نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
2 دانشجوی دکترا، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
3 استاد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
چکیده
بیوکامپوزیت‌های منیزیمی به دلیل خواص زیست‌سازگاری و زیست‌تجزیه‌پذیری به یکی ازگزینه‌های بسیار مناسب در کاربرد‌های ایمپلنت‌های ارتوپدیک تبدیل شده‌اند. اما، نرخ خوردگی بالای منیزیم باعث تخریب سریع‌تر آن در محیط‌های خورنده می‌شود که این امر منجر به شکست زود هنگام ایمپلنت پیش از بهبود کافی استخوان می‌گردد. در همین راستا، نیاز است تا فرآیند‌های اصلاح سطحی بر روی آن صورت گیرد تا مقاومت به خوردگی را بهبود بخشد. در این تحقیق، به بررسی تاثیر دو فرآیند اصلاح سطحی ساچمه‌زنی و الکتروریسی بر خواص خوردگی کامپوزیت منیزیم/هیدروکسی‌آپاتیت پرداخته شده است. فرآیند ساچمه‌زنی با استفاده از ساچمه‌های شیشه‌ای در شدت آلمنmmN 0.3 و با میزان پوشش 100 درصد بر روی کامپوزیت انجام شده است. فرآیند الکتروریسی نیز با استفاده از نانوالیاف از جنس پلی‌کاپرولاکتون (PCL) در ولتاژ kV 18 به مدت 30 دقیقه صورت گرفته است. آزمون‌های کشش- فشار روی نمونه کامپوزیت، پایش pH و کاهش وزن به روش غوطه‌وری روی نمونه‌های ساچمه‌زنی شده و پوشش‌دهی شده انجام شده است. نتایج نشان می‌دهد الکتروریسی نرخ خوردگی منیزیم را در مدت زمان 1 روز و 7 روز به ترتیب به مقدار 75% و 40% کاهش داده است. ساچمه‌زنی نیز به همین ترتیب توانسته است نرخ خوردگی را به مقدار 35% و 20% کاهش دهد. الکتروریسی به دلیل سطح ویژه بالا جهت جذب کلسیم فسفات منجر به کاهش سطح تماس محلول خورنده شده و نرخ خوردگی را کاهش می‌دهد. ساچمه‌زنی نیز به دلیل تسریع در ایجاد لایه غیرفعال می‌تواند خوردگی را به تاخیر بیاندازد و در کوتاه مدت منجر به افزایش مقاومت خوردگی شود.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Investigating the effects of shot peening and Polycaprolactone (PCL) electrospinning surface treatments on the corrosion properties of Mg-2.5٪HA biocomposite
نویسندگان [English]
- Ali Negahban 1
- Milad Shamsi 2
- Mohammad Sedighi 3
1 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
چکیده [English]
Due to its biocompatibility and biodegradability, magnesium has become a very suitable candidate for orthopedic implant applications. However, its high corrosion rate leads to rapid deterioration in corrosive environments, resulting in premature failure of the implant before sufficient bone healing. In this regard, surface modifications are required to improve corrosion resistance. This research investigates the effect of two surface modifications, shot peening and electrospinning, on the corrosion properties of magnesium/hydroxyapatite composite. Shot peening was performed using glass beads at an Almen intensity of 0.3 mmN and with 100٪ coverage on the surface of the composite. Electrospinning was carried out using Polycaprolactone (PCL) nanofibers at 18 kV for 30 minutes. Tensile-compressive tests were performed on the composite specimens. Also, pH monitoring and weight loss tests were conducted on the shot peened and electrospun samples. The results show that electrospinning decreased the corrosion rate of magnesium by 75٪ and 40٪ after 1 day and 7 days of immersion, respectively. Shot peening also reduced the corrosion rate by 35٪ and 20٪, respectively. Electrospinning reduced the corrosion rate by limiting the contact surface area between the corrosive solution and magnesium due to its high specific surface area for calcium-phosphate absorption. Shot peening, on the other hand, delayed the corrosion by accelerating the formation of a passive layer, leading to increased corrosion resistance in short periods.
کلیدواژه‌ها [English]
- Mg-based biocomposite
- Surface treatment
- Coating
- Shot peening
- Electrospinning
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