How should I clean my flowerless galvanized sheet?

There are two types of hot-dip galvanized zinc bloom: normal zinc bloom, and non-blooming galvanized sheet. In the old hot-dip galvanized products, it was not possible to refine the lead in the zinc solution, so there was always some shining on the surface. Therefore, in our old concept, hot dip galvanizing had many flowers. With the development of the automotive industry, if it was necessary to paint automotive panels that were hot dip galvanized, the bright flakes would interfere with the painting. Later, after reducing the lead content in zinc ingots and zinc liquids to tens of ppm, we could produce products with no or very little brightstreak, and the following editorial will introduce you to flowerless galvanized sheet.

Spotless galvanized sheet mainly refers to a special production process, usually, the lead in the zinc tank is controlled to a certain level, or the strip is taken out of the zinc tank and then undergoes a special treatment, such as a small brightening treatment or zinc powder spraying, in order to control the brightening to a certain range. Emulsions are used to clean the figural galvanized sheet, which not only reduces the rolling forces, but also ensures the quality of the figural galvanized sheet surface. According to the cleaning principle of galvanized steel, dirt can be eradicated from the surface of the steel sheet through a process of wetting, soaking, wrapping and stripping the cleaner.

When using an emulsion, not only can the emulsion be used, but additives can be added to the emulsion to improve the performance, so that the lubricant can form a mesh-like adsorption film on the metal surface to ensure that the quality of the surface of galvanized steel strip of the emulsion can have a certain degree of toughness and compressive strength in the future use. The additive improves the rolling properties of the emulsion on the one hand and ensures rolling stability on the other, since the polar molecules in the emulsion have a large adsorption force on the metal surface.

Zinc particles appear on the surface of hot-dip galvanized sheets, i.e. small, rough particles that have not been smoothed and affect not only the appearance but also the use. The reason for the formation of such particles is that during the production process of figural galvanized sheets, the machine stirs up and floats excessive bottom slag, which adheres to the surface of the hot-dip galvanized sheet and floats up due to high production temperatures. In addition, the bottom slag floats in the zinc solution.

If the aluminum content is too high, it is assumed that aluminum and zinc have a good affinity for each other, and therefore they are bound and attached to the surface of the galvanized sheet.Elimination of zinc particles can also be treated by prescribing the correct medication. For example, the bottom scum is often treated to keep the galvanizing environment clean; the temperature of the bath of the flowerless galvanized sheet should not be too high, it is advisable to keep it at 440℃~450℃. The aluminum content in the zinc bath should not be too high, keeping it at about 0.1%.

In addition, please note that long storage time will increase oxidation, etc. In short, they can be eliminated by strictly producing zinc particles. The formation of thicker edges on the surface of figural galvanized sheet means that the edges of the zinc layer of figural galvanized sheet are thicker than the middle portion, and this becomes a thicker edge defect, which is not conducive to strip coiling. Rough edges are divided into high speed rough edges and low speed rough edges, the reason for the formation of thicker edges is due to the improper adjustment of the angle of the air knife during galvanizing, which leads to blowing and the formation of turbulence, and it can be eliminated by properly adjusting the strength of the air knife.