Zn元素对Mg-Sr镁合金显微组织、力学性能及腐蚀行为的影响

Effects of Zn on Microstructure, Mechanical Properties and Corrosion Behavior of Mg-Sr Alloy

摘要:

镁锶系列镁合金是最有前景的生物可降解金属材料之一。锶具有促进成骨和再生的作用，具有良好的生物相容性。但是镁锶合金具有强度不足、降解快速等缺点。添加适量的人体营养元素Zn在Mg-2Sr合金中，通过锌在镁合金中的固溶作用来细化晶粒以提高Mg-2Sr合金的强度和塑性。在模拟体液浸泡降解过程中，Mg-2Sr-2Zn合金生成的腐蚀保护层较致密，阻碍了浸泡过程中氯离子渗透，从而具有较好的耐蚀性。

Abstract:

Magnesium-strontium series alloys are one of the most prospective biodegradable metal materials, which perform well in biocompatibility because strontium has the function of promoting osteogenesis and regeneration. But the shortcomings of magnesium alloys such as inadequate strength and rapid degradation rate still exist. In the present study, an appropriate amount of human nutrient element zinc was added into Mg-2Sr alloy. Since the solid solution effect of zinc in the alloy can refine the grains, the strength and plasticity of Mg-2Sr alloy are improved. Results show that the Mg-2Sr-2Zn alloy has better corrosion resistance during the degradation processing. The corrosion protection layer is relatively dense, which hinders the penetration of chlorine ions in the simulated body fluid during the soaking process.