Biyobozunur ZW21 Döküm Alaşımlarının Mikroyapı, Sertlik ve Korozyon Özelliklerini İncelenmesi

Öz

Bu çalışmada, Çinko (Zn) ve İtriyum (Y) içeren magnezyum (Mg) alaşımlarından ZW21 alaşımı kokıl kalıba dökülerek üretimleri yapılmıştır ve daha sonra mikroyapı, sertlik, korozyon ve aşınma özellikleri incelenmiştir. Üretilen alaşımların mikroyapı görüntüleri, zımparalama, parlatma ve dağlama gibi klasik metalografik yöntemleriyle yapılmıştır. Mikroyapı görüntüleri optik ve SEM cihazları ile alınmış ve EDX analizleri yapılmıştır. Metalografik olarak hazırlanan numunelerin sertlikleri Brinell sertlik test cihazı ile tespit edilmiştir. In vitro deneyleri gerçekleşebilmek için, potansiyodinamik polarizasyon ve daldırma testleri Hank sıvısında (36.5 ± 0.5ºC) sıcaklığında yapılmıştır. Ayrıca, korozif Aşınma testlerinde, sabit yük altında, sabit hız, mesafede, Hank sıvısında ileri-geri aşınma yöntemiyle yapılmıştır. XRD sonuçlarına göre I ve W fazlarının varlığı tespit edilmiştir. Malzemelerin sertliği 52.55 HV olarak bulunmuştur. Korozyon hızının zamanla yavaşladığı ve numune yüzeylerinde oksit film tabaksı oluşturulduğunu gözlenmiştir. Korozif aşınmada mesafeye bağlı olarak önemli bir ağırlık kaybı tespit edilmiştir.

Anahtar Kelimeler

• Mg-Zn-Y Alaşımları
• ZW21
• Mikroyapı
• Sertlik
• Hank sıvısı
• Korozyon
• Korozif Aşınma.
• Mg-Zn-Y Alloys
• Microstructure
• Hardness
• Hank’s solution
• Corrosion
• Corrosive Aşınma.

An Investigation On Microstructural, Hardness and Corrosion Properties of As-Cast ZW21 Biodegredable Alloy

Abstract

In this study, ZW21 alloy one of magnesium (Mg) alloys containing Zinc (Zn) and Yttrium (Y) was produced by gravity casting method then its microstructure, hardness, corrosion and wear properties were investigated. The microstructure images of the produced alloys were made by classical metallographic methods such as sanding, polishing and etching. Microstructure images were taken with optical and SEM devices and EDX analyzes were performed. The hardness of the metallographically prepared samples was determined by Brinell hardness tester. To achieve in vitro experiments, potentiodynamic polarization and immersion tests were performed in Hank's solution at (36.5 ± 0.5ºC). In addition, in the corrosive wear tests, a reciprocating wear test device was used to implement the necessary experiments under constant load, at constant speed and distance also with Hank's contact conditions. According to XRD results, the presence of I and W phases was determined. The hardness of the materials was found to be 52.55 HV. It was observed that the corrosion rate slowed down over time and an oxide film layer was formed on the sample surfaces. A significant mass loss was detected in corrosive wear depending on the distance.

Keywords

• Mg-Zn-Y Alloys
• Microstructure
• Hardness
• Hank’s solution
• Corrosion
• Corrosive Aşınma.

Kaynakça

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