Corrosion inhibition of powder metallurgy Mg by fluoride treatments
Corrosion inhibition of powder metallurgy Mg by fluoride treatments
复制标题
DOI：
10.1016/j.actbio.2009.11.004
复制
发表时间：
2010-05-01
影响因子：
9.7
通讯作者：
Fernandez Lorenzo de Mele, M. A.
中科院分区：
文献类型：
--
作者：
Pereda, M. D.;Alonso, C.;Fernandez Lorenzo de Mele, M. A.
纯镁已被提议作为一种潜在的可降解生物材料，以避免不可降解内固定植入物的缺点和使用可能有毒的合金元素。然而，它表现出过高的腐蚀速率和不足的屈服强度。为了提高镁的机械性能和耐腐蚀性，分析了粉末冶金 (PM) 途径增强镁的效果以及生物相容性腐蚀抑制剂的应用（分别浸泡在 0.1 和 1 M KF 溶液处理、0.1 M FST 和 1 M FST 中）。通过开路电位测量、极化技术（PT）、扫描电化学显微镜（SECM）和电化学阻抗谱（EIS）来评估其腐蚀行为。 SECM表明，在F-处理期间，受攻击区域的局部电流下降。通过PT和EIS评估了0.1 M FST和1 M FST在磷酸盐缓冲溶液中的缓蚀作用。在所测定的实验条件下，0.1 M FST 显示出更好的性能。使用 0.1 M FST 对 Mg(PM) 进行的 X 射线光电子能谱、能量色散 X 射线和 X 射线衍射分析表明，表面存在 KMgF3 晶体，而 1 M FST 则检测到 MgF2 薄膜。经过氟化物抑制处理后，Mg(PM)作为可降解金属生物材料得到了有希望的结果，因为它比未经处理的镁具有更高的屈服强度和更低的初始腐蚀速率，并且含氟薄膜的保护特性逐渐丧失，从而确保了逐渐降解过程。 (C) 2009 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Pure Mg has been proposed as a potential degradable biomaterial to avoid both the disadvantages of non-degradable internal fixation implants and the use of alloying elements that may be toxic. However, it shows excessively high corrosion rate and insufficient yield strength. The effects of reinforcing Mg by a powder metallurgy (PM) route and the application of biocompatible corrosion inhibitors (immersion in 0.1 and 1 M KF solution treatments, 0.1 M FST and 1 M FST, respectively) were analyzed in order to improve Mg mechanical and corrosion resistance, respectively. Open circuit potential measurements, polarization techniques (PT), scanning electrochemical microscopy (SECM) and electrochemical impedance spectroscopy (EIS) were performed to evaluate its corrosion behavior. SECM showed that the local current of attacked areas decreased during the F- treatments. The corrosion inhibitory action of 0.1 M FST and 1 M FST in phosphate buffered solution was assessed by PT and EIS. Under the experimental conditions assayed, 0.1 M FST revealed better performance. X-ray photoelectron spectroscopy, energy dispersive X-ray and X-ray diffraction analyses of Mg(PM) with 0.1 M FST showed the presence of KMgF3 crystals on the surface while a MgF2 film was detected for 1 M FST. After fluoride inhibition treatments, promising results were observed for Mg(PM) as degradable metallic biomaterial due to its higher yield strength and lower initial corrosion rate than untreated Mg, as well as a progressive loss of the protective characteristics of the F--containing film which ensures the gradual degradation process. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.