Galvanized sheet is a type of steel that is made stronger and more resistant to rust by undergoing the galvanizing process. In addition to its durability, it is used in different ways in different sectors due to the fact that it is an easy-to-shape product.

Before moving on to the advantages of using galvanized sheet, let’s look at the functioning of the galvanizing method.

How does the galvanizing process take place?

The galvanizing process of flat steel sheets is carried out by passing the rolled flat steels through the molten liquid zinc bath at high speeds with the Continuous Hot Dip method. With the galvanizing process, the contact of the base metal/sheet with the atmosphere is prevented and its resistance to corrosion is increased. The galvanizing process with the Continuous Hot Dip method is carried out in the following 6 main stages.

Cleaning: The surface cleaning process is carried out by passing through the alkaline cleaning unit, ensuring that the cold rolling oil, rolling emulsion and similar residues on the surface are chemically and mechanically purified from the surface.

Rinsing/Drying: By using demineralized water, alkali solution is removed from the sheet surface. The rinsing tank also has scraper rollers. With the help of scraper rollers, the removal of water from the sheet surface is ensured. In the drying section, hot air at a temperature of approximately 45-50˚C is blown on both surfaces of the sheet, and the sheet is dried at the exit of the rinsing tank.

Annealing: The cold rolled flat steel sheet taken to the galvanizing line is heated to high temperatures-recrystallization temperatures to gain the desired mechanical properties.

Dipping (Zinc crucible): Zinc coating thickness is adjusted by passing compressed air through it at high speeds and blowing compressed air on both surfaces with the help of air knives in order to coat both surfaces of the steel sheet with molten zinc at a temperature of approximately 450˚C.

Cooling: After the coating processes, the sheet is cooled to a temperature of 40-50˚C by blowing air and aqueous cooling.

Leveler: The surface smoothness of the sheet is ensured to the one that is deformed/deformed during the annealing process.

Passivation: The passivation process is carried out by forming a thin film coating of the solution consisting of chromic acid, chromium salts and mineral acid on the sheet surface. The passivation process is applied to reduce the stains that may occur during storage and the sensitivity of the coating layer against white rust.