Effect of Ultrasonic Nanocrystal Surface Modification on Properties of Electrodeposited Ni and Ni-SiC Composite Coatings
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JMEPEG (2017) 26:4462–4469 DOI: 10.1007/s11665-017-2891-4
Effect of Ultrasonic Nanocrystal Surface Modification on Properties of Electrodeposited Ni and Ni-SiC Composite Coatings Gobinda Gyawali, Bhupendra Joshi, Khagendra Tripathi, and Soo Wohn Lee (Submitted February 24, 2017; in revised form August 8, 2017; published online August 30, 2017) In this study, pure nickel and Ni-SiC composite coatings were prepared by the conventional electrodeposition technique from nickel sulfamate electrolytic bath containing dispersed SiC particles. The samples obtained after the electrodeposition were subjected to the ultrasonic nanocrystal surface modification (UNSM) technique to improve the surface- and interface-related properties of the coatings. The surface morphology, elemental composition, surface roughness, microstructure, and crystallinity were observed and analyzed by using scanning electron microscope, energy-dispersive x-ray spectroscopy, roughness tester, and x-ray diffraction techniques, respectively. Electrochemical corrosion behavior of the obtained samples was evaluated in 3.5 wt.% NaCl solution by using three electrodes configuration. XRD result revealed the enhanced crystallinity of the UNSM-treated samples. A significant improvement in surface morphology, Vickers microhardness, wear and coefficient of friction, and anti-corrosion property was observed in the UNSM-treated nickel and Ni-SiC coatings compared to the UNSM-untreated samples. Keywords
composites, corrosion, electron microscopy, inorganic coatings, metallic matrix, UNSM, wear
1. Introduction Metal matrix composites (MMCs) have drawn considerable attention in recent years due to their excellent mechanical, tribological, electrical, thermal, and electrochemical corrosion properties (Ref 1-6). Hence, these composite coatings can be widely applied in the mechanical components to reduce wear and friction between the counter components and the protective components to resist over electrochemical corrosion. Metal matrix composite coatings can be fabricated by several techniques such as liquid-phase processes, solid–liquid processes, deposition techniques, in situ process, and two-phase processes (Ref 7). The deposition technique comprises immersion plating, electroplating, spray deposition, chemical vapor deposition (CVD), physical vapor deposition, spray forming, etc. Out of these several deposition techniques, electroplating technique is a simple, cost-effective, and an easy way to fabricate the composite coatings. The second phase (organic or inorganic particles of nanosize to micron size), to be codeposited, is dispersed in the electrolytic bath during the electrodeposition process. Being an engineering metal, nickel-based composite coatings by the electrodeposition technique have been extensively studied in recent years (Ref 8-10). Reinforcement of a wide range of Gobinda Gyawali and Bhupendra Joshi, Division of Basic Engineering, Sun Moon University, Asan, South Korea; Khagendra Tripathi, Research Center for Eco Multi-Functional Nano Materials, Sun Moo
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