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Title

Effect of pretreatment on nickel release from NiTi alloy and microstructure of calcium phosphate coating applied by pulsed current electrochemical deposition

Year: 1399
COI: IMES14_308
Language: EnglishView: 186
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Authors

Leila Fathyunes - Assistant professor, Department of Materials Science and Engineering, University of Bonab, 5551761167,Bonab, Iran
Seyed Omid Reza Sheykholeslami - Faculty of Materials Engineering, Research Center for Advanced Materials, Sahand University of Technology, 5133511996, Tabriz, Iran
Vida khalili - Assistant professor, Department of Materials Science and Engineering, University of Bonab, 5551761167, Bonab, Iran

Abstract:

Despite having the superior mechanical properties, NiTi alloy could not meet all clinical requirementsfor implants. The bio-inert surface of this alloy is one of the reasons for failing its implantation.Releasing the high amount of harmful nickel ions from NiTi alloy is another serious concern causingallergic problems such as inflammation and cells death. Therefore, the surface modification of this alloyis necessary for improving its performance in the biomedical applications. In this work, the surfacemodification of NiTi was carried out by pretreatment and applying the bioactive calcium phosphatecoating. For pretreatment of NiTi alloy, we used two different processes of alkaline treatment in 5 MNaOH solution at 60 °C for 24 hour and heat treatment at 500 ˚C for 30 minute. Moreover, a bioactivecoating of calcium phosphate was applied by pulsed current electrochemical deposition at a constantcurrent density of 15 mA/cm2 and duty cycle of 0.1 on the pretreated surface of NiTi. The results showedthat heat treatment further decreased the nickel release from NiTi into Ringer's solution as compared tothe alkaline treatment. Moreover, wettability of the NiTi sample pretreated with these two processeswas different that affected the microstructure of the top calcium phosphate coating. In fact, the highersurface tension resulted from increasing the wettability caused the formation of porosities with largersize in the microstructure of the coating applied by electrochemical deposition method.

Keywords:

NiTi, alkaline treatment, heat treatment, calcium phosphate coating, electrochemical deposition, nickel release, microstructure

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This Paper COI Code is IMES14_308. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1133569/

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Fathyunes, Leila and Sheykholeslami, Seyed Omid Reza and khalili, Vida,1399,Effect of pretreatment on nickel release from NiTi alloy and microstructure of calcium phosphate coating applied by pulsed current electrochemical deposition,9th International Conference & Exhibition on Materials Science & Metallurgical Engineering (iMat2020),https://civilica.com/doc/1133569

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Type of center: دانشگاه دولتی
Paper count: 390
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