Preparation of Ni-Co Alloy Foils by Electrodeposition

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

Morphology and Electrochemical Characterization of Electrodeposited Nanocrystalline Ni-Co Electrodes for Methanol Fuel Cells

“…In agreement with Yang and Deng [44], the intensity of the main XRD peaks increases and the peak width is broader, indicating a decrease in grain size with higher Co content.…”

Electrochemical 3D printing of Ni–Mn and Ni–Co alloy with FluidFM

“…3(d)). The metal content of the pillars is similar to the typical electrodeposited thin films (from these salt solutions), in which the wt% proportion for Ni and Mn is typically more than 9 [32,33], and the wt% proportion for Ni and Co is approximately 1.5 ~ 4 [29,34]. To confirm the dense nature of the electrodeposits, cross-sections of the Ni-Mn and Ni-Co pillars were obtained using focused ion beam (FIB) milling, as shown in Fig.…”

“…An Si substrate (1.3 × 1.3 cm2) coated by a 3 nm Ti adhesion layer and sputtered by a 25 nm Au top layer, was used as the working electrode, and a Pt electrode and an Ag/AgCl electrode were used as the counter electrode and quasi-reference counter electrode, respectively. The solutions for alloy electrodeposition were prepared according to previous references [29][30][31]. In particular, the Ni-Mn electrodeposition solution consisted of 1 M NiSO4, 0.11 M MnSO4, and 0.49 M H3BO3.…”

Experimental study on friction-assisted electroforming of Ni-Co alloys

“…Nickel can easily prepare different nickel-based composites with other metal or non-metallic materials by electroforming to meet different physical and chemical performance requirements, which has aroused the interest of many researchers [1][2][3][4][5][6]. Electroformed Ni-Co alloy is mainly used to replace electroformed nickel in precision molds to improve the wear resistance and high-temperature resistance of the molds [7][8][9][10]. In addition, Ni-Co alloy deposits have good mechanical, chemical, physical and electrocatalytic properties and are widely used in electronics, computers, automobiles, energy storage devices, aerospace and other fields [11][12][13].…”