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医用镁合金的降解特性直接影响其在心血管支架和骨替换材料等领域的应用。本研究在保持与生理体液氯离子浓度一致的基础上,选用镁合金AZ31B分别浸入NaCl溶液,KCl溶液,MgCl2溶液和CaCl2溶液中,对比研究金属阳离子对医用镁合金的降解行为影响。通过动电位极化曲线和电化学阻抗谱测试分析,发现镁合金浸泡在4种氯盐溶液时的腐蚀电位、阻抗与其在降解过程中溶液pH变化、样品失重变化趋势一致,即金属阳离子直接影响医用镁合金的降解特性:NaCl>KCl>CaCl2>MgCl2,其中Na+和K+比Ca2+和Mg2+更能促进镁合金降解。
The degradation characteristics of medical magnesium alloy directly affect its application in the fields of cardiovascular stents and bone replacement materials. In this study, magnesium chloride AZ31B was immersed in NaCl solution, KCl solution, MgCl2 solution and CaCl2 solution, respectively, on the basis of keeping the same with the physiological chloride ion concentration. The effects of metal cations on the degradation of medical magnesium alloy were compared. The results of potentiodynamic polarization curves and electrochemical impedance spectroscopy show that the corrosion potential and impedance of magnesium alloy immersed in four kinds of chloride salts solution are consistent with the changes of solution pH and the weight loss of the samples during the degradation process, Degradation characteristics of medical magnesium alloy: NaCl> KCl> CaCl2> MgCl2, in which Na + and K + can promote the degradation of magnesium alloy more than Ca2 + and Mg2 +.