Metalik malzemeler üzerine kendi kendini iyileştiren kaplamaların geliştirilmesi ve karakterizasyonu

Öz

Malzeme yüzeylerine uygulanan koruyucu kaplamalarda, mekanik gerilim, termal dalgalanma ve kimyasal bozunma nedeniyle hasar ve çatlak oluşumu kaçınılmazdır. Çoğu zaman tespit edilmesi zor ve onarımı neredeyse imkânsız olan mikro ve iç çatlaklar malzemenin yapısal bütünlüğünü zayıflatmaktadır. Geleneksel onarım teknikleri bu tür kusurları gidermede yetersiz kalmakta, bu durum kendini onaran malzemeler gibi onarım mekanizmalarına sahip çözümlerin geliştirilmesini zorunlu kılmaktadır. Bu ileri düzey malzemeler, mikro çatlakları erken aşamada doldurarak çatlak yayılımını otomatik olarak engellemekte ve böylece kaplanmış yapıların hizmet ömrünü uzatırken bakım ve korozyon maliyetlerini önemli ölçüde azaltmaktadır. Bu çalışmada, Pickering emülsiyon yöntemiyle üretilen grafen oksit (GO) içeren keten tohumu yağlı (LO) mikrokapsüllerin çelik malzeme yüzeyine kaplanması esas alınmıştır. İyileştirici kimyasalın kapsüllendiği termal gravimetrik analiz/diferansiyel termal analiz (TGA/DTA) ile, manuel olarak oluşturulan çiziklerin kendi kendini iyileştirme süreci taramalı elektron mikroskobu (SEM) ve optik mikroskop ile incelenmiştir. Kaplanmış numunelerin korozyon direnci elektrokimyasal korozyon testi (EIS) ile tespit edilmiştir. Başarılı bir şekilde üretilen mikrokapsüller ile yapılan kaplamaların kendi kendini iyileştirdiği gözlemlenmiştir.

Anahtar Kelimeler

• Mikrokapsül
• Kendini İyileştiren Kaplama
• Epoksi Kaplama
• Pickering emülsiyon

Development and characterization of self-healing coatings on metallic materials

Öz

In protective coatings applied to material surfaces, damage and crack formation are inevitable due to mechanical stress, thermal fluctuation and chemical degradation. Often difficult to detect and almost impossible to repair, micro and internal cracks weaken the structural integrity of the material. Traditional repair techniques are inadequate to eliminate such defects, which has necessitated the development of solutions with repair mechanisms such as self-healing materials. These advanced materials automatically prevent crack propagation by filling micro cracks at an early stage, thus extending the service life of coated structures and significantly reducing maintenance and corrosion costs. In this study, the coating of linseed oil (LO) microcapsules containing graphene oxide (GO) produced by the Pickering emulsion method is based on the steel material surface. The self-healing process of manually created scratches was examined with scanning electron microscope (SEM) and optical microscope by thermal analysis/ differential thermal gravimetric analysis (TGA/DTA) where the healing chemical was encapsulated. The corrosion resistance of the coated samples was determined by electrochemical corrosion test (EIS). It was observed that the coatings made with successfully produced microcapsules were self-healing.

Anahtar Kelimeler

• Microcapcule
• Self-Healing Coating
• Epoxy coating
• Pickering emulsion

Kaynakça

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