钛合金微弧氧化医用涂层形成机制
Formation Mechanism of Micro-arc Oxidation Medical Coating on Titanium Alloy Surface
摘 要
利用微弧氧化技术在钛合金表面制备了医用涂层, 通过SEM观测不同氧化阶段涂层形貌, 并分析各阶段微弧放电特性。研究了两极电化学反应过程, 建立了工作液负载等效电路, 提出了钛合金微弧氧化生成羟基磷灰石医用陶瓷涂层机制。结果表明, 电压会直接决定试样表面的电荷分布, 增加表面电荷积累, 增强工作液中带电钙、磷粒子的扩散和电泳程度, 从而加速涂层物质的瞬间反应。
等效电路
羟基磷灰石
电泳
micro-arc oxidation
equivalent circuit
hydroxyl-apatite
electrophoresis
Abstract
Medical coatings on titanium alloy surface were prepared by micro-arc oxidation (MAO). The morphology characteristics of coatings at different oxidation stages were observed by scanning electron microscopy(SEM). The micro-arc discharge characteristics and electrochemical reaction of the two electrods were studied. The equivalent circuit of electrolyte load was established and analyzed. The hydroxyl-apatite(HA) coating formation mechanism of MAO was proposed. The results showed that the voltage could affect the charge distribution on specimen surface directly. The charge accumulation was enhanced, and the diffusion and electrophoresis degree of Ca2+and PO43- increased in electrolyte, which accelerated the instant reaction for the substances in coating.
中图分类号 TG174
所属栏目 试验研究
基金项目
收稿日期 2011/8/16
修改稿日期
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作者单位点击查看
联系人作者王凤彪(wfb_0_0@163.com)
备注王凤彪, 讲师, 博士,
引用该论文: WANG Feng-biao,DI Shi-chun. Formation Mechanism of Micro-arc Oxidation Medical Coating on Titanium Alloy Surface[J]. Corrosion & Protection, 2012, 33(5): 400
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参考文献
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【2】Nie X, Leyland A, Matthews A. Deposition of layered bioceramic hydroxyapatite/TiO2 coatings on titanium alloys using a hybrid technique of micro-arc oxidation and electrophoresis[J]. Surfaces Coating Technology, 2000, 125(1/3):407-414.
【3】Dittrick K H, leoazd L G. Micro-arc oxidation of aluminum components[J]. Cryst Res Technology, 1984, 19(1):93-96.
【4】Yahaom J, Zahavi J. Electrolytic breakdown crystallization of anodic oxide films on Al, Ta and Ti[J]. Electrochimica Acta, 1970, 15(9):14-29.
【5】Vijh A K. Sparking voltages and side reactions during anodization of valuemetals in terms of electron tunneling[J]. Corrosion Science, 1971, 11(6):41.
【6】Yerokhin A L, Nie X, Leyland A, et al. Plasma electrolysis for surface engineering[J]. Surfaces Coatings Technology, 1999, 122(2/3):73-93.
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