Hidroksiapatit kaplanmış Al2024'ün simüle edilmiş vücut sıvısında in-vitro korozyon performansı: Karşılaştırmalı bir çalışma

Yıl 2023, Cilt: 12 Sayı: 3, 926 - 934, 15.07.2023

Mehmet Topuz Burak Dikici

https://doi.org/10.28948/ngumuh.1263697

Öz

Bu çalışmada, hidroksiapatit (HA) kaplamaların Al-Cu-Mg alaşımları (Al2024) üzerine uygulanabilirliği elektrokimyasal tekniklerle incelenmiştir. Kaplanan tabakaların yapısal karakterizasyonları SEM, EDS ve XRD test/analizleri ile incelenmiştir. Yüzey adezyon direnci ve elektrokimyasal bozunma davranışı, sırasıyla çizilme ve potansiyodinamik tarama (PDS) testleri ile test edilmiştir. Al2024 yüzeylerinde HA kaplamanın homojen bir yapıya sahip olduğu ancak kesit görüntülerinden bazı lokal bölgelerin yeterince HA ile kaplanamadığı görülmüştür. Ayrıca kaplama yüzeyleri, HA kaplamalara özgü mikro gözenekli morfolojiye sahip olduğu tespit edilmiştir. Kaplamanın çizilme testi sonuçlarından, kritik yük direncinin (Lc1), 12N’un biyomedikal uygulamalar için yeterli olacağı öngörülmüştür. Elektrokimyasal korozyon testleri, HA kaplamanın Al2024 alaşımının korozyon akımı yoğunluğunu (Icorr) ve korozyon oranını azalttığını ortaya çıkarmıştır (HA kaplı ve kaplanmamış Al2024 alaşımı için sırasıyla 0,885 ve 5,260 µA·cm-2). Ancak HA kaplama ile elde edilen düşük Icorr değerine rağmen hem Icorr hem de pasivasyon akım yoğunluğu (Ipass) değerlerinin (HA kaplama için 3,15 µA·cm-2, farklı titanyum türleri için 0.03 ila 0.08 µA·cm-2) olduğu gözlemlenmiş olup ticari titanyum alaşımlarına kıyasla yetersiz olduğu ortaya çıkarılmıştır.

Anahtar Kelimeler

Al2024, Hidroksiapatit, Simule edilmiş vücut sıvısı, Sol-jel kaplama

In-vitro corrosion performance of hydroxyapatite-coated Al2024 in simulated body fluid: A comparative study

Öz

In this study, the applicability of hydroxyapatite (HA) coatings on Al-Cu-Mg alloys (Al2024) was investigated by electrochemical techniques. The structural characterizations of the coated layers were investigated by SEM, EDS, and XRD equipment. The surface adhesion resistance and electrochemical degradation behavior were tested by scratch and potentiodynamic scanning (PDS) tests, respectively. It was observed that the HA coating had a homogeneous structure on the Al2024 surfaces, but some local areas could not be adequately coated with HA from the cross-section images. Also, the coating surfaces were microporous morphology, which is specific to the HA coatings. From the scratch test results of the coating, it was predicted that the critical load resistance (Lc1), 12N, would be sufficient for biomedical applications. Electrochemical corrosion tests revealed that HA coating decreased the corrosion current density (Icorr) and corrosion rate of the Al2024 alloy (0.885 and 5.260 µA·cm-2 for HA-coated and uncoated Al2024 alloy, respectively). However, despite the low Icorr value obtained with HA coating, it was observed that both Icorr and passivation current density (Ipass) values (3.15 µA·cm-2 for HA coating, 0.03 to 0.08 µA·cm-2 for different types of titanium alloys) were insufficient when compared to commercial titanium alloys.

Anahtar Kelimeler

Al2024, Hydroxyapatite, Simulated body fluid, Sol-gel coating

Kaynakça

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