Next Article in Journal
Therapeutic Contact Lenses with Polymeric Vehicles for Ocular Drug Delivery: A Review
Previous Article in Journal
Electrochemically Enhanced Drug Delivery Using Polypyrrole Films
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Materials 2018, 11(7), 1124; https://doi.org/10.3390/ma11071124

Electrochemical Deposition and Nucleation/Growth Mechanism of Ni–Co–Y2O3 Multiple Coatings

School of Materials & Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
*
Author to whom correspondence should be addressed.
Received: 4 June 2018 / Revised: 29 June 2018 / Accepted: 29 June 2018 / Published: 1 July 2018
Full-Text   |   PDF [7636 KB, uploaded 1 July 2018]   |  

Abstract

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. View Full-Text
Keywords: Ni–Co–Y2O3 composite; chronoamperometry; instantaneous nucleation; kinetic parameters Ni–Co–Y2O3 composite; chronoamperometry; instantaneous nucleation; kinetic parameters
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhou, X.; Wang, Y.; Liang, Z.; Jin, H. Electrochemical Deposition and Nucleation/Growth Mechanism of Ni–Co–Y2O3 Multiple Coatings. Materials 2018, 11, 1124.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top