Polarization Behavior of Pure Magnesium under a Controlled Flow in a NaCl Solution
Polarization Behavior of Pure Magnesium under a Controlled Flow in a NaCl Solution
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DOI：
10.2320/matertrans.mra2008011
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发表时间：
2008-06
影响因子：
1.2
通讯作者：
S. Hiromoto;A. Yamamoto;N. Maruyama;H. Somekawa;T. Mukai
中科院分区：
文献类型：
--
作者：
S. Hiromoto;A. Yamamoto;N. Maruyama;H. Somekawa;T. Mukai
镁及其合金是生物可吸收支架的潜在候选材料。留置镁支架的降解率有望在血液流动的情况下得到控制。用旋转电极研究了控制流动对纯镁在0.6质量%的氯化钠溶液中极化和阻抗行为的影响。电流的存在使浸泡几小时的阳极电流密度增加，阻抗降低，表明镁的溶解加速，表面氢氧化膜的生长受阻。有趣的是，流动的存在延缓了表面膜的破裂。表面膜被击穿后，阻抗不依赖于转速。为了准确评估支架用镁及其合金的降解率，应控制试验溶液的流速。[DOI：10.2320/MATERTRA.MRA2008011]
Magnesium and its alloys are potential candidates for bioabsorbable stents. The degradation rate of an indwelled magnesium stent is expected to be controlled under a blood flow. The influence of the controlled flow on the polarization and impedance behavior of pure Mg was thus investigated in a 0.6 mass% NaCl solution using a rotating electrode. The existence of a flow caused an increase in the anodic current density as well as a decrease in the impedance for a few hours of immersion, indicating the acceleration of Mg dissolution and the retardation of the growth of the surface hydroxide film. Interestingly, the existence of a flow retarded the breakdown of the surface film. After the surface film was broken down, the impedance did not depend on the rotation speed. To precisely evaluate the degradation rate of magnesium and its alloys for use in stents, the flow rate of the test solution should be controlled. [doi:10.2320/matertrans.MRA2008011]