Steel Sheet For Container, And Method For Producing Steel Sheet For Container

Abstract

This steel sheet for a container is provided with a steel sheet, an Ni plating layer formed on at least one surface of the steel sheet, and a chemically converted coating layer formed on the Ni plating layer, wherein the Ni plating layer contains 10-1000 mg / m2 of Ni in terms of the metallic Ni amount, and the chemically converted coating layer contains 5-30 mg / m2 of a Zr compound in terms of the metallic Zr amount. The average roughness Ra of the outermost surface of the chemically converted coating layer as determined by a scanning probe microscope is 10-100 nm, and when the amount of changein the yellowness index measured for one measurement point in the outermost surface of the chemically converted coating layer is defined as DELTAYI as represented in formula (2), the average value forthe DELTAYI absolute values obtained for a plurality of said measurement points included in a unit area of the outermost layer is 5.0 or less.

Description

technical field [0001] The present invention relates to a steel plate for containers and a method for manufacturing a steel plate for containers. Background technique [0002] As beverage and food containers, metal containers obtained by canning steel sheets such as Ni-plated steel sheets, Sn-plated steel sheets, or Sn-based alloy-plated steel sheets (steel sheets for containers) are often used. When such a metal container is used as a beverage container or a food container, it is necessary to coat the surface of the metal container before or after canning. [0003] However, in recent years, from the viewpoint of global environmental protection, in order to reduce exhaust of wastes such as waste solvents and carbon dioxide gas caused by coatings, affixing films to metal surfaces instead of coating has become more and more common. [0004] In order to ensure corrosion resistance and paint adhesion (paint adhesion) or film adhesion (film adhesion), rust prevention using chrom...

AI Technical Summary

Problems solved by technology

[0005] Recently, however, the use of hexavalent chromium has been shunned due to the environmental hazards of hexavalent chromium used in chromating

On the other hand, since the chromate film layer has excellent corrosion resistance and coating adhesion or film adhesion, the corrosion resistance and coating adhesion will be lower if such chromate treatment is not performed. Significantly reduced sex or membrane adhesion

Images