Effect of Pulse and Direct Current Electrodeposition on Microstructure, Surface, and Scratch Resistance Properties of Ni
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Effect of Pulse and Direct Current Electrodeposition on Microstructure, Surface, and Scratch Resistance Properties of Ni–W Alloy and Ni–W–SiC Composite Coatings Sami Bin Humam1 · Gobinda Gyawali2 · Dhani Ram Dhakal1 · Jin‑Hyuk Choi1 · Soo Wohn Lee1 Received: 10 April 2020 / Revised: 11 May 2020 / Accepted: 27 May 2020 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The present work aims to study the influence of direct current and pulse current techniques as well as embedded SiC nanoparticles on the mechanical properties of the electrodeposited Ni–W coating. The electrodeposited coatings were studied for morphological, microstructural, mechanical, and scratch resistance properties using the surface roughness tester, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Vickers microhardness, and scratch tester. Application of pulse current exhibited relatively homogeneous and smooth surface of the coatings. A remarkable increment of microhardness was observed in both Ni–W and Ni–W–SiC coatings prepared under pulse current as compared to the direct current technique. Similarly, the scratch test revealed a considerable improvement in the scratch resistance behavior of the Ni–W alloy and the composite coatings from the pulsed current condition. Hence, the application of pulse current not only improved the surface- and microstructure-related properties but also enhanced the Vickers microhardness and scratch resistance properties of the coatings. In addition, the reduction in micro-cracks revealed the improvement in scratch resistance properties of the coatings due to the incorporated SiC nanoparticles into the Ni–W alloy matrix. Keywords Ni–W–SiC composite · Surface · Microstructure · Microhardness · Scratch resistance
1 Introduction Electrodeposition of metal-based composites containing embedded inert particles has been extensively studied since Fink and Prince [1] first investigated the graphite codeposition into the Cu matrix. Metal matrix composites (MMCs) have received widespread attention among the scientific community due to their outstanding mechanical, tribological, electrical, thermal, and corrosion resistance properties [2] for the development of multifunctional composite coatings. Available online at http://link.springer.com/journal/40195. * Gobinda Gyawali [email protected] * Soo Wohn Lee [email protected] 1
Department of Environmental and Bio‑Chemical Engineering, Sun Moon University, Asan 31460, Korea
Department of Fusion Science and Technology, Sun Moon University, Asan 31460, Korea
2
Among commonly investigated of metal–matrix system, Ni–W alloys are of considerable interest due to their unique characteristic features such as good chemical and thermal stability, high hardness, high wear resistance at elevated temperatures, high melting point, low coefficient of thermal expansion, high tensile strength, and high corrosion resistance in extreme conditions [3–5]. Although hard chrome (HCr
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