Corrosion behavior in SBF for titania coatings on Mg–Ca alloy
Corrosion behavior in SBF for titania coatings on Mg–Ca alloy
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DOI：
10.1007/s10853-010-5083-2
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发表时间：
2011-04
影响因子：
4.5
通讯作者：
Meiheng Li;Qian Chen;Wenjing Zhang;Wangyu Hu;Yong-liang Su
中科院分区：
文献类型：
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作者：
Meiheng Li;Qian Chen;Wenjing Zhang;Wangyu Hu;Yong-liang Su
为提高镁钙合金在人体环境中的耐蚀性，采用溶胶-凝胶法制备了二氧化钛涂层。通过电化学测试和模拟体液(SBF)浸泡实验，研究了涂层为TiO2的镁钙合金的腐蚀行为。裸露的镁钙合金在模拟体液中浸泡48h后受到严重腐蚀，而有TiO2涂层的镁合金在模拟体液中浸泡168h后，表面几乎保持完好，只有几次塌陷。电化学测试结果表明，镁合金的自由腐蚀电流(ICORR)为3.3275e−2A/cm~2，而TiO2涂层的ICOR值仅为1.58549e−5A/cm~2。因此，TiO2涂层显著提高了镁钙合金在SBF中的耐蚀性能。这增强了镁钙合金作为可生物降解骨科材料的潜力。
TiO2coating was obtained by sol–gel method to improve the corrosion resistance of Mg–Ca alloy in human body environment. The corrosion behavior of Mg–1.0 Ca alloy with TiO2coating was investigated by electrochemical tests and immersion tests in simulated body fluid (SBF). Bare Mg–1.0 Ca alloy suffered serious attack after immersed in simulated body fluid only for 48 h. While for the Mg–1.0 Ca alloy with TiO2coating, the surface almost maintained intact with only several collapses after immersed in SBF for 168 h. The electrochemical test results showed that the free corrosion current (icorr) of Mg–1.0 Ca alloy substrate was 3.3275e−2A/cm2, while theicorrof TiO2coating was only 1.58549e−5A/cm2. Therefore, TiO2coating significantly improved the corrosion resistance of Mg–1.0 Ca alloy in SBF. This enhances the potential of Mg–Ca alloy used as biodegradable orthopedic material.