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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effect of Hydroxyapatite Coatings on the Passivation Behavior of Oxidized and Unoxidized Superelastic Nitinol Alloys
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The Effect of Hydroxyapatite Coatings on the Passivation Behavior of Oxidized and Unoxidized Superelastic Nitinol Alloys

机译：羟基磷灰石涂层对氧化和未氧化超弹性镍钛合金钝化行为的影响

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摘要

Nitinol alloys have been used in various biological applications due to their superior properties. In this study, a bipolar pulsed current electrodeposition technique was applied to produce a hydroxyapatite (HA) film on the Nitinol alloy. Also, the protection performance of the coating was evaluated on both abraded and thermochemically modified alloy. According to obtained data, reducing the electrocrystallization rate by the pulse deposition technique can promote HA formation on both abraded and modified substrates. Based on scanning electron microscopy and high-resolution transmission electron microscopy data, the HA coatings revealed a flake-like morphology and each flake was composed of nano-crystalline grains. Atomic force microscopy images revealed that flakes on the abraded substrate were smaller in size than that of the modified alloy. Comparing the corrosion resistance of the bare substrates revealed that the modified alloy has a higher corrosion resistance than the abraded alloy and the modified surface is well passivized during anodic polarization in Ringer's solution. However, this condition is reversed after the deposition of HA film. It seems that because of the lower crystallization sites on the abraded alloy, the produced HA film is denser and more protective against the corrosive mediums as compared to the coating on the modified alloy. Although the HA coating can improve the bioactivity of both substrates, the resulted film on the oxidized alloy is porous and deteriorates the implant permanence in the vicinity of body fluids.
机译：由于其优异的性质，镍钛合金合金已在各种生物应用中使用。在该研究中，施用双极脉冲电流电沉积技术在镍钛合金合金上产生羟基磷灰石（HA）膜。而且，在磨损和热化学改性合金中评价涂层的保护性能。根据所获得的数据，通过脉冲沉积技术降低电镀率率可以促进磨损和改性基板上的HA形成。基于扫描电子显微镜和高分辨率透射电子显微镜数据，HA涂层揭示了片状形态，每个薄片由纳米结晶颗粒组成。原子力显微镜图像显示，磨砂基材上的薄片的尺寸小于改性合金的较小。比较裸衬底的耐腐蚀性显示，改性合金具有比磨损合金更高的耐腐蚀性，并且改性表面在振铃溶液中的阳极偏振期间很好地钝化。然而，在沉积HA薄膜后，这种状况颠倒。似乎由于磨损合金上的较低的结晶位点，与改性合金上的涂层相比，所生产的HA膜对腐蚀性介质更密集，更加保护。虽然HA涂层可以改善两个基材的生物活性，但是氧化合金上所得到的薄膜是多孔的，并且在体液附近脱气。

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