A kind of manufacturing method of bimetallic hot-dip coating steel plate and steel plate thereof

Abstract

The invention provides a double-metal hot dip coating steel plate manufacturing method and a steel plate thereof. The double-metal hot dip coating steel plate manufacturing method comprises the steps that the steel plate to be subjected to hot dip coating sequentially enters two zinc pots arranged on a continuous hot dip coating production line, and a double-metal coating of aluminum alloy and zinc alloy is obtained; the steel plate to be subjected to hot dip coating enters the traditional zinc pot with a sinking roller at first and then enters the electromagnetic force suspension bottomless type zinc pot arranged over the traditional zinc pot; the traditional zinc pot is internally provided with aluminum or aluminum-silicon alloy in a molten state; the bottomless type zinc pot is internally provided with zinc or zinc alloy in a molten state; and the coating structure of the double-metal hot dip coating steel plate is a steel substrate-an aluminum-iron alloy layer-an aluminized layer-an aluminum-zinc alloy layer-a galvanized layer. The steel plate produced through the manufacturing method has the sacrificial anode protective effect of a galvanized steel plate and also has the high temperature resistance of an aluminized steel plate, and the double-metal coating steel plate can be conveniently and rapidly manufactured.

Description

technical field [0001] The invention belongs to the field of continuous hot-dip coating of steel plates, and in particular relates to a method for manufacturing double-metal coated steel plates or steel strips. Background technique [0002] Steel plates are prone to corrosion and rust, and most of them require anti-corrosion treatment. The most common ones are galvanization, tin plating, nickel plating, painting, anti-corrosion coating, sacrificial anode, etc. Metal plating is the most common and effective way. Common plating methods include hot-dip plating, electroplating, vacuum evaporation, magnetron sputtering, spraying and other methods. [0003] When used under some harsh conditions, a single coating cannot meet the requirements of use, so a double-layer coating has been developed, including methods such as painting on the coating, double-layer paint, etc. In this case, the double-metal coating It has also been developed, and the manufacturing methods include vacuum ...

AI Technical Summary

Problems solved by technology

[0003] When used under some harsh conditions, a single coating cannot meet the requirements of use, so a double-layer coating has been developed, including methods such as painting on the coating, double-layer paint, etc. In this case, the double-metal coating It has also been developed, and the manufacturing methods include vacuum evaporation, magnetron sputtering, electroplating, etc., but these methods are either expensive or not suitable for large-scale industrial production.