Çelikler için Yüksek Korozyon Dayanımına Sahip Vanadyum Nitrür Kaplamalar

Abstract

Düşük korozyon dayanımı, alaşımlı çeliklerinden üretilmiş parçaların kullanım ömrünü sınırlamaktadır. Bu çalışmada Vanadyum nitrür (VN), termo reaktif biriktirmeyle AISI 4140 çeliği yüzeyine başarılı bir şekilde kaplanmıştır. Kaplamanın mikroyapısal, kimyasal ve korozyon özellikleri detaylı bir şekilde incelenmiş ve AISI 4140 çeliğinin özellikleriyle kıyaslanmıştır. Taramalı elektron mikroskobu (SEM) incelemeleri kaplanmış numunenin; VN tabakası, nitrürleme bölgesi ve altlık malzeme bölgesi olmak üzere üç bölgeden oluştuğunu göstermiştir. 1000 °C sıcaklık ve 2 saat kaplama parametreleri için kaplama kalınlığı yaklaşık 5.69 µm’dir. Enerji dağılımlı X-ışını spektroskopisi (EDS) analizlerine göre kaplama tabakasının yapısı Vanadyum ve Azot elementlerini içermektedir. X-ışınları difraksiyon (XRD) analizine göre kaplama VN bileşiğinden oluşmaktadır. Tafel ekstrapolasyonuna göre VN kaplamanın korozyon potansiyeli (Ekor)-0,604 V ölçülmüş olup,-0,717 V olan AISI 4140 çeliğinin Ekor değerine göre önemli miktarda yüksektir. Elektrokimyasal empedans spektroskopisine (EIS) göre kaplama çözünmesi 0.5 M NaCl sulu çözelti ortamındaki korozyonu yük kontrollüdür. Nyquist eğrileri kıyaslandığında VN kaplamanın korozyon dayanımı AISI 4140 çeliğininkinden daha yüksektir. Sonuçlara göre VN kaplamalar AISI 4140 çeliğinin çamur tahliyesinde kullanılan pompalar, kâğıt kesme makineleri ve zirai aletler gibi korozif ortamlarda kullanımı için ömrü artışı sağlayabilecek özelliktedir.

Keywords

• Vanadyum Nitrür Kaplamalar
• Termo Reaktif Biriktirme
• AISI 4140 Çeliği
• Korozyon

Vanadium Nitride Coatings with High Corrosion Resistance for Steels

Abstract

Low corrosion resistance limits the service life of parts made of alloy steels. In this study, Vanadium nitride (VN) was successfully coated on the surface of AISI 4140 steel by thermo-reactive deposition. The microstructural, chemical, and corrosion properties of the coating were studied in detail and compared with those of AISI 4140 steel. Scanning electron microscopy (SEM) examinations showed that the coated sample consists of three regions: the VN layer, the nitriding region, and the substrate material region. For 1000 °C temperature and 2 h coating parameters, the layer thickness is 5.69 µm. X-ray diffraction (XRD) analysis show that the coating consists of VN compound. According to Tafel extrapolation, the corrosion potential (Ecorr) of the VN coating was measured -0.604 V, which is significantly higher than that of AISI 4140 steel, which is -0.717 V. According to electrochemical impedance spectroscopy (EIS), coating corrodes under charge-controlled in 0.5 M NaCl aqueous solution. When Nyquist curves are compared, the corrosion resistance of VN coating is higher than that of AISI 4140 steel. According to the results, VN coatings can increase the life of AISI 4140 steel for use in corrosive environments, such as pumps used in sludge discharge, paper cutting machines, and agricultural tools.

Keywords

• Vanadium Nitride Coatings
• Thermo Reactive Deposition
• AISI 4140 Steel
• Corrosion

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