Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 27, No. 10 (October 2014) 1627-1634   

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  SURFACE ACTIVATION OF NITI ALLOY BY USING ELECTROCHEMICAL PROCESS FOR BIOMIMETIC DEPOSITION OF HYDROXYAPATITE COATING (TECHNICAL NOTE)
 
M. Yousefpour, I. Vali and E. Saebnoori
 
( Received: May 08, 2014 – Accepted: June 26, 2014 )
 
 

Abstract    Electrochemical depositions of calcium phosphate (Ca-P) film on NiTi alloy in concentrated simulated body flood (SBF×5) were carried out by cathodic polarization. The Ca-P layer was successfully deposited on Ni-Ti alloy substrate under 10mA/cm2 current density for 2 hours at room temperature. Then, in order to investigate the bioactivity of the pre-calcified samples, they were immersed in SBF for 1 and 3 days. The microstructure, composition and bioactivity of the coatings were evaluated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. Results showed that the activation of the surface of the NiTi alloy by electrochemical process can significantly enhance the biomimetic deposition during time. On the other hand, by increasing immersion time of pre-calcified samples in SBF from 1 to 3 days, the biomimetic coating uniformly covered the surface of the sample. The ratio of the Ca/P for the pre-calcified sample after immersion in SBF for 3 days was about 1.5 which is very close to the Ca/P ratio of stoichiometric hydroxyapatite.

 

Keywords    NiTi alloy; Electrodeposition, Bioactivity, Biomimetic coating, Hydroxyapatite

 

چکیده    تشکیل لایه فسفات کلسیم بر روی آلیاژ نایتانول از محلول غلیظ شبیه­سازی شده بدن توسط فرآیند رسوب الکتریکی بصورت کاتدی انچام شد. این لایه بر روی آلیاژ نایتانول با اعمال چگالی جریان برابر با 10 امپر بر سانتی­متر مربع در دمای اتاق و در مدت زمان 2 ساعت ایجاد شد. سپس، برای بررسی زیست فعال شدن سطح نمونه­هایی لایه دار، این نمونه­ها به مدت زمان 1 و 3 روز در دمای اتاق در داخل محلول شبیه­سازی شده بدن قرار داده شدند. برای مشخصه­یابی ریزساختار، ترکیب شیمیایی، ریخت­شناسی و زیست فعالی نمونه­هایی لایه­دار به ترتیب از میکروسکوپ الکترونی، طیف­سنجی تفکیک انرژی، پراش­سنجی پرتوهایی ایکس و طیف­سنجی پرتوهایی فراسرخ استفاده گردید. نتایج حاصل نشان داد که زیست فعال شدن سطح آلیاژ نایتانول توسط فرآیند الکتروشیمیایی بطور قابل ملاحظه در حین رسوب لایه بایومیمیتیک افزایش یافت. به عبارت دیگر، با افزایش زمان قرار­گیری نمونه­هایی لایه دار در داخل محلول شبیه­سازی شده بدن از 1 روز به 3 روز، لایه بایومیمتیک بر روی سطح نمونه­ها بطور یکنواخت ایجاد می­شود و نسبت کلسیم به فسفر در لایه تشکیل شده از محلول شبیه­سازی شده بدن در مدت زمان سه روز به سمت نسبت استوکیومتریک لایه شبه آپاتیت میل نموده و به مقدار 5/1 نزدیک می­شود.

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