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Materials, Vol. 11, Pages 1124: Electrochemical Deposition and Nucleation/Growth Mechanism of Ni–Co–Y2O3 Multiple Coatings

Materials, Vol. 11, Pages 1124: Electrochemical Deposition and Nucleation/Growth Mechanism of Ni–Co–Y2O3 Multiple Coatings

Materials doi: 10.3390/ma11071124

Authors: Xinyu Zhou Yiyong Wang Zhipeng Liang Hui Jin

Ni–Co alloy and Ni–Co–Y2O3 multiple coatings refined with nano-Y2O3 particles were fabricated by ultrasonic-assisted electrochemical deposition in an acid sulfamate bath. Linear sweep voltammetry (LSV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) techniques were applied to investigate the nucleation/growth process of composite coatings in co-deposition. The LSV results indicated that the incorporation of nano-Y2O3 particles with the Ni–Co matrix shifted the initial deposition potential to a more positive potential and decreased cathodic polarization. For both coatings, the nucleation/growth process approximately agreed with the Scharifker–Hill instantaneous nucleation model. Nucleation parameters, including active nucleation sites (N0) and nucleation rate (A) of the composite, were higher when the measured potential range was between −1.05 V (vs. SCE) and −1.20 V vs. SCE, when compared with the Ni–Co alloy, and the observed AFM images of the coatings were in good agreement with the calculated nucleation parameters (using the Marquardt–Levenberg algorithm) of experimental curves. EIS testing indicated that the charge transfer resistance of the composite was lower in electrodeposition. The incorporation of nano-Y2O3 particles in the matrix changed the preferred orientation of coatings and produced a more uniform and compact deposit layer with finer grains.

Authors:   Zhou, Xinyu ; Wang, Yiyong ; Liang, Zhipeng ; Jin, Hui
Journal:   Materials
Volume:   11
edition:   7
Year:   2018
Pages:   1124
DOI:   10.3390/ma11071124
Publication date:   01-Jul-2018
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