Yüksek Hızlı Oksi- Yakıt Püskürtme Tekniği ile Üretilmiş MCrAlY Esaslı Kaplamaların Sıcak Korozyon Davranışı

Yıl 2019, Cilt: 12 Sayı: 2, 1174 - 1188, 31.08.2019

Yılmaz Yalçın , Ramazan Tuncer , Muhammet Karabaş , Yusuf Kayalı

Öz

Bu çalışmada küresel grafitli
dökme demir (KGDD) altlıklar Yüksek Hızlı Oksi-Yakıt (HVOF) yöntemi ile Ni
esaslı AMDRY 9624 ve Ni-Co esaslı AMDRY 9951 olmak üzere iki farklı malzeme ile
kaplanmıştır. Kaplamaların mikroyapı ve faz analizleri enerji dağılımlı X-Ray
spektrometreli taramalı elektron mikroskobu (SEM-EDX) ve X ışınları
difraksiyonu (XRD) yöntemleri kullanılarak yapılmıştır. Bu kaplamaların, %50 V₂O₅
+ %50 Na₂SO₄ korozif tuz karışımından oluşan ortamda ve
üç farklı sıcaklıkta sıcak korozyon davranışları incelenmiştir. Karakterizasyon
çalışmaları neticesinde dökme demir altlıklar üzerinde yaklaşık 80 µm
kalınlığında yoğun, porozitesiz bir kaplama tabakası elde edildiği ve kaplama
ile altlık malzeme arasında sürekli yapışma sağlandığı görülmüştür. AMDRY 9624
ile kaplanan dökme demirlerin γ ve β intermetalik fazlarını ihtiva ettiği,
AMDRY 9951 ticari toz ile üretilen kaplamanın ise sadece γ fazını ihtiva ettiği
tespit edilmiştir. Sıcak korozyon testleri sonrasında dökme demir altlığın
korozyon tuzlarıyla reaksiyonu sonucu üç sıcaklıkta da FeVO₄
korozyon ürünü oluşmuştur. Kaplama uygulaması sonrası ise 500 ºC de tuzların
etkisi ile herhangi bir metal vanadat bileşiği oluşmazken, 600 ve 700 ºC
sıcaklıkta çeşitli metal vanadat korozyon ürünlerinin oluşumu belirlenmiştir. 

Anahtar Kelimeler

Sıcak Korozyon, HVOF, Kaplama

Hot Corrosion Behaviour of MCrAlY Based Coatings Fabricated by High Velocity Oxy-Fuel

Öz

In this study, ductile cast
irons (DCI) were coated with two different AMDRY 9624 Ni based and AMDRY 9951
Ni-Co based materials by HVOF method. Microstructure and phase analyzes of the
coatings were performed to by using Scaning electron microscopy equipped with
Energy-dispersive X-ray spectroscopy (SEM-EDX) and X-Ray difraction (XRD)
methods. Hot corrosion behavior of DCI are investigated by using %50 V₂O₅
+ %50 Na₂SO₄ salts. As a result of the characterization
studies it was observed that a dense non-porous coating layer of about 80 μm
thickness was obtained on the cast iron samples and continuous adhesion was
provided between the coating and the substrate. It has been determined that the
cast iron coated with AMDRY 9624 contains γ and β intermetallic phases and the
coating produced with AMDRY 9951 commercial powder containsonly γ phase. After
the hot corrosion tests, The characterization studies reveal that the reaction
of the cast iron substrate with corrosive salts resulted in the formation of
FeVO₄ corrosion product at all three temperatures. After coating
application, no metal vanadate compound was formed by the reaction of salts
with the coatings at 500 ºC. The formation of various metal vanadate corrosion
products at 600 and 700 ºC temperature was determined.

Anahtar Kelimeler

Hot corrosion, HVOF, Coating

Kaynakça

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