مهندسی متالورژی

مهندسی متالورژی

بررسی ویژگی‌های خوردگی آلیاژ زیست‌تخریب‌پذیر Zn-1Mg-xCu در محلول شبیه‌سازی شده بدن

نوع مقاله : مقاله پژوهشی

نویسندگان
سعید فراهانی 1
الهام چراغعلی 2
شکوفه برهان 1
1 استادیار، گروه مهندسی مواد، شیمی و پلیمر، مرکز آموزش عالی فنی و مهندسی بوئین‌زهرا، بوئین‌زهرا، ایران.
2 کارشناس، گروه مهندسی مواد، شیمی و پلیمر، مرکز آموزش عالی فنی و مهندسی بوئین‌زهرا، بوئین‌زهرا، ایران.
10.22076/me.2025.2037403.1413
چکیده
آلیاژهای جدیدِ پایه روی با ترکیب 1% منیزیم و درصدهای متفاوت مس (Zn-1Mg-xCu) به روش ریخته‌گری تولید شده و از نظر خواص خوردگی و ریزساختاری مورد بررسی قرار گرفتند. آزمون پلاریزاسیون و طیف سنجی امپدانس الکتروشیمیایی در سل حاوی محلول شبیه ساز بدن انجام شد و دانسیته جریان خوردگی (icorr) و پتانسیل خوردگی (Ecorr) محاسبه گردید. همچنین آزمون غوطه‌وری در درون محلول شبیه ساز بدن برای مدت زمان 24 و 168 ساعت انجام شد و تغییرات وزن نمونه و pH محلول اندازه‌گیری شد. نتایج نشان داد که دانسیته جریان خوردگی با افزودن مس به آلیاژ دوتایی Zn-1Mg افزایش می‌یابد. بیشترین مقدار دانسیته جریان خوردگی به میزان 87/12 میکرو آمپر بر سانتی متر مربع برای آلیاژ Zn-1Mg-4Cu بدست آمد. پتانسیل خوردگی با افزودن مس در تمامی مقادیر افزایش چشمگیری نشان نداد. نتایج آزمون طیف سنجی امپدانس الکتروشیمیایی نشان داد که با افزایش مس، مقاومت به خوردگی کاهش یافت. بیشترین مقاومت مربوط به آلیاژ Zn-1Mg-1Cu بود. با افزایش مقدار مس، کسر حجمی فاز یوتکتیکی Zn/Mg-Cu بیشتر شده است در نتیجه نسبت سطح کاتد به آند کاهش یافته و نرخ خوردگی افزایش می‌یابد. تغییری در وزن نمونه ها و نیز pH محلول شبیه ساز بدن پس از گذشت 24 ساعت مشاهده نشد. بیشترین میزان کاهش وزن به میزان 9/103 میلی گرم و افزایش pH به 8/7 مربوط به آلیاژ Zn-1Mg-4Cu پس از گذشت 168 ساعت بود. این تغییرات در خواص خوردگی آلیاژ سه تایی Zn-1Mg-xCu می‌تواند بدلیل تشکیل زوج گالوانیکی بین زمینه دندریتی غنی از روی و فاز یوتکتیکی Zn/Mg-Cu باشد.
کلیدواژه‌ها
روی
زیست‌تخریب‌پذیر
خوردگی
پلاریزاسیون
غوطه‌وری
محلول شبیه سازی شده بدن

عنوان مقاله English

An Investigation of the Corrosion Characteristics of Zn-1Mg-xCu Biodegradable Alloy in Simulated Body Fluid

نویسندگان English

Saeed Farahany 1
Elham Cheraghali 2
Shokoufeh Borhan 1
1 Assistant Professor, Department of Materials, Chemical and Polymer Engineering, Buein Zahra Technical University, Buein Zahra, Iran.
2 B.Sc., Department of Materials, Chemical and Polymer Engineering, Buein Zahra Technical University, Buein Zahra, Iran.
چکیده English

In this research, novel zinc-based alloys with a fixed composition of 1 wt% Mg and varying amounts of copper (Zn-1Mg-xCu) were fabricated through casting and subsequently evaluated for their corrosion properties and microstructural characteristics. Polarization and electrochemical impedance spectroscopy (EIS) tests were conducted in a specialized cell containing simulated body fluid, and corrosion current density (icorr) and corrosion potential (Ecorr) were calculated. Additionally, immersion tests in simulated body fluid were performed for durations of 24 and 168 hours, during which changes in sample weight and solution pH were measured. The results indicated that the corrosion current density increased with the addition of copper to the binary Zn-1Mg alloy. The highest corrosion current density, measuring 12.87 𝜇A/cm2, was observed in the Zn-1Mg-4Cu alloy. The corrosion potential did not exhibit a significant increase with the addition of copper across all compositions. Electrochemical impedance spectroscopy results demonstrated a decrease in corrosion resistance as the copper content increased. The Zn-1Mg-1Cu alloy exhibited the highest resistance. Higher copper content led to a larger volume fraction of Zn/Mg-Cu eutectic, decreasing the cathode-to-anode ratio and increasing corrosion. No discernible changes in sample weight or the pH of the simulated body fluid were observed after 24 hr. After 168 hours, the Zn-1Mg-4Cu alloy experienced a maximum weight loss of 103.9 mg and a pH increase to 7.8. The formation of galvanic couples between the zinc-rich dendritic matrix and the Zn/Mg-Cu eutectic phase is responsible for these changes in the corrosion properties of the ternary Zn-1Mg-xCu alloy.

کلیدواژه‌ها English

Zinc
Biodegradable
Corrosion
Polarization
Immersion
Simulated body fluid

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  • تاریخ دریافت 13 مرداد 1403
  • تاریخ بازنگری 02 بهمن 1403
  • تاریخ پذیرش 08 اردیبهشت 1404