رفتار الکتروشیمیایی و چسبندگی پوشش‌های الکتروفورتیک نانوساختار HA-TiO2
محورهای موضوعی : بیومواد
1 - هیئت علمی تمام وقت گروه مهندسی متالورژی
کلید واژه: هیدروکسی آپاتیت, خوردگی, تیتانیا, لایه نشانی الکتروفورتیک, چسبندگی,
چکیده مقاله :
در این پژوهش، پوشش‌های کامپوزیتی از نانوذرات HA/TiO2 با ترکیب 0، 10 و 20 درصد وزنی TiO2 به روش لایه نشانی الکتروفورتیک در ولتاژ 20 ولت و زمان 3 دقیقه ایجاد شدند. برای مطالعه رفتار الکتروشیمیایی پوشش‌ها در محلول شبیه سازی شده بدن (SBF) در دمای oC 37، آزمون خوردگی به روش پلاریزاسیون پتانسیودینامیک انجام شد. به منظور بررسی تشکیل آپاتیت بر سطح پوشش‌ها و تاثیر حضور اکسید تیتانیم، پوشش‌ها از آزمون طیف‌سنجی امپدانس الکتروشیمیایی (EIS) استفاده شد. نحوه تغییرات پارامترهای مدار معادل با تشکیل آپاتیت در زمان‌های مختلف محاسبه شده و مورد تجزیه و تحلیل قرار گرفت. کمترین مقدار چگالی جریان خوردگی (icorr) در مقابل بیشترین مقدار پتانسیل خوردگی (Ecorr) و مقاومت پلاریزاسیون (Rp) در نمونه کامپوزیتی با 20 % وزنی TiO2 مشاهده شد. بر اساس آنالیز شیمیایی ICP از غلظت یون کلسیم موجود در داخل محلول SBF مشاهده شد که سرعت انحلال در داخل محلول برای نمونه HA در مقایسه با سایر نمونه‌ها بیشتر است و با افزایش مقدار فاز هیدروکسی آپاتیت در ساختار پوشش انحلال بیشتری صورت می‌گیرد. بعد از 15 روز غوطه‌وری مقدار غلظت یون کلسیم داخل SBF برای نمونه کامپوزیتی با 20 % وزنی TiO2 تقریباً ثابت می‌ماند که نشان دهنده رسیدن سریعتر به شرایط پایدار و کامل شدن تشکیل آپاتیت بر سطح این پوشش‌ها است. همچنین استحکام چسبندگی پوشش‌ها با افزودن تیتانیا در نمونه با 20 % وزنی TiO2، تقریبا 2 برابر افزایش یافت.
In the present study, the HA-TiO2 nanostructured composite coatings with 0, 10 and 20 wt% TiO2 were fabricated by electrophoretic deposition at 20 V for 3 min. Electrochemical corrosion behavior of the samples was conducted in SBF solution at 37oC by potentiodynamic polarization tests. For the effect of titania on apatite formation, electrochemical impedance spectroscopy after in-vitro tests were conducted on coatings. The variation of electrochemical parameters in equivalent circuit with different times of apatite formation was discussed for each sample. The lowest corrosion current density (icorr) and the highest corrosion potential (Ecorr) and linear polarization resistance (Rp) were obtained for HA-20 wt% TiO2 sample. The EIS analysis revealed that the total resistance of HA-20 wt% TiO2 sample is higher than that of other samples. The ICP analysis of Ca2+ concentration of SBF solution showed that the highest dissolution rate was achieved for HA sample. The concentration of Ca2+ of HA-20 wt% TiO2 sample remained almost constant after 15 days immersion which indicated the accelerated apatite formation. Moreover, the bonding strength of coating was increased by a factor of 2 with the addition of titania in HA-20 wt% TiO2 sample.
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