Nickel chloride hexahydrate

Catalog Number	ACEP7791200
CAS Number	7791-20-0
Molecular Formula	NiCl2·6 H2O
EC Number	231-743-0

Case Study

Electrochemical Deposition of Polyaniline and Polyaniline Composites Using NiCl₂·6H₂O as Metal Source

Ünal, A. (2024). Sakarya University Journal of Science, 28(5), 1048-1056.

Polyaniline and polyaniline composite polymers were electrochemically deposited onto a working electrode (glass carbon electrode). Polyaniline was electrochemically deposited in a solution containing 0.1 M aniline monomer and 0.1 M HCl, with a scan rate of 10 mV/s, cycling several times. The polyaniline composite polymer films were prepared from a solution containing 0.1 M aniline, 0.1 M HCl, and varying amounts of Na₂MoO₄·2H₂O (or Na₂WO₄·2H₂O), electrochemically deposited at a scan rate of 10 mV/s. The resulting polyaniline polymer and polyaniline composite films were then cycled several times at 50 mV/s in 1 M HCl solution without the monomer, and their properties were characterized using cyclic voltammetry.
On the other hand, the use of 0.1 M HCl during the electrochemical deposition of polyaniline is essential because, in the presence of 1 M HCl, inorganic substances tend to precipitate. Using 0.1 M HCl prevents the formation of a film during deposition. If the testing solution is 1 M HCl, the polyaniline composite films containing inorganic substances can be easily analyzed. Similarly, in the presence of nickel sulfate, nickel chloride, and sodium citrate, polyaniline composites are obtained from Na₂MoO₄·2H₂O and Na₂WO₄·2H₂O, leading to the formation of Ni/Mo and Ni/W alloys in the polymer matrix. For this purpose, a solution was prepared containing 0.25 M NiSO₄·2H₂O, 0.05 M NiCl₂·6H₂O, Na₂WO₄, Na₂MoO₄·2H₂O as metal sources (with 0.05 M W and/or 0.05 M Mo), and 0.4 M Na₃C₆H₅O₇·2H₂O as a complexing agent.

Electrodeposition of Nickel-Cobalt Porous Layer Using NiCl₂·6H₂O Electrolyte

Jianxin, Zhou, et al. "Effect of Different Concentrations and Electrodeposition Times on Magnetic Field Assisted Nickel-Cobalt Porous Catalysts."

In order to obtain a hydrogen catalytic electrode with high catalytic activity and good stability for alkaline water electrolysis, a nickel-cobalt porous catalyst was electrodeposited on a nickel mesh surface using an 0.8T inductive magnetic field method.
Under magnetic field conditions, the nickel-cobalt particles were electrodeposited onto the nickel mesh substrate using the hydrogen bubble template (DHBT) method. All materials used in the experiment were of analytical grade. Before electrodeposition, the nickel mesh substrate (2cm × 2cm) was pretreated by ultrasonic cleaning in acetone solution for 30 minutes to degrease, followed by rinsing with deionized water. The substrate was then ultrasonically cleaned in 1 M HCl solution for 30 minutes, rinsed with deionized water and anhydrous ethanol, and allowed to dry to ensure the surface was clean.
The electrolyte composition consisted of CoCl₂·6H₂O (20 g·L⁻¹), NH₄Cl (100 g·L⁻¹), and H₃BO₃ (15 g·L⁻¹), with NiCl₂·6H₂O content ranging from 20 g·L⁻¹ to 80 g·L⁻¹. NiCl₂·6H₂O served as the primary source of nickel in the electrolyte, and CoCl₂·6H₂O provided the cobalt source for the entire electrodeposition process. The pH was adjusted between 4 and 5 using 1% HCl and ammonia solution. A magnetic field of approximately 0.8 T was applied at a distance of 5 mm from the working electrode using a Gauss meter. The cleaned nickel mesh substrate was used as the working electrode, and a platinum sheet was used as the counter electrode. The entire electrodeposition process was carried out at room temperature, with a current density of 125 ASD and deposition times ranging from 30 to 120 seconds.

Electroplating of Bright Nickel Coating on Brass Substrates Using NiCl₂·6H₂O Containing Electrolyte

Šestan, Indira, et al. "The influence of current density and electrodeposition time on the quality of nickel coating." (2023).

Nickel is one of the most important metals deposited through electroplating. The resulting coating can act as a barrier between the metal and corrosive media, thereby slowing down or preventing the occurrence of corrosion. A bright nickel plating electrolyte containing NiCl₂·6H₂O, NiSO₄·6H₂O, and H₃BO₃ was used as the base to electroplated a bright nickel coating on brass substrates.
Experiment
Brass plates were chosen as substrates, and the nickel coating was tested according to specific parameters. The brass plates were first cleaned and prepared for electroplating. The primary components of the electrolyte used for bright nickel electroplating are listed in the table.
The coating thickness was measured using the standard coulometric method. Each sample was analyzed at three different marked positions. The visual quality and presence of pitting were determined using the Hull cell. The Hull cell test was conducted on the brass plates, using compressed air for mixing at a temperature of 50-55°C. The test duration was 10 minutes. The tests were performed on 8 different nickel-plated brass plates. Four plates had an electroplating current density range of 2-5 A/dm² with a constant time of 10 minutes, while the other four plates had time intervals ranging from 5-20 minutes with a constant current density of 2 A/dm².

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