Ferda MİNDİVAN, Kemal AYDIN, Harun MİNDİVAN

Elektrolitik Kaplanmış Nikel/Grafen Kompozit Kaplamaların Üretimi ve Karakterizasyonu

Nikel (Ni) ve grafen nano plaka (GNP) takviyeli Ni esaslı kaplamalar, Watts tipi kaplama banyosu kullanılarak doğru akım (DC) şartları altında hazırlanmıştır. Elektrolitik kaplama için altlık olarak St 37 çelik, yanal boyutu ~5 nm ve kalınlığı ~5-8 nm boyutlarında olan GNP tabakaları ise takviye malzemesi olarak kullanılmıştır. Elde edilen kaplamaların morfolojik, elementel ve faz değerlendirmeleri sırasıyla taramalı elektron mikroskobu (SEM), enerji dağılımlı x-ışınları spektrometre (EDS) ve X-ışını kırınım ölçer (XRD) ile gerçekleştirildi. Ayrıca hazırlanan kaplamaların sertlik ve aşınma davranışları incelenmiştir. Elektrolitik yöntemle hazırlanan 0,3 g/l GNP içeren kompozit kaplama daha düzgün istif yoğunluğuna ve daha kompakt bir yapıya sahiptir. Ni-GNP (0.3 g/l) kompozit kaplama, saf Ni kaplamaya kıyasla üstün sürtünme özellikleri sergilemiştir.

Anahtar Kelimeler:

Elektrolitik Kaplama, Nikel-Grafen, Morfoloji, Mikroyapı, Aşınma.

Production and Characterization of Electrodeposited Nickel/Graphene Composite Coatings

Nickel (Ni) - Graphene nanoplatelet (GNP) composite coating was prepared under direct current (DC) conditions by co-deposition of GNP particles and Ni from a Watts type bath. St 37 steel substrate was used for electrodeposition and GNP layers having a lateral dimension of ~5 nm and a thickness of ~5-8 nm were used as reinforcement. Morphological, elemental and phase evaluations were conducted on the deposited coatings by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), respectively. Furthermore, the hardness and wear behaviors of the prepared coatings were investigated. The results showed that the composite coating prepared by electrodeposition in a Ni plating bath containing 0.3 g/l GNP, exhibited a uniform and compact structure. Ni-GNP (0.3 g/l) composite coating showed superior frictional properties compared to pure Ni coating.

Keywords:

Electrodeposition, Nickel-Graphene, Morphology, Microstructure, Wear,

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