Effect of Deposition Time on Hardness and Corrosion Properties of Electroless Nickel-Boron Coatings

Year 2022, Issue: 40, 88 - 93, 30.09.2022

Yaren Sarp , İbrahim Usta , Sezer Tan , Hasan Algül , Mehmet Uysal , Ahmet Alp

https://doi.org/10.31590/ejosat.1173924

Abstract

Electroless nickel-based coatings are an excellent method to improve the surface properties of materials such as wear, hardness and corrosion. On the other hand, aluminum alloys are used in many applications" due to their properties such as cheapness and lightness. In addition to these good properties of aluminum alloys, their poor surface properties are limited in some usage areas in the industry. In this study, electroless nickel-boron (Ni-B) coatings were applied to the aluminum surface to improve the surface properties of the aluminum alloys (6xxxx). In this study, the effect of deposition time (30, 60, 90 min.) on the hardness and corrosion properties of Ni-B coatings was investigated. Scanning electron microscopy (SEM) was used to study the surface morphology, and X-ray diffractometry (XRD) was used to examine the phase structure. According to the SEM analysis results, it was observed as a result of the studies that the morphology of the Ni-B coating changed from nodular structure to cauliflower-like structure with increasing deposition time. Also, the thickness of the coatings is increased with an increase in the deposition time. According to the study's results, although the highest average hardness value is obtained as 1140 Hv by the highest deposition time of 90 min, the highest corrosion resistance is obtained as 1.969x10-3 mpy by the lowest deposition time of 30 min.

Keywords

Nickel-Boron, Hardness, Corrosion, Microstructure

Supporting Institution

Sakarya University

Project Number

5414

Thanks

We would like to thank Sakarya University, Metallurgical and Materials Engineering Department for providing the opportunity to carry out our study. We thank Sakarya University Scientific Research Projects Unit for their support to the project numbered 2018-1-6-37. We would like to thank TUBITAK for their support to the project numbered 116M998.

Biriktirme Süresinin Akımsız Nikel-Bor Kaplamaların Sertlik ve Korozyon Özelliklerine Etkisi

Abstract

Akımsız nikel esaslı kaplamalar, malzemelerin aşınma, sertlik ve korozyon gibi yüzey özelliklerini iyileştirmek için mükemmel bir yöntemdir. Alüminyum alaşımları ise ucuzluk ve hafiflik gibi özelliklerinden dolayı birçok uygulamada kullanılmaktadır. Alüminyum alaşımlarının bu iyi özelliklerinin yanında, düşük yüzey özellikleri endüstrideki bazı kullanım alanlarını sınırlar. Bu çalışmada, alüminyum alaşımlarının (6xxxx) yüzey özelliklerini iyileştirmek için alüminyum yüzeye akımsız nikel-bor (Ni-B) kaplamalar uygulanmıştır. Kaplama süresinin (30, 60, 90 dk.) Ni-B kaplamaların sertlik ve korozyon özellikleri araştırıldı. Yüzey morfolojisini incelemek için taramalı elektron mikroskobu (SEM) ve faz yapısını incelemek için X-ışını difraktometrisi (XRD) kullanıldı. SEM analiz sonuçlarına göre, Ni-B kaplamanın morfolojisinin artan kaplama süresi ile nodüler yapıdan karnabahar benzeri yapıya dönüştüğü deneysel çalışmalar sonucunda gözlemlenmiştir. Kaplamadaki, en yüksek sertlik değeri 90 dakikalık en yüksek biriktirme süresi ile 1140 Hv olarak elde edilmesine rağmen, en yüksek korozyon direnci 30 dakikalık en düşük biriktirme süresi ile 1.969x10-3 mpy olarak elde edilmiştir.

Keywords

Nikel-Bor, Sertlik, Korozyon, Mikroyapı, Akımsız Kaplama

Project Number

5414

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