HVOF Yöntemiyle Kaplanan WC-Co-Cr Kaplamaların Sıcak Korozyon Davranışının Değerlendirilmesi

Termal püskürtme kaplama teknikleri, denizcilik, otomotiv, biyomedikal ve özellikle havacılık endüstrisi gibi çeşitli alanlarda geniş kapsamlı uygulamalara sahiptir. Bu yöntemler, termal püskürtme kaplamalarla kaplanmış malzemelerin, özellikle yüksek sıcaklıklarda oksidasyona, erozyona, korozyona ve aşındırıcı ortamlara karşı mükemmel direnç göstermesi nedeniyle yaygın olarak kullanılmaktadır. Bu çalışmada, modern bir termal püskürtme kaplama yöntemi olan yüksek hızlı oksi-yakıt (HVOF) tekniği kullanılarak, WC-Co-Cr içeren sert sermet seramik kaplama malzemesi, 316L paslanmaz çelik bir alt tabaka üzerine kaplanmıştır. Ayrıca, 1, 3 ve 5 saat boyunca 750°C'de %45 Na2SO4 ve %55 V2O5 sıcak korozyon tuzları varlığında izotermal sıcak korozyon testleri yapılmıştır. HVOF tekniği kullanılarak kaplanmış örnekler, X-ışını Difraktometrisi (XRD), Enerji Dispersiyon Spektrometresi (EDS), taramalı elektron mikroskopisi (SEM) ve elementel haritalama analiz cihazları gibi gelişmiş karakterizasyon teknikleri kullanılarak sıcak korozyon testleri öncesi ve sonrasında karakterize edilmiştir. Bulgular, yüksek aşınma direnci ile bilinen WC-Co-Cr sert kaplamaların yüksek sıcaklıklarda ciddi hasar gördüğünü göstermektedir. Kaplama, 750°C'de V2O5 ve Na2SO4 erimiş tuz varlığında yapılan 5 saatlik sıcak korozyon testlerinden sonra hasar görmüştür.

Anahtar Kelimeler:

WC-Co-Cr Sert Sermet Seramik Malzeme, Sıcak Korozyon, Yüksek Hızlı Oksi Yakıt (HVOF), Termal Sprey Kaplamalar

Evaluation of Hot Corrosion Behavior of WC-Co-Cr Coatings Coated by the HVOF Method

Thermal spray coating techniques have wide-ranging applications in various fields, including marine, automotive, biomedical, and aerospace industries. These methods are popularly used because materials coated with thermal spray coatings exhibit excellent resistance to oxidation, erosion, corrosion, and abrasive environments, particularly at high temperatures. The present study utilized the high-speed oxy-fuel (HVOF) technique, a state-of-the-art thermal spray coating method, to apply a hard cermet ceramic coating material consisting of WC-Co-Cr onto a 316L stainless steel substrate. Isothermal hot corrosion tests were also conducted at 750°C in the presence of 45% Na2SO4 and 55% V2O5 hot corrosion salts for 1, 3, and 5 hours. Advanced characterization techniques such as X-Ray Diffractometry (XRD), Energy Dispersive Spectrum (EDS), scanning electron microscopy (SEM), and elemental mapping analysis devices were used to characterize the samples coated with the HVOF technique before and after hot corrosion tests. The findings indicate that WC-Co-Cr hard coatings, which are known for their high resistance to abrasion, sustain severe damage at high temperatures. The coating was damaged after 5 hours in the hot corrosion tests performed in the presence of V2O5 and Na2SO4 molten salt at 750°C.

Keywords:

WC-Co-Cr Hard Cermet Ceramic Material, Hot Corrosion, High-Velocity Oxy-Fuel (HVOF), Thermal Spray Coatings,

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