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.

Hekzagonal bor nitrür takviyeli akımsız nikel kaplamanın özelliklerine ısıl işlemin etkisi

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

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