Hot-dip galvanized steel and everything you need to know

Hot-dip galvanized steel and everything you need to know

BlogDate: 28-06-2024 by: Nhu Quynh

Hot-dip galvanized steel is a commonly used type of steel today, but not everyone understands what hot-dip galvanizing is.

In the article below, MRS Steel will help you synthesize information about what hot-dip galvanized steel is, what the process is, and the applications of this type of steel. Let's delve into the details now!!

Hot-dip galvanized steel pipe
Hot-dip galvanized steel pipe

What is hot-dip galvanized steel?

Hot-dip galvanized steel is steel with a zinc coating applied through a hot-dip process. This is a method of covering the surface of the product, especially steel pipes, with a protective layer. This protective layer of zinc covers both sides of the steel pipe, because it is completely immersed in a bath of molten zinc solution. temperature of 450℃. Therefore, hot-dip galvanized steel is covered with a uniform and durable layer of zinc on the entire surface, effectively preventing rust and corrosion.

Among all galvanizing methods, hot-dip galvanizing is the method with the best anti-rust ability. Hot-dipped galvanized steel products are used in all harsh environments and have a long service life.

Steel poles are being hot-dip galvanized
Steel poles are being hot-dip galvanized

What steps does the hot-dip galvanizing process?

The hot-dip galvanizing process, while not overly complicated, requires practitioners to be careful and meticulous in each step to ensure the resulting hot-dip galvanized steel products meet quality standards and achieve consistency.

Clean metal surfaces

Before hot-dip galvanizing, steel needs to be cleaned of dirt and oil during production, transportation, and storage. To clean steel surfaces, people soak them in a degreasing chemical bath, use NaOH solution, or dilute hydrochloric acid solution. The steel will then be rinsed with clean water.

After the surface is cleaned, the steel product will be dipped into a flux (a solution that helps remove the oxide layer formed on the surface). After being removed from the flux solution, the steel will be dried to prepare for the galvanizing process.

Carry out the galvanizing process

The dipping tank containing the molten zinc solution needs to reach temperatures between 454°C and 465°C before adding metal. When the temperature meets the requirements, steel is introduced to create a reaction between zinc and the metal surface to form a zinc alloy that covers the entire product surface. After the galvanized layer is formed, it is necessary to remove slag combined with vibration to completely remove excess zinc to form hot-dip galvanized steel products. Finally, dip the product in chromate to create a more durable protective layer for the surface.

One thing to note in the hot-dip galvanizing process is to completely submerge the steel in the zinc bath so that the coating adheres evenly and tightly. Depending on the desired thickness, adjust the dipping time appropriately. Avoid dipping for too long as the plating layer is too thick, causing loss of aesthetics and reducing the adhesion of the plating layer to the steel surface.

The dipping tank containing the molten zinc solution
The dipping tank containing the molten zinc solution

Finished Goods Inspections

In the final step, hot-dip galvanized steel will be put into a cold water tank to cool and achieve the highest aesthetic level. Then check the thickness of the zinc layer based on production standards. If the product fails, it will go to the acid cleaning step and start again.

Advantages of hot-dip galvanized steel

With a zinc outer coating, hot-dip galvanized steel offers superior properties compared to other types of steel.

  • Hot-dipped galvanized steel has high corrosion and rust resistance thanks to the zinc coating applied to the steel surface against harmful environmental factors such as oxidation, corrosion, and rust.
  • Hot-dip galvanized steel has outstanding durability, being able to withstand shocks and impacts during transportation.
  • Galvanizing ensures that areas exposed to corrosive environments are always protected by a surrounding zinc coating.
  • The process of dipping the entire steel product into a bath of molten zinc ensures that the steel possesses a uniform zinc coating on both the inside and outside of the product.
  • In addition, hot-dipped galvanized steel brings long-term economic value, if combined with a layer of paint or zinc plating, it creates a high economic efficiency for protecting steel in corrosive environments.

Hot-dip galvanized steel has high corrosion resistance
Hot-dip galvanized steel has high corrosion resistance

Application of hot-dip galvanized steel

With many outstanding advantages, hot-dip galvanized steel is widely used in many different projects.

Applied to construction projects: house construction, prefabricated house frames, scaffolding, reinforced concrete, construction materials for processing plants, airports and parking lots, ventilation doors, door shutters, windows, stairs, railings, rainwater collection networks, towers, masts, street lighting poles,...

Application in industrial production: manufacturing car frames, motorized spare parts, steel pipes for drainage in the water supply and drainage industry,...

Hot-dipped galvanized steel is used for interior decoration: tables and chairs, beds, wardrobes, storage cabinets,...

Hot-dip galvanized steel is used to make scaffolding
Hot-dip galvanized steel is used to make scaffolding

Can you powder coat galvanized steel

Hot-dip galvanized steel is very popular and used in a variety of projects and fields. This type of steel is resistant to rust and oxidation thanks to the outer zinc coating. However, a question that many people ask is: can you powder coat galvanized steel? To answer this question, please refer to the section below.

For projects or construction units that need to change the color of galvanized steel to create aesthetics and match the overall space, this is completely possible. Electrostatic coating of hot-dip galvanized steel comes in a variety of colors, giving consumers a variety of choices.

However, the process of making powder coating galvanized steel takes a lot of time with many different steps. You should especially consider the cost issue because the cost of electrostatic coating will be quite high. So if you just need to ensure the durability of the project, you should use hot-dip galvanized steel.

Galvanized steel after being powder coated
Galvanized steel after being powder coated

MRS Steel - A supplier of hot-dip galvanized steel

Hot-dip galvanizing technology has created high-quality products that are of great value to industry and life. Currently, MRS Steel is a reputable hot-dip galvanized steel supplier in the Vietnamese market.

Hot-dipped galvanized steel provided by MRS Steel comes from reputable brands such as Hoa Phat, Hoa Sen, TVP,.. Products are manufactured using modern technology lines, meeting European quality standards.

MRS Steel has brought you general information about hot-dip galvanized steel. Hopefully, the above article has helped you better understand this type of steel. If you need to buy hot-dipped galvanized steel products, please contact us.