Novel Electrodeposited Ni-B/Y2O3 Composite Coatings with Improved Properties

Rana Shakoor,Anwarul Hasan,Kamran Ali,Moinuddin Yusuf,Ramazan Kahraman,Anton Popelka,Umesh Waware

doi:10.3390/coatings7100161

Abstract

Ni-B/Y2O3 composite coatings were developed through an electrodeposition process to study the effect of addition of Y2O3 particles on structure, surface, thermal, mechanical, and anticorrosion properties of Ni-B coatings. It is revealed that parent crystal structure of Ni-B matrix is preserved by addition of Y2O3, however, a noticeable improvement in crystallinity is observed. The analysis of the surface exhibits formation of dense and nodular deposits in the two types of coatings, but incorporation of Y2O3 particles in Ni-B matrix has resulted in a noteworthy change in grain size and surface roughness. Thermal analysis of the surfaces indicates that Ni-B-Y2O3 composite coatings demonstrate superior thermal stability compared to Ni-B coatings. The nanoindentation analysis shows a significant enhancement in the mechanical characteristics of the Ni-B matrix by addition of Y2O3 particles. This may be contemplated as the result of grain refinement and dispersion hardening of the Ni-B matrix by the presence of hard Y2O3 particles. A decent improvement in the corrosion protection efficiency (73.6%) is also observed by addition of Y2O3 particles into Ni-B matrix. Simultaneous improvement of mechanical and anticorrosion properties suggests potential applications of Ni-B-Y2O3 coatings in oil and gas, automobile, and many other industries.

Highlights

Wear and corrosion usually act together leading to significant damage in various industrial applications such as chemical and mineral processes, mining, pulp/paper, and the energy industry [1].Material damage control by surface protection techniques by applying coatings of some suitable materials has proven to be effective [2]
Ni-B coatings are famous for their excellent wear resistance and high hardness coupled with decent characteristics like durability, uniformity of layer thickness, lubricity and ductility, exceptional solderability, decent electrical characteristics, antimicrobial properties, low porosity, excellent bonding, electromagnetic
Ni-B-Y2 O3 composite coatings have been presented in Figure 1a, whereas the small scale scan with 2θ range (40◦ –60◦ ) is presented in Figure 1b for a clear comparison

Summary

Introduction

Wear and corrosion usually act together leading to significant damage in various industrial applications such as chemical and mineral processes, mining, pulp/paper, and the energy industry [1].Material damage control by surface protection techniques by applying coatings of some suitable materials has proven to be effective [2]. Among various types of coatings, composite coatings have attracted attention due to their decent merits such as protection against corrosion, wear, and improved microhardness relative to pure metallic or alloy coatings. Aqueous metal deposition techniques like electroless plating or electro-deposition have gained considerable attentiveness because of their impressive superiority such as simpler operation, low cost, high deposition rate, uniformly deposited layers, and good wear and corrosion properties [3,4]. [5,6] Due to these attractive characteristics, Ni-B coatings have found multiple uses in automotive, aeronautics, nuclear, astronautics, petrochemical, electronic devices, plastics, optics, textile, paper/pulp, food, and print industries [7,8,9]

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Conclusion