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Abstract
Electrodeposition of Ni-Co alloy foils on titanium substrate was performed in an acid chloride- sulphate bath. The influences of electrodeposition parameters such as current density, temperature, pH value, cobalt sulphate and saccharin concentration on composition and current efficiency were investigated in detail. The morphology and the microstructure of deposits were analyzed by SEM and XRD, respectively. The results indicated that the optimum parameters were current density 3-4 A/dm2, pH 2-3, temperature 40-50?C, cobalt sulphate 20 g/l and saccharin 2-3 g/l. Chemical analysis of the deposits by EDS revealed anomalous Ni-Co codeposition occured in this system. The SEM showed that hydroxide particles were not present on the surface and that fine-grain, smooth and compact Ni-Co alloy deposits were obtained. The crystallographic structures of Ni-Co alloy foils were the fcc Ni solid solution. The Ni-Co alloy foils with Co content 17.3-37.2 wt% and thickness of 20-45 μm were bright with low residual stress and super toughness.
Highlights
Ni-Co alloy foil exhibits many excellent properties such as corrosion resistance, ductility, brightness, good strength, hardness and stable beneficial magnetic properties
The influences of electrodeposition parameters such as current density, temperature, pH value, cobalt sulphate and saccharin concentration on composition and current efficiency were investigated in detail
The results indicated that the optimum parameters were current density 3 - 4 A/dm[2], pH 2 - 3, temperature 40 - 50 ̊C, cobalt sulphate 20 g/l and saccharin 2 - 3 g/l
Summary
Ni-Co alloy foil exhibits many excellent properties such as corrosion resistance, ductility, brightness, good strength, hardness and stable beneficial magnetic properties. Ni-Co alloy foils are typical magnetic materials applicable in several fields, such as soft-magnetic and giant-magneto-resistive (GMR) materials [1-3]. Ni-Co alloy foils can be fabricated in several methods such as smelting and electrodeposition. The method of electrodeposition is the simplest, most economical, reliable and reproducible technique. Experimental studies on the electrodeposition of Ni–Co alloy by DC current or pulse currents were carried out by a number of researchers [4-15]. The functional properties of electrodeposited Ni-Co alloy foil depend greatly on their composition, which should be strongly affected by deposition parameters. No complexing agent was used, Ni-Co alloy foils with a wide range of alloy composition are prepared by changing electrodeposition parameters.The influences of electroplating parameters on the compositions of Ni-Co alloy foils and the current efficiency were discussed
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