Influence of artificial biological fluid composition on the biocorrosion of potential orthopedic Mg-Ca, AZ31, AZ91 alloys
Influence of artificial biological fluid composition on the biocorrosion of potential orthopedic Mg-Ca, AZ31, AZ91 alloys
复制标题
人工生物液成分对潜在骨科Mg-Ca、AZ31、AZ91合金生物腐蚀的影响
DOI：
10.1088/1748-6041/4/6/065011
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发表时间：
2009-12-01
影响因子：
4
通讯作者：
Chen, L. J.
中科院分区：
文献类型：
--
作者：
Gu, X. N.;Zheng, Y. F.;Chen, L. J.
在Hank‘s液、Dulbecco’s改良Eagle‘s培养液(DMEM)和含血清介质(DMEM+10%胎牛血清(DMEM+FBS))中，研究了矫形外科电位镁钙、AZ31和AZ91合金在7d浸泡时间内的电化学行为。采用线性极化和交流阻抗法研究了三种合金在不同浸泡时间下的生物腐蚀行为。浸泡7d后，进行动电位极化测试，并用扫描电子显微镜(SEM)观察和能谱仪(EDS)分析相结合的方法对实验样品的表面形貌进行观察。结果表明，溶液成分对镁合金的腐蚀有一定的影响。结果表明，氯离子会降低涂层的耐蚀性，而碳氢化合物离子会导致表面快速钝化。吸附在镁合金表面的氨基酸增加了镁合金的极化电阻，降低了电流密度。血清蛋白对腐蚀的影响与镁合金成分有关。在有血清蛋白存在的情况下，镁钙合金的腐蚀速度加快。AZ31合金在DMEM+FBS溶液中浸泡3d后，腐蚀速率增加，此后腐蚀速率下降。高Al含量的AZ91合金在DMEM中加入FBS后，腐蚀速率降低。
The electrochemical behavior of potential orthopedic Mg-Ca, AZ31 and AZ91 alloys was studied in Hank's solution, Dulbecco's Modified Eagle's Medium (DMEM) and serum-containing medium (DMEM adding 10% fetal bovine serum (DMEM+FBS)) over a 7 day immersion period. The biocorrosion of the above three alloys for various immersion time intervals was investigated by linear polarization and electrochemical impedance spectroscopy (EIS). After 7 day immersion, potentiodynamic polarization tests were carried out and the surface morphologies of experimental samples were examined by scanning electron microscopy (SEM) observation complemented by energy-disperse spectrometer (EDS) analysis. It was shown that the corrosion of magnesium alloys was influenced by the composition of the solution. The results indicated that chloride ion could reduce the corrosion resistance and the hydrocarbonate ions could induce rapid surface passivation. The adsorbed amino acid on the experimental magnesium alloys' surface increased their polarization resistance and reduced current densities. The influence of the serum protein on corrosion was found to be associated with the magnesium alloy compositions. A Mg-Ca alloy exhibited an increased corrosion rate in the presence of serum protein. An AZ31 alloy showed an increased corrosion rate in DMEM+FBS in the initial 3 day immersion and the corrosion rate decreased thereafter. An AZ91 alloy, with high Al content, showed a reduced corrosion rate with the addition of FBS into DMEM.