Abstract
Ni–W/Cr2O3 nanocomposite coatings were synthesized from aqueous sulphate-citrate electrolyte containing Cr2O3 nanoparticles on a steel surface using conventional electrodeposition technique. This study was aimed at investigating the influence of Cr2O3 nanoparticle content on the microstructure, corrosion resistance, and mechanical properties of electrodeposited Ni–W/Cr2O3 nanocomposite coatings. Ni–W binary alloy coatings were deposited and optimized before addition of the nanoparticles to produce high-quality coatings. The microstructure and chemical composition of the Ni–W/Cr2O3 nanocomposite coatings were evaluated using scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), and XRD. Corrosion resistance properties were evaluated using potentiodynamic polarization (Tafel) measurements in 3.5 wt.% NaCl medium. The corrosion resistance and microhardness are significantly higher in Ni–W/Cr2O3 nanocomposite coatings compared to pure Ni–W binary alloy and increase with the increase in content of Cr2O3 nanoparticles in the coatings. Wear resistance is also higher in Ni–W/Cr2O3 nanocomposite coatings.
Highlights
Material surfaces form one of the key pillars in engineering
This study is aimed at investigating the wear resistance of Ni–W/Cr2 O3 nanocomposite coatings as well as the effect of varying electrodeposition parameters on the microstructure and corrosion characteristics of electrodeposited Ni–W nanocrystalline coatings reinforced with Cr2 O3 nanoparticles using conventional electro-deposition (CECD) technique
The present study focuses on the effect of electrodeposition conditions on the electrodeposited Ni–W/Cr2 O3 nanocomposite coatings in order to determine the optimum fabrication conditions
Summary
Material surfaces form one of the key pillars in engineering. surfaces are under constant threat of corrosion and wear, which increases maintenance costs and decreases operating efficiency in industry. Metal matrix composites (MMCs) are comprised of matrices whose phases are made up of either metal or metal alloy and reinforcements, which can range from carbide, nitride, ceramic, oxide, to metallic particles Such MMCs find wide use in automobile and aerospace industries owing to their excellent isotropic, physical, and chemical properties [2]. These alloy coatings exhibit superior corrosion and wear resistance, the constant need for better materials has led researchers to embed various nanoparticles in the Ni–W alloy matrix as the reinforcement. The electrodeposited Ni–W nanocomposite coatings have been found to exhibit far superior resistance to corrosion and wear compared to purely Ni–W binary alloys. This study is aimed at investigating the wear resistance of Ni–W/Cr2 O3 nanocomposite coatings as well as the effect of varying electrodeposition parameters on the microstructure and corrosion characteristics of electrodeposited Ni–W nanocrystalline coatings reinforced with Cr2 O3 nanoparticles using conventional electro-deposition (CECD) technique. The mechanical and microstructural characteristics on electrodeposited Ni–W/Cr2 O3 from the subsequent fabrication conditions were analysed
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