Steel strip plated with multi-layer micron/nano-crystal nickel films and preparation method thereof

Abstract

The invention discloses a steel strip plated with multi-layer micron / nano-crystal nickel films and a preparation method thereof. A steel strip is used as a base, and multi-layer micron / nano-crystal nickel films are respectively plated on the two surfaces of the base. The bottom layer of the multi-layer micron / nano-crystal nickel films is a micron-crystal nickel-plated layer, wherein the crystallite dimension of the plated layer is from 0.1 to 0.5 micron, and the thickness of the plated layer is from 0.5 to 2.0 microns. The middle layer of the multi-layer micron / nano-crystal nickel films is a nano-crystal nickel-plated layer, wherein the crystallite dimension of the plated layer is from 50 to 100 nanometers, and the thickness of the plated layer is from 0.5 to 1.5 microns. The surface layer of the multi-layer micron / nano-crystal nickel films is a nano-crystal nickel-plated layer, wherein the crystallite dimension of the plated layer is from 20 to 50 nanometers, and the thickness of theplated layer is from 0.2 to 1 micron. The bottom micron-crystal nickel-plated layer of the multi-layer micron / nano-crystal nickel films is prepared by direct current electroplating, the middle nano-crystal nickel-plated layer is prepared by pulse electroplating, and the surface nano-crystal nickel-plated layer is prepared by pulse jet electroplating. The steel strip has the advantages of excellent elongation, corrosion resistance and stamping properties and can be used as the casing materials of high-performance batteries.

Description

technical field [0001] The invention relates to a steel strip coated with a micro / nano crystal nickel multilayer film and a preparation method thereof. Background technique [0002] The steel strip coated with multi-layer micro / nanocrystalline nickel film is a new type of battery casing material with excellent elongation, anti-corrosion ability and stamping performance, which is closely combined with micro / nano-crystalline nickel multi-layer film and low carbon steel substrate. Direct molding, no need for subsequent electroplating treatment, and continuous production can be realized. With the vigorous development of industries such as portable communication equipment, notebook computers, word processors and electric tools, the demand for steel strips coated with multi-layer micro / nanocrystalline nickel films will increase in the battery industry. [0003] The production and preparation method of the traditional secondary battery and alkaline primary battery steel shell is t...

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Problems solved by technology

[0008] The traditional nickel-plated steel strips mentioned above can be roughly divided into two categories. The first category mainly considers the corrosion resistance of the steel strip, and does not pay enough attention to the stamping performance of the steel strip; the second category mainly considers the stamping performance of the steel strip. performance, improve the surface hardness of the coating, and reduce friction, but this will lead to deep and many cracks in the steel strip, and a higher iron leakage rate, which will reduce the corrosion resistance of the material

[0009] In the above-mentioned various prior art, improving surface hardness is mainly by forming nickel-cobalt alloy, nickel-silver alloy and other noble metal alloy coatings on the surface, and then through finishing processes such as cold rolling to improve the surface compactness and surface hardness of the coating, by Laser shock treatment or heat treatment to form a nickel / iron diffusion layer to improve the bonding force of the coating, the process is complicated and the production cost is high

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