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The Effect of Hydroxyapatite Coatings on the Passivation Behavior of Oxidized and Unoxidized Superelastic Nitinol Alloys

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Abstract

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.

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Acknowledgments

The authors would like to acknowledge the financial support of Iran National Science Foundation (INSF) under the Contract No. 92004023. Also, the authors would like to acknowledge Prof. Ö. Dag from Bilkent University, Turkey for the use of facilities and valuable discussions on ATR-FTIR data and Prof. G. Eggeler and Dr. A. B. Parsa from Ruhr-University Bochum, Germany for TEM studies.

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  1. Faculty of Materials Engineering, Research Center for Advanced Materials, Sahand University of Technology, Tabriz, 5133511996, Iran

    M. R. Etminanfar, J. Khalil-Allafi & S. O. R. Sheykholeslami

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  1. M. R. Etminanfar
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Etminanfar, M.R., Khalil-Allafi, J. & Sheykholeslami, S.O.R. The Effect of Hydroxyapatite Coatings on the Passivation Behavior of Oxidized and Unoxidized Superelastic Nitinol Alloys. J. of Materi Eng and Perform 27, 501–509 (2018). https://doi.org/10.1007/s11665-018-3200-6

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  • DOI: https://doi.org/10.1007/s11665-018-3200-6

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