Nickel-chromium-plated steel band for battery steel shell

Abstract

The invention discloses a nickel-chromium-plated steel band for a battery steel shell. The steel band comprises the following chemical components in percentage by weight: 0.15 to 0.20 percent of C, 0.2 to 0.4 percent of Si, 0.5 to 0.7 percent of Mn, 0.01 to 0.02 percent of Als, 0.05 to 0.08 percent of Ti, less than or equal to 0.03 percent of P, less than or equal to 0.01 percent of S, 0.3 to 0.5 percent of Ni, 0.7 to 0.9 percent of Nb, less than or equal to 0.015 percent of N, less than or equal to 0.006 percent of O and the rest of Fe and unavoidable impurities, wherein the thickness of a chromium layer is 1.5 to 2.5 mu m; a solution for preparing the chromium layer comprises 600 to 620 g/L anhydrous chromic anhydride, 20 to 25 ml/L hydrochloric acid and the rest of water; the thickness of a nickel layer is 6 to 8 mu m; and a solution for preparing the nickel layer comprises 560 to 600 g/L nickel aminosulfonate, 12 to 14 g/L nickel chloride, 35 to 45 g/L boric acid and the rest of water.

Description

technical field [0001] The invention relates to the technical field of steel material processing, in particular to a nickel-chromium-plated steel strip for battery steel cases. Background technique [0002] The steel case production technology of existing secondary battery and alkaline primary battery is to use roll plating nickel plating layer again after molding with low carbon steel strip. Due to the difficulty in cleaning, insufficient plating depth and discharge at the tip of the plating during rolling nickel plating, this process is gradually being replaced by another process. Diffusion forms a nickel / iron diffusion layer, and effectively controls the thickness of the diffusion layer and controls the exposure rate of iron on the nickel-plated surface. [0003] U.S. Patent No. 5,679,181 discloses a production process for corrosion-resistant nickel-coated steel strips. The process is nickel-plated on at least one side of the cold-rolled steel strip, so that part or all ...

AI Technical Summary

Problems solved by technology

However, the existing technology mainly focuses on the electrodeposition of thin nickel coatings, so that in some processes such as deep rolling and deep drawing, the substrate is easily exposed because the coating is too thin; and due to the interface between the thick coating and the substrate Thick coatings are prone to coating peeling and peeling due to excessive stress or improper heat treatment process

The diffusion layer of the existing nickel-clad steel strip is mainly Fe-Ni or Fe-Ni-C diffusion layer, which has a high iron exposure rate, which is easy to reduce the anti-corrosion performance, and the heat treatment process is not suitable, and it is easy to form a phase boundary at the interface. The interface mechanical properties of engineering materials are extremely harmful

In addition, a good matching relationship cannot be formed in terms of elongation, tensile strength, and hardness

The shortage of these nickel-coated steel strips makes them unsuitable for the working conditions of battery steel casings