Effects of impurities on the biodegradation behavior of pure magnesium
Effects of impurities on the biodegradation behavior of pure magnesium
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DOI：
10.1007/s12540-009-0955-1
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发表时间：
2009-12-01
影响因子：
3.5
通讯作者：
Yang, Seok-Jo
中科院分区：
文献类型：
--
作者：
Lee, Ji-Young;Han, Gilsoo;Yang, Seok-Jo
研究不同杂质含量比（如Fe/Mn比）的纯镁在Hanks溶液中的腐蚀行为，以调整纯镁生物可降解植入物的使用寿命。观察到两个不同的腐蚀阶段：缓慢的腐蚀速率阶段和随后的快速腐蚀速率阶段。第一阶段是均匀腐蚀，在镁表面形成氢氧化镁和磷酸钙膜，腐蚀速率较慢。第二阶段的腐蚀速率急剧增加是由Fe析出物引起的，并受到Fe/Mn比增加的刺激。这种腐蚀发展为首选晶体点蚀，其中凹坑沿着首选晶体面扩展，而具有窄面间空间的几层Mg面仍未被腐蚀。通过本研究，期望通过控制杂质的数量和比例来定制纯Mg生物可降解植入物的寿命。
The corrosion behavior of pure magnesium that has different content ratio of impurities (such as Fe/Mn ratio) in Hanks' solution was investigated in order to tailor the lifetime of biodegradable implant made of pure magnesium. Two distinct stages of corrosion were observed: a slow corrosion rate stage and a subsequent fast corrosion rate stage. The first stage was characterized by uniform corrosion that produced magnesium hydroxide and calcium phosphate film on a magnesium surface, resulting in a slow corrosion rate. The second stage with an abrupt increase in the corrosion rate was induced by Fe precipitates and was stimulated by an increase in the Fe/Mn ratio. This corrosion was developed to a preferred crystallographic pitting corrosion where the pits propagated along the preferred crystallographic plane and several layers of Mg planes with narrow interplanar space remained uncorroded. From this study, it is expected that the lifetime of the biodegradable implant made of pure Mg can be tailored by controlling the amount and ratio of the impurities.