Steel plate galvanizing method

Abstract

The invention relates to a steel plate galvanizing method, and belongs to the field of steel plate galvanizing technologies. A steel plate is subjected to hot galvanizing operation after acid picklingand annealing, the steel plate galvanizing method is characterized in that in the process of hot galvanizing operation, the temperature of the steel plate is 480 DEG C when the steel plate enters plating bath, the temperature of the plating bath in a zinc pot is 450-460 DEG C, the content of Fe in the plating bath is smaller than 0.03%, the content of Al in the plating bath is 0.26%, the speed ofa machine unit is 100-110 m / min, the cooling rate of the steel plate is 0-2%, and the depth-span temperature is 246-258 DEG C. According to the steel plate galvanizing method, mutual diffusion of theFe and Zn can be prevented through a Fe-Al intermediate layer between the steel plate substrate and a magnetic coating under the condition of a hot galvanizing technology, forming of Fe-Zn alloy layers is reduced, adhesiveness of a hot galvanizing steel plate coating is improved, and phenomena of falling and peeling of magnetic powder of the coating are reduced; and according to the steel plate galvanizing method, orientation optimization of crystal particles of the hot galvanizing steel plate coating is achieved through the condition of hot galvanizing technology, and scratch resistance, abrasion resistance and the adhesion property of the coating are obviously improved.

Description

Technical field [0001] The invention provides a method for galvanizing steel plates, belonging to the field of steel plate galvanizing processes. Background technique [0002] Hot-dip galvanized steel sheet has been widely used in manufacturing industries such as household appliances and automobile body panels due to its good corrosion resistance, excellent coating performance and clean exterior. The requirement for the coating of the hot-dip galvanized steel plate is that the coating has strong adhesion to the substrate and does not fall off during stamping deformation. In addition, it must have good welding performance, corrosion resistance and phosphating performance to ensure the adhesion of the paint film and after painting The corrosion resistance. However, hot-dip galvanized steel sheets have problems such as pulverization and peeling of the coating during the actual stamping process, which causes the damage of the coating, and further affects the corrosion resistance and...

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.

[0003] 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