In vitro corrosion behaviour of Mg alloys in a phosphate buffered solution for bone implant application
In vitro corrosion behaviour of Mg alloys in a phosphate buffered solution for bone implant application
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DOI：
10.1007/s10856-007-3219-y
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
Liping Xu;E. Zhang;D. Yin;Song-yan Zeng;Ke Yang
中科院分区：
文献类型：
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作者：
Liping Xu;E. Zhang;D. Yin;Song-yan Zeng;Ke Yang
通过电化学测试和骨植入应用的失重实验，研究了 Mg-Mn 和 Mg-Mn-Zn 镁合金在磷酸盐缓冲模拟体液 (SBF) 中的腐蚀行为。极化曲线中较长的钝化阶段和较高的击穿电位表明，在磷酸盐缓冲SBF中，镁合金表面可以快速形成钝化层，从而保护镁免受快速腐蚀。通过 SEM、EDS、SAXS 和 XPS 对浸入式镁合金的表面进行了表征。结果表明，浸泡 24 小时后，Mg-Mn 和 Mg-Mn-Zn 合金完全被非晶态含镁磷酸盐反应层覆盖。镁合金的腐蚀行为可以通过镁与溶液反应而溶解镁并在镁表面析出含镁磷酸盐来描述。失重率和增重率结果表明，镁合金在前48小时腐蚀严重，同时含镁磷酸盐在镁合金表面快速沉淀。浸泡48-96 h后，腐蚀反应和沉淀反应达到稳定阶段，表明镁表面的磷酸盐层，特别是含Zn的磷酸盐层可以为镁合金提供有效的保护。
The corrosion behaviour of Mg–Mn and Mg–Mn–Zn magnesium alloy in a phosphate buffered simulated body fluid (SBF) has been investigated by electrochemical testing and weight loss experiment for bone implant application. Long passivation stage and noble breakdown potential in the polarization curves indicated that a passive layer could be rapidly formed on the surface of magnesium alloy in the phosphate buffered SBF, which in turn can protect magnesium from fast corrosion. Surfaces of the immersed magnesium alloy were characterized by SEM, EDS, SAXS and XPS. Results have shown that Mg–Mn and Mg–Mn–Zn alloy were covered completely by an amorphous Mg-containing phosphate reaction layer after 24 h immersion. The corrosion behaviour of magnesium alloys can be described by the dissolving of magnesium through the reaction between magnesium and solution and the precipitating of Mg-containing phosphate on the magnesium surface. Weight loss rate and weight gain rate results have indicated that magnesium alloys were corroded seriously at the first 48 h while Mg-containing phosphate precipitated fast on the surface of magnesium alloy. After 48–96 h immersion, the corrosion reaction and the precipitation reaction reach a stable stage, displaying that the phosphate layer on magnesium surface, especially Zn-containing phosphate layer could provide effective protection for magnesium alloy.