Hot galvanized plate production method

Abstract

The invention relates to the technical field of hot galvanizing, and in particular relates to a hot galvanized plate production method, which comprises the following steps: firstly, cleaning the surface of a steel strip to ensure that the surface of the steel strip is free of stains, dust, sundries and particles, and then putting the steel strip into a finishing machine for finishing treatment; secondly, performing roughening treatment on the surface of the steel strip obtained in the first step through laser pairs, so that the surface of the steel strip keeps a certain roughness degree; heating the steel strip, so that an oxidation film is generated on the surface of the steel strip, and then performing high-temperature reduction annealing treatment, so that the generated oxidation film is reduced into direct reduction iron; carrying out production treatment on the steel strip by adopting a conventional continuous galvanizing process; and soaking the steel strip in a chromate solution, wherein the PH value of the chromate solution is 1-2. According to the invention, through a hot galvanized plate produced by the above process, the smoothness of the surface of the galvanized plate can be guaranteed; it is effectively guaranteed that a zinc layer is not prone to falling off; and its corrosion resistance is enhanced.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing, in particular to a production method of a hot-dip galvanized sheet. Background technique [0002] Galvanized sheet refers to a steel sheet coated with a layer of zinc on the surface. Galvanizing is an economical and effective anti-rust method that is often used. About half of the zinc production in the world is used in this process. According to the production and processing methods, it can be divided into the following categories: hot-dip galvanized steel sheets, alloyed Galvanized steel sheet, electro-galvanized steel sheet, single-sided galvanized steel and double-sided differential galvanized steel, etc. Hot-dip galvanized steel sheet is a thin steel sheet that is immersed in a molten zinc tank to make a layer of zinc adhere to its surface. Production by galvanizing process, that is, continuous immersion of coiled steel plates in a plating tank with molten zinc to make galvanized...

AI Technical Summary

Problems solved by technology

This kind of galvanized sheet has good paint adhesion and weldability. Most of the hot-dip galvanized sheets currently on the market have relatively simple production methods, and most of them can only simply produce hot-dip galvanized sheets to make their quality meet the general requirements. After long-term use, the zinc layer is prone to fall off and the zinc layer is corroded, which is not conducive to ensuring the service life of the product. Therefore, a production method for hot-dip galvanized sheet is proposed to solve the above problems.