Y-Zr-Ca Alloy in Simulated Body Fluid
SUN Yi1,2, ZHANG Wenxin1,2, XU Chunxiang1,2, ZHANG Jinshan1,2, HAN Shaobing1,2, JIA Changjian1,2
1 School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024; 2 Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan 030024
Abstract: The microstructure of the as-cast Mg-3Zn-0.6Y-0.5Zr-0.3Ca alloy was observed by optical and scanning electron microscopy. The biocorrosion properties of the alloy in simulated body fluid (SBF) were evaluated using mass loss experiments with different immersion time. The results based on the microstructure and the corrosion morphology observation and analysis show that the quasi-continuous network of I-phase (Mg3YZn6) at grain boundaries has a dual effect on the corrosion behavior of the alloy. As a cathode to accelerate corrosion or a barrier can restrain the further expansion of corrosion. The corrosion process can be divided into three stages, corresponding to corrosion features with different times. At the initial stage, the solute depleted zones formed corrosion grooves about several microns in width; at the middle stage, the regions with high concentration of Zr formed many corrosion pits in the α-Mg matrix; at the final stage, the corrosion grooves and corrosion pits extended toward the α-Mg matrix.
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2017, Vol. 31 
