pH ve Akım Yoğunluğunun Kobalt-Tungsten Kaplamalarının Mikroyapı ve Sertliğine Etkileri

Year 2022, , 69 - 77, 14.04.2022

Kürşad Oğuz Oskay

https://doi.org/10.54365/adyumbd.1007722

Abstract

Bu çalışmada, bakır altlık malzemeler kullanılarak kobalt tungsten kaplamalar üretilmiştir. Sitrat-borat banyosu kullanılarak yapılan çalışmalarda, nanokristalin ve amorf kobalt-tungsten kaplamalar üretilmiştir. Kaplamaların karakterizasyonu için taramalı elektron mikroskobu (SEM), X-ışını floresansı (XRF) ve X-ışını kırınımı (XRD) cihazları kullanılmıştır. pH ve akım yoğunluğunun, kaplama morfolojisine, tungsten bileşimine ve mikrosertlik değerine etkileri incelenmiştir. Çalışmalar sırasında proses değişkenleri değiştirilerek üretilen numunelerin tungsten içeriği %11 ile 46 arasında değişmiştir. Deneylerde en yüksek sertlik değeri olarak 570 HV ölçülmüştür. Elektrolit pH’ı 6 olarak seçilen bu deneyde uygulanan akım yoğunluğu ise 5A/dm2’dir. Kaplamaların tungsten içeriğinin %35’i geçmesi ile kaplamaların sertliklerinde düşüş gözlemlenmiştir. Cevap yüzey yöntemi kullanılarak kaplamanın mikrosertlik değeri ve tungsten bileşimini tahmin edebilecek matematiksel modeller oluşturulmuştur

Keywords

kobalt, tungsten, elektrokaplama

Supporting Institution

Sivas Cumhuriyet Üniversitesi Bilimsel Araştırma Projeleri (CÜBAP)

Project Number

M-788

Effects of pH and Current Density on Microstructure and Hardness of the Cobalt-Tungsten Coating.

Abstract

In this study, cobalt-tungsten coatings were electrodeposited on copper substrates. Nanocrystalline and amorphous cobalt tungsten alloys were electrodeposited from citrate-boric acid baths. The characterization of the alloy coatings was carried out by scanning electron microscopy (SEM), X-ray fluorescence (XRF), and X-ray diffraction (XRD). The most significant factors, such as current density and pH of the electrolyte that affect the morphology, tungsten composition, and microhardness value, were studied. The tungsten content of the electrodeposits varied 11 to 46% by changing process variables. The microhardness value of the coatings was decreased dramatically when the tungsten composition exceeded 35%. Response surface methodology was used to construct models for predicting microhardness value and tungsten composition of the coating. The optimal conditions for the electrodeposition were found as follows: current density of 5A/dm2 and pH 6. Under optimal conditions, the coating exhibits a hardness of 570 HV.

Keywords

cobalt, tungsten, electrodeposition

Project Number

M-788

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