Influence of Y2O3 nanoparticles on microstructures and properties of electrodeposited Ni–W–Y2O3 nanocrystalline coatings. (November 2020)

• Record Type: Journal Article
• Authors: Xing, Shilong; Wang, Lianbo; Jiang, Chuanhai; Liu, Huabing; Zhu, Wenlong; Ji, Vincent
• Is Part Of: Vacuum. Volume 181(2020)
• Publication Date: 2020-11
• Subjects: Ni–W composite coating -- Y2O3 nanoparticle -- Microstructure -- Corrosion resistance; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109665
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: In this study, Ni–W nanocrystalline alloy coatings incorporated with different amounts of Y2 O3 nanoparticles (0–20 g/L in the electrolyte) were successfully synthesized via direct current electrodeposition method at an applied current density of 2 A/dm 2 . The microstructure, morphology, chemical composition, microhardness and electrochemical performance of the deposited coatings were comprehensively investigated to unveil the fundamental effects of the Y2 O3 addition. Results indicate that Y2 O3 nanoparticles were uniformly incorporated in the composite coatings. The incorporated Y2 O3 nanoparticles contributed to a compact and smooth coating surface. The microstructures of the deposited coatings that determined from the broadening of X-ray diffraction peaks proved that the addition of nanoparticle resulted in microstructure refinements, and the composite coating deposited from an electrolyte containing 10 g/L Y2 O3 nanoparticles showed the smallest crystallite size 15.5 nm and the largest microstrain 0.59%. The microhardness increased from 533 to 789 HV as the concentration of Y2 O3 particles in the electrolyte increased from 0 to 20 g/L. Furthermore, the corrosion resistance of the composite coatings improved due to the incorporation of Y2 O3 nanoparticles and the composite coating electrodeposited from an electrolyte containing 10 g/L Y2 O3 nanoparticles exhibited the highest anti-corrosion performance. Highlights: Ni–W–Y2 O3 nanocrystalline coatings were successfully fabricated by direct current electrodeposition. Y2 O3 nanoparticles were uniformly distributed in the volume of the composite coatings. Grain refinement and optimized surface properties were obtained by incorporating Y2 O3 nanoparticles. Hardness and corrosion resistance of Ni–W–Y2 O3 coatings were significantly enhanced.