GFRC Cephe Sistemlerinde St37 Çelik Kancalar Üzerinde Santrifüjlü Sıcak Daldırma Galvaniz Kaplamaların (SHDG) Korozyon Performansı ve Korunumu: Bir Vaka Çalışması

Öz

St37 çelik kancalar, cam elyaf takviyeli beton (GFRC) panelleri binaların yüzeyine tutturmak için kullanılmaktadır. Kancaların yüzeyinde oluşan korozyon ürünleri çevredeki betonda çekme gerilmelerine neden olarak çatlamalara yol açmakta ve kancaların yük taşıma kapasitesini potansiyel olarak azaltmaktadır. Bu nedenle, bu kancaları korozyondan korumak çok önemlidir. Santrifüj sıcak daldırma galvanizleme (SHDG), özellikle dış mekan uygulamalarında kullanılan küçük metal parçaların korunması için tercih edilen bir işlemdir. Bu çalışma, GFRC panellerin montajında kullanılan kancalar üzerinde SHDG kaplamanın koruma etkisini araştırmayı amaçlayan ilk çalışmadır. GFRC panel kancaları, montaj işlemi sırasında genellikle üç farklı konfigürasyonda kullanılmaktadır. Bunu değerlendirmek için en yaygın üç kanca düzeneği test edilmiştir: monte edilmemiş (A), GFRC'ye gömülü kancalar (PD) ve sıcak daldırma galvanizli profil ile monte edilmiş (KT). Kancalar ASTM B117 standartlarına göre 23±2°C sıcaklık ve %50±5 bağıl nemde 96 saat boyunca bekletilmiş ve sonuçlar tartışılmıştır. Tuz püskürtme testinden önce ve sonra CHDG ile kaplanmış St37 çelik kancanın kesit morfolojileri taramalı elektron mikroskobu (SEM) ve enerji dağılımlı X-ışını spektrometresi (EDS) kullanılarak incelenmiştir. Test sonuçları, tüm test numunelerinde kırmızı pas bulunmadığını göstererek SHDG kaplamanın kancaları korozyondan koruduğunu ortaya koymuştur. Oluşan ZnO tabakası kaplama kusurlarının onarılmasına olanak tanır ve kaplamaların agresif iyonların nüfuzuna karşı fiziksel olarak korunmasını sağlamaktadır.

Anahtar Kelimeler

• Korozyon direnci
• Santrifüjlü sıcak daldırma galvaniz
• St37 çelik
• Kanca
• GFRC

Corrosion Performance and Protection of Centrifuged Hot-Dip Galvanized Coatings (CHDG) on St37 Steel Hooks in GFRC Façade Systems: A Case Study

Öz

St37 steel hooks are used to attach glass fiber-reinforced concrete (GFRC) panels to the surface of buildings. The corrosion products formed on the surface of the hooks cause tensile stresses in the surrounding concrete, resulting in cracking and potentially decreasing the load-carrying capacity of the hooks. It is, therefore, essential to protect these hooks from corrosion. Centrifugal hot-dip galvanizing (CHDG) is the preferred process, particularly for protecting small metal parts used in outdoor applications. This study is the first one aiming to investigate the protection effect of the CHDG coating on hooks used in the assembly of GFRC panels. GFRC panel hooks are often used in three different configurations during the assembly process. To evaluate this, the three most common hook assemblies were tested: unmounted (A), hooks embedded in GFRC (PD), and mounted with the hot-dip galvanized profile (KT). These were investigated for 96 hours at 23±2°C temperature and 50±5% relative humidity according to ASTM B117 standards, and the results are discussed. The cross-sectional morphologies of the St37 steel hook coated with CHDG before and after the salt spray test were examined using a scanning electron microscope (SEM) and energy-dispersive X-ray spectrometry (EDS). The test results show the absence of red rust in all the test specimens, indicating that the CHDG coating protects the tested hooks from corrosion. The formed ZnO layer allows the repair of coating defects and provides physical protection of the coatings against the penetration of aggressive ions.

Anahtar Kelimeler

• Corrosion resistance
• Centrifuged hot-dip galvanization
• St37 steel
• Hook
• GFRC

Kaynakça

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