Hekzagonal bor nitrür takviyeli akımsız nikel kaplamanın özelliklerine ısıl işlemin etkisi

Year 2019, Volume: 4 Issue: 3, 119 - 127, 30.09.2019

Mustafa KOCABAŞ Halil YILMAZ Nurhan CANSEVER

https://doi.org/10.30728/boron.578022

Abstract

Bu çalışmada, 1050 alüminyum alaşım yüzeyine hekzagonal bor nitrür
(h-BN) ilaveli akımsız nikel-fosfor (Ni-P) kompozit kaplama uygulanmış ve
400°C’de 1 saat süreyle yapılan ısıl işlemin kaplama yapısına etkisi
incelenmiştir. Kompozit kaplamalar, üç farklı miktarda (1, 5 ve 10 g/L) h-BN içeren
çözeltide yapılmıştır. Kaplamalara, Taramalı Elektron Mikroskobu (SEM), X-ışını
spektroskopisi (EDS), X-ışını kırınımı (XRD) analizleri yapılmıştır. Bunlara
ilaveten yüzey pürüzlülükleri, sertlikleri ölçülmüş ve %3,5 sodyum klorür (NaCl)
çözeltisi içinde elektrokimyasal korozyon deneyleri yapılmıştır. Amorf yapıdaki
nikel matrisin ısıl işlem ile kristalin yapıya dönüştüğü tespit edilmiştir.
Isıl işlem sonucu sertlik değerleri artmış ve en yüksek sertlik değerine (1015 ±
41 HV_0,05), 10
g/L h-BN içerikli çözeltide yapılan kaplamada ulaşılmıştır. Elektrokimyasal
deneylerde ise ısıl işlemin kompozit kaplamaların korozyon direncini azalttığı
belirlenmiştir. 

Keywords

1050 alüminyum alaşımı, Akımsız nikel kompozit kaplama, h-BN, Isıl işlem, Korozyon

Heat treatment effect of hexagonal boron nitride reinforced electroless nickel coatings

Abstract

In this study, surfaces of 1050 aluminium alloy
were coated with hexagonal boron nitride (h-BN) reinforced electroless nickel-phosphorus
(Ni-P) composite coating and the effect of heat treatment on the coating
structure for 1 hour at 400°C was investigated. Composite coatings were performed
in solutions which consist of three different compositions (1, 5 and 10 g/L) of
h-BN. A scanning electron microscope (SEM), X-ray spectroscopy (EDS) and X-ray
diffraction (XRD) analysis were
performed on the composite coatings. Additionally, surface roughness and
hardness were measured and finally, electrochemical corrosion experiments were
conducted in 3.5% sodium chloride (NaCl) solution. The heat treatment process
has identified a transition from amorphous structure to crystalline in the
nickel matrix. The result of heat treatment, hardness values increased and the
highest value of hardness (1015 ± 41 HV_0.05)
was achieved with the specimen coated in 10 g/L h-BN solution. In the
electrochemical experiments, a reduction in corrosion resistance of the
composite coatings was determined the result of heat treatment. 

Keywords

1050 aluminium alloy, Electroless nickel composite coating, Corrosion, h-BN, Heat treatment.

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