Method and device for continuous preparing of corrosion-resisting joist steel through hot dip aluminum plating method

Abstract

The invention discloses a method and device for continuous preparing of corrosion-resisting joist steel through a hot dip aluminum plating method. According to the method, a joist steel base body passes through a molten pool of melted high-purity aluminum from bottom to top in the device, wherein rare earth is added in the high-purity aluminum; the melted liquid is kept in the temperature range above the melting point; the surface of the joist steel base body is covered with an aluminum plating layer under the action of melt liquid viscidity and surface tension; then, the air knife technologyis adopted for conducting injection and thickness reduction on a hot dipping clad layer; and finally, after heat treatment is conducted in a heat treatment furnace, the corrosion-resisting joist steelin which the binding force between the clad layer and the joist steel base body is good is obtained. The joint steel is utilized for rapidly passing through the high-purity aluminum and proper-volumerare earth melt liquid to be provided with the aluminum plating layer through hot dipping, and then the joist steel with the excellent corrosion resisting performance is obtained through the heat treatment technology; and the beneficial effects that operation is simple and efficient, and preparing can be continuous are achieved, and therefore the preparing cost can be greatly reduced.

Description

technical field [0001] The invention relates to a method and a device for preparing an I-beam with high corrosion resistance, belonging to the fields of metallurgical technology and material science. Background technique [0002] I-beams, also known as steel beams, are long strips of steel with I-shaped cross-sections. They can be divided into ordinary I-beams and light I-beams. Profiles, grating floors, railings, cable distribution racks, tool handles, substation structures, overpasses and working platforms. However, a large amount of I-beams are lost each year to corrosion. At present, galvanized steel is mainly used for corrosion protection in the world, but the bonding strength between the zinc coating and the steel substrate is not good, and the corrosion resistance is not ideal, thus limiting its application. Therefore, it is of great economic significance to develop I-beam materials with high corrosion resistance. [0003] At present, many studies have been carried...

AI Technical Summary

Problems solved by technology

In the process of hot-dip galvanizing, a sinking roll needs to be placed in the aluminum or zinc bath as a non-drive turning roll. The temperature of hot-dip galvanizing is generally 440-460 °C, and the requirements for the material of the sinking roll are not very strict. However, It is very difficult to hot-dip high-melting point substances at higher temperatures to obtain the required materials, especially for functional materials that require very strict material purity. Hot-dip aluminum plating requires more than 700 ° C. At the same time, sinking rolls and The relative sliding of the strip will cause friction and scratches on the surface of the steel and will seriously affect the surface quality of the strip

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