Nikel-Kobalt (Ni-Co) Alaşımlı Kaplamalarda Co Miktarının Mikroyapıya Etkisi

Yıl 2019, Cilt: 9 Sayı: 2, 284 - 289, 15.04.2019

Tuncay Dikici

https://doi.org/10.17714/gumusfenbil.431325

Öz

Bu çalışmada, Ni-Co alaşımlı
kaplamalar elektrolitik yöntemle çelik malzeme yüzeyine sülfat banyosundan bir
güç kaynağı yardımıyla hazırlanmıştır. Elektrolit içinde Co miktarındaki
değişimin kaplamanın kompozisyon, faz yapısı ve morfoloji üzerine etkileri
incelenmiştir. Elde edilen kaplamalar; X‑ışını kırınım cihazı (XRD) ve taramalı
elektron mikroskobu (SEM) ile karakterize edilmişlerdir. Sonuçlara göre,
elektrolit içindeki farklı Co konsantrasyonu Ni-Co alaşımlı kaplama tabakasının
özelliklerine etki etmektedir. Elektrolitteki Co oranının artışı ile birlikte
alaşımlı kaplama tabakasında depozitlenen Co oranında ciddi bir artış söz
konusudur. Ni-Co alaşımlı kaplama tabakasında YMK+HSP kristal yapısı artan Co
miktarı ile HSP yapıya dönüşmektedir. Aynı zamanda alaşımlı kaplama tabakasındaki
Co oranındaki artış ile birlikte yüzey morfolojisinde değişim gözlemlenmiştir
ve daha granüler bir yapı oluşmuştur.

Anahtar Kelimeler

Elektrolit, Ni-Co alaşımı, XRD, Yüzey morfolojisi

The Effect of Co Content on The Microstructure of Nickel-Cobalt (Ni-Co) Alloy Coatings

Öz

In this study, Ni-Co
alloy coatings were prepared on the steel substrates with electrodeposition method
from a sulphate baths using power supply. The effect of Co content in
electrolyte on the composition, phase structure and surface morphology of alloy
coating were investigated. The prepared coatings were characterized using X-ray
diffraction (XRD) and scanning electron microscope (SEM). According to the
results, Co concentration in the electrolyte affects the properties of the
Ni-Co alloy coating layer. There is a serious increase of Co content deposited
Ni-Co alloy coating when the Co concentration is increased in the electrolyte. The
both FCC and HCP crystal structures of Ni-Co alloy coating layer began to
transformin into HCP structure with increasing amount of Co content. At the
same time, a change in the surface morphology was observed with an increase in
Co ratio in the alloy coating layer and a more granular structure was formed.

Anahtar Kelimeler

Electrolyte, Ni-Co alloy, XRD, Surface morphology

Kaynakça

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