Yapay Vücut Sıvılarında Nikel-Titanyum Alaşımlarının Korozyon Davranışının İncelenmesi

Yıl 2025, Cilt: 40 Sayı: 4 , 819 - 826 , 29.12.2025

Büşra Dağ , Güray Kılınççeker

https://doi.org/10.21605/cukurovaumfd.1747377

https://izlik.org/JA58AC72TE

Öz

Nikel titanyum alaşımı olan Nitinol metali; biyouyumlu yapısı, işlenebilirliği, dayanıklı mekanik özellikleri ile biyomalzeme olarak tercih edilmektedir. Biyomalzemelerin insan vücudundaki sıvılarla (ter, tükürük, doku sıvısı vb.) etkileşimi, bu etkileşim sırasında vücuda iyon salımı ile oluşabilecek toksik etkilerin araştırılması açısından önemlidir. Vücut sıvıları çok aşırı saldırgan olmamalarına rağmen doğrudan ya da dolaylı olarak metalle etkileşmeleri halinde metalin korozyona uğraması kaçınılmazdır. Bu çalışmada Nitinol metalinin farklı vücut sıvılarında korozyon davranışları vücut sıcaklığı olarak kabul edilen 37°C’de elektrokimyasal olarak incelenmiştir. Sonuç olarak; Nitinol yüzeyinde doğal olarak pasif oksit filmi oluşumu gözlenmiş ve kararlılığı farklı vücut sıvılarında değişiklik göstermiştir. EIS sonuçları Fusayama Meyer’in yapay tükürük çözeltisi, PBS çözeltisi ve Hank’ın yapay vücut sıvısı için sırasıyla, 6.85 x105 ohm.cm2, 8.35 x105 ohm.cm2, 3.82 x106 ohm.cm2 dir. Potansiyodinamik polarizasyon eğrileri, EIS sonuçları ile uyumludur. Nitinol alaşımının yüzeyinde oluşan pasif oksit filmin Hank’ın yapay vücut sıvısı içerisinde daha kararlı yapıya sahip olduğu ve korozyona karşı daha dirençli olduğu belirlenmiştir.

Anahtar Kelimeler

NiTinol , biyomalzeme , korozyon , EIS

Corrosion Behavıor of Nickel-Titanium Alloy in Simulated Body Fluids

https://izlik.org/JA58AC72TE

Öz

Nitinol, a nickel–titanium alloy, is widely used as a biomaterial because of its strong biocompatibility, ease of processing, and stable mechanical performance. However, its interaction with body fluids such as sweat, saliva, and tissue fluid is critical, since even relatively mild biological environments can still lead to corrosion and metal-ion release. In this study, the corrosion behavior of Nitinol was investigated electrochemically at 37 °C to simulate human body temperature. A naturally formed passive oxide layer was detected on the alloy surface, and its stability varied depending on the solution. EIS measurements showed impedance values of 6.85 × 10⁵ ohm.cm² in Fusayama Meyer artificial saliva, 8.35 × 10⁵ ohm.cm² in PBS, and 3.82 × 10⁶ ohm.cm² in Hank’s solution. Potentiodynamic polarization results supported these findings. Overall, the passive film demonstrated the greatest stability and corrosion resistance in Hank’s artificial body fluid, indicating Nitinol’s strong suitability for long-term biomedical use.

Anahtar Kelimeler

NiTinol , biomaterial , corrosion , EIS

Kaynakça

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