Hot-dipping Zn-Al-Mg coating steel plate with excellent dip plating performance, and production method

Abstract

The invention provides a hot-dipping Zn-Al-Mg coating steel plate with an excellent dip plating performance, and a production method. A coating contains 1 to 5 percent of Al, 1 to 3 percent of Mg, less than or equal to 0.0104 percent of Fe, 0.1 to 1 percent of Si, 0.01 to 1 percent of Ce, and the balance Zn and inevitable impurities. Compared with the prior art, according to the hot-dipping Zn-Al-Mg coating steel plate with the excellent dip plating performance, and the production method provided by the invention, through designing the plating solution element content, adding 0.1 to 1 percentof Si and 0.01 to 1 percent of Ce, and controlling Al to be 1 to 5 percent, the infiltrating performance of a plating solution and a substrate is improved, and a large number of iron elements are prevented from being brought into zinc liquid so as to cause an adverse effect, so that the coating is uniform and fine in microstructure. The designed plating solution adapts to a steel plate for a common household appliance and has a good infiltrating effect on the surface of the steel plate; and in addition, through optimizing annealing and hot-dipping processes, the coating formed on the surface of the steel plate is fine and uniform in microstructure without skip plating or shrinking and is remarkably improved in pitting corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized steel sheet processing, and in particular relates to a hot-dip Zn-Al-Mg coated steel sheet with excellent dipping properties and a production method. Background technique [0002] Hot-dip galvanized aluminum-magnesium coated steel sheet is being widely researched and developed as a new type of high corrosion resistance material. Because of its high corrosion resistance and excellent anti-cutting corrosion ability, it is widely used in automobiles, home appliances, construction, animal husbandry and other industries. [0003] In recent years, articles and patents about hot-dip galvanized aluminum-magnesium coatings have also appeared in the newspapers. Nippon Steel and Nisshin Steel Works Co., Ltd. are the earliest enterprises to develop zinc-aluminum-magnesium coatings. Patent publication numbers CN 1265013C, CN 102292464B, CN103415641B and CN 105793468B all report the excellent prope...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the aluminum content in the plating solution is often high, because when the aluminum content is high, it is easy to produce a large amount of bottom dross, which is not conducive to the improvement of the surface quality of the coating, and if the content of Al and Mg elements is simply reduced, it is not conducive to the infiltration of the steel plate. resistance, prone to missing plating

Images