Hot galvanizing plate and manufacturing method therefor

Abstract

The invention relates to the technical field of a metal plate, in particular to a hot galvanized plate and a preparation method thereof. The hot galvanized plate comprises a steel board layer and a frosted galvanized layer covered on an outer surface of the steel board layer, wherein, a frosted surface is arranged in an even circular structure and the controllable density of distribution thereof is in the scope of 1 * 1 to 10 * 10mm <-2> while the controllable roughness Ra is in the scope of 1.0 to 10.0 micron and the Rpc value is 10 to 100cm <-1>. The preparation method of the galvanized plate comprises the steps of pickling of a hot-rolled substrate board, cold rolling of the pickled substrate board, degreasing of the surface of the hard-rolled substrate board, annealing of the hard-rolled substrate board, galvanizing of the annealed substrate board and frosted finish of the galvanized plate so as to obtain the frosted hot galvanized plate; in addition, the surface of an equalizing roller body used in the frosted finish of the plate is processed with laser frosted treatment. Meanwhile, the hot galvanized plate of the invention mainly solves the problems that the surface of the current galvanized plate is highly bright, and follow-up coatings and the substrate board have poor adhesion.

Description

technical field [0001] The invention relates to the technical field of metal sheets, in particular to a hot-dip galvanized sheet and a preparation method thereof. Background technique [0002] Galvanized sheets generally use steel sheets as the substrate, and galvanize the surface of the substrate to form a galvanized layer on both sides of the substrate, and use the corrosion resistance of zinc to form a protective effect to prevent moisture, salt and other substances from corroding the substrate. , affecting its service life. In production, the pickled and cold-rolled hard-rolled substrate is first degreased, then annealed and galvanized, and then smoothed by smooth rolls. The surface brightness of the galvanized sheet produced in this way is high, which cannot meet the matte effect required by customers. Moreover, the surface of such galvanized sheet is very smooth and the specific surface area is small. When the coating is applied, the coating and the zinc layer cannot ...

AI Technical Summary

Problems solved by technology

[0002] Galvanized sheets generally use steel sheets as the substrate, and galvanize the surface of the substrate to form a galvanized layer on both sides of the substrate, and use the corrosion resistance of zinc to form a protective effect to prevent moisture, salt and other substances from corroding the substrate. , affecting its service life

In production, the pickled and cold-rolled hard rolled substrate is degreased first, then annealed and galvanized, and then smoothed by smooth rolls. The galvanized sheet produced in this way has a high surface brightness and cannot meet the matte effect required by customers.

Moreover, the surface of such galvanized sheet is very smooth and the specific surface area is small. When the coating is applied, the coating and the zinc layer cannot form good adhesion.

Also because the surface is smooth, the oil storage performance on the surface of the plate is poor, and it is easy to cause stamping failure and scratches during the stamping process

The existing galvanized sheets described above have the problems of high surface brightness and poor adhesion between the sheet and subsequent coatings

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