Abstract
Electrodeposition of nanocrystals is economically and technologically viable production path for the synthesis of pure metals and alloys both in coatings and bulk form. The study presents nanocrystalline Ni-Co alloy synthesis by high speed electrodeposition. Nanocrystalline Ni-Co alloys coatings were prepared by direct current (DC) and deposited directly on steel and aluminum substrates without any pretreatment, using high speed electrodeposition method. The influence of the electrolysis parameters, such as cathodic current density and temperature at constant pH, on electrodeposition and microstructure of Ni-Co alloys were examined. A homogeneous surface morphology was obtained at all current densities of the plated samples, and it was evident that the current density and temperature affect the coating thickness of Ni-Co alloy coatings.
Highlights
Nanocrystalline Ni-Co alloy synthesis has gained tremendous attention of researchers in recent time
Surface morphology, chemical composition, microstructure, and the thickness of the coating were characterized with optical microscopy and SEM with Energy Dispersive Using X-Ray (EDX)
Optical microscopy was used for characterization of the microstructure of the substrates and measurement of the coating thickness to understand the effects of temperature and current density
Summary
Nanocrystalline Ni-Co alloy synthesis has gained tremendous attention of researchers in recent time. Electrodeposition is an electrochemical liquid phase thin film or powder preparation method where the reactions, either reduction or oxidation, are accomplished using an external current source It is a low temperature processing route to produce nanostructured materials, most often in a single step requiring no secondary consolidation. The use of conventional electrodeposition techniques during synthesis of materials has been limited in its wide range practical applications because of its low deposition rate, which results in less nucleation of grains on the substrates This affects the surface morphology, microstructure, and the coating orientation. To overcome this concern, high speed jet electrodeposition was used in synthesis of nanocrystalline Ni-Co alloy, which will produce massive grain nucleation on the substrate because of enhanced flow rate characteristics
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