A coating control method and its application

Abstract

The invention discloses a plating control method. In the process that strip steel is separated from the solution surface of a plating solution, plating solution brought out of the solution surface by the strip steel is subjected to ultrasonic vibrating treatment through ultrasonic waves at first, and then jetting treatment is conducted through an air knife device. A curved surface of the plating solution brought out of the solution surface by the strip steel is formed between the strip steel and the solution surface, and the ultrasonic wave acts on plating solution within the range of the curved surface. The viscosity of nonferrous liquid metal is lowered through an ultrasonic device, and the splatter effect of liquid metal adhered to the strip steel surface is produced through the vibration produced by the ultrasonic wave in the liquid metal, so that a part of liquid metal is automatically stripped from the strip steel surface and the weight of nonferrous liquid metal brought out by the strip steel in operation is lowered. The accurate control over the thickness of plating can be achieved through the air knife scraping device with low gas pressure and flow. The slag production amount is greatly reduced; the pollution of noise and dust is also reduced; the design and manufacturing cost of an air knife is reduced; the problem of plating of thin plating in high speed condition is solved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a coating control method for coating weight control in a strip post-processing continuous hot-dip production line and an application thereof. Background technique [0002] An important means of anti-corrosion of steel is to coat its surface with a layer of non-ferrous metals, such as aluminum and zinc. effect. There are usually two types of electroplating and hot-dip plating. Electroplating is used less due to its high cost and serious pollution, and hot-dip plating has become the mainstream in this field. [0003] The method of hot-dip plating is to heat and melt non-ferrous metals in a high-temperature and corrosion-resistant pool, generally called "zinc pot" or "aluminum pot". The continuously running strip passes through an annealing furnace, which anneals the strip and then heats it to the temperature of the coating bath, and then enters a zinc or aluminum pot for hot-...

AI Technical Summary

Problems solved by technology

These slags will eventually be turned into waste and taken out of the pot. On the one hand, the expensive non-ferrous metals are wasted, and on the other hand, they will remain on the surface of the strip to form obvious surface defects.

[0006] 2. Noise pollution

[0007] 3. Dust pollution

[0008] 4. The speed of the production line is limited, and thinner coatings are not easy to achieve

On the one hand, due to the influence of noise and dust, the further increase of the pressure of the air knife is limited; on the other hand, the high-pressure and large-flow air knife will generate more slag, which is not economical and will also deteriorate the surface quality

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