Electroplate liquid and method for electroplating steel shell through electroplate liquid

Abstract

The invention discloses electroplate liquid and a method for electroplating a steel shell through the electroplate liquid. Water serves as a solvent of the electroplate liquid. In the electroplate liquid, the concentration of NiSO4 ranges from 30 g / L to 60 g / L, the concentration of NiCl2 ranges from 10 g / L to 30 g / L, the concentration of lauryl sodium sulfate ranges from 0.05 g / L to 0.3 g / L, the concentration of an alkyne compound ranges from 0.1 g / L to 0.5 g / L, and the concentration of sodium allysulfonate ranges from 1.0 g / L to 1.5 g / L. A more compact and evenly-electroplated nickel-plated layer can be obtained on the inner surface of the steel shell through the synergistic effect of components in the electroplate liquid, the precipitation concentration of iron ions in the steel shell isbelow 5 ppm, the thickness of the nickel-plated layer on the inner surface of the steel shell is not smaller than 0.5 micrometer, the thickness of a nickel-plated layer at the inner top of the steelshell ranges from 0.2 micrometer to 0.4 micrometer, and therefore the problem that air expansion and liquid leaking are caused after primary batteries are formed in batteries after batteries are stored for a long time is reduced, and the electric performance of batteries is improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular, the invention relates to an electroplating solution and a method for electroplating a steel shell by using the electroplating solution. Background technique [0002] Generally speaking, an alkaline battery is composed of a steel shell, a cathode, an anode, a diaphragm, and an electrolyte. Among them, the steel shell is one of the most important parts of the alkaline manganese battery, which plays the dual role of the active material storage container and the positive electrode collector in the battery. As an active material container, it must have sufficient mechanical strength, occupy as little space as possible in the battery, and be able to withstand the corrosion of chemical substances inside the battery; as a positive electrode collector, it must have as high a conductivity as possible, and The best possible electrical contact with the positive active material is possible. Th...

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Problems solved by technology

However, in the subsequent electroplating process, since the steel case of the battery is a deep-hole device, the nickel plating layer inside the steel case is unevenly plated, which leads to the precipitation of iron ions in the steel case into the electrolyte. Galvanic cells are formed inside the battery, causing bloating and gas leakage

However, the nickel-plated cold-rolled thin punched steel case is expensive, and the nickel coating may be torn during the punching process, resulting in iron ions in the steel case being precipitated into the electrolyte, and stored in the battery for a long time. Forming a primary battery, causing inflation and gas leakage, affecting the electrical performance of the battery, and even more serious damage to electrical appliances

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