Galvanization method for steel plate

Abstract

The invention discloses a galvanization method for a steel plate and belongs to the field of steel plate galvanization technology. The steel plate is subjected to hot galvanization operation after being subjected to acid pickling and annealing. The galvanization method is characterized in that during the process of the hot galvanization operation, the steel plate is at the temperature of 480 DEG C when being put into a plating bath, and the temperature of the plating bath in a zinc pot is 450 DEG C-460 DEG C; the content of Fe in the plating bath is smaller than 0.03%, and the content of Al in the plating bath is 0.26%; the speed of a machine set is 100-110 m / min, the cooling rate of the steel plate is 0-2%, and the high-span temperature is 246 DEG C-258 DEG C. According to the hot galvanization technological conditions of the galvanization method, interdiffusion between the Fe and Zn can be prevented by an Fe-Al intermediate transition layer between a substrate of the steel plate and a galvanization layer, so that formation of an Fe-Zn alloy layer is reduced, and the adhesiveness of a plating layer of the hot-galvanized steel plate is improved, and accordingly falling-off and stripping of zinc powder of the plating layer and other phenomena are reduced. Through the hot galvanization technological conditions of the galvanization method, the grain orientation of the plating layer of the hot-galvanized steel plate is optimized, and the scratch resistance, the abrasion resistance and the adhesiveness of the plating layer are significantly improved.

Description

technical field [0001] The invention provides a steel plate galvanizing method, which belongs to the field of steel plate galvanizing technology. Background technique [0002] Due to its good corrosion resistance, excellent coating performance and clean appearance, hot-dip galvanized steel sheets have been widely used in manufacturing industries such as household appliances and automobile body panels. The requirements for the coating of hot-dip stop steel plate are strong adhesion between the coating and the substrate, and it will not fall off when stamping and deformation. In addition, it must have good welding performance, corrosion resistance and phosphating performance to ensure [0003] The adhesion of the protective paint film and the corrosion resistance after painting. However, there are problems such as powdering and peeling of the coating during the stamping process of the hot-dip galvanized steel sheet, which causes damage to the coating and further affects the c...

AI Technical Summary

Problems solved by technology

However, there are problems such as powdering and peeling of the coating during the stamping process of the hot-dip galvanized steel sheet, which causes damage to the coating and further affects the corrosion resistance and removal property of the coating.

[0004] In the prior art, the adhesion between the coating and the steel base is improved by changing the composition of the steel sheet or by controlling the surface roughness of the hot-dip galvanized steel sheet to form a coating on the surface, but no good effect has been achieved. A method to improve the adhesion between the coating and the steel base by using the composition and structure