Zinc-aluminum-magnesium coating product and preparation method thereof

The iron oxide sheet is removed by hot rolling coiling and acid washing, and the air-fuel ratio and nitrogen-hydrogen mixed gas environment is controlled during the annealing process, and the problems of iron oxide sheet residues and selective oxidation of alloy elements in zinc-aluminum-magnesium plating products are solved, achieving high-quality zinc-aluminum-magnesium plating products without surface leakage plating defects.

CN119640186APending Publication Date: 2025-03-18SHOUGANG GROUP CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202411817900.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

During the production process, existing zinc-aluminum-magnesium plating products are prone to residual oxide iron sheets and selective oxidation of alloy elements, resulting in leakage plating defects on the surface and affecting surface quality.

Method used

Hot rolling coiling and pickling washing are used to remove the iron oxide on the surface of the steel matrix, and the air-fuel ratio and nitrogen-hydrogen mixture environment are controlled through the heating section, the heating section and the cooling section during the annealing process to avoid selective oxidation of alloy elements.

Benefits of technology

It effectively removes the selective oxidation problem of iron oxide sheet and alloy elements on the surface of the steel matrix, avoids surface plating defects, and improves the surface quality of zinc, aluminum, and magnesium plating products.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the technical field of steel smelting, in particular to a zinc-aluminum-magnesium coating product and a preparation method thereof. The method comprises the following steps: carrying out hot rolling and coiling on a plate blank to obtain strip steel; pickling the strip steel to obtain a steel substrate; preheating the surface of the steel substrate, and then annealing to obtain a pretreated steel substrate; carrying out hot galvanizing on the pretreated steel substrate to obtain a zinc-aluminum-magnesium coating product; the annealing comprises annealing by adopting a heating section, a soaking section and a cooling section, and the heating section comprises heating by adjusting the air-fuel ratio according to the real-time temperature of different heating sections; the cooling section is used for cooling under the atmosphere condition of nitrogen and hydrogen mixed gas; the cooling section further comprises a furnace nose area, and the dew point temperature of the furnace nose area is smaller than or equal to-30 DEG C; according to the method, the problems of residual oxide scale on the surface of the steel substrate and selective oxidation of alloy elements in the annealing stage can be avoided, so that a zinc-aluminum-magnesium coating product without the surface plating leakage defect can be finally obtained.
Need to check novelty before this filing date? Find Prior Art