According to the processing method, we divide galvanized steel into the following categories:
1. Electro-galvanized Steel Coil
Electro-galvanizing is a process of applying a layer of zinc to steel through electroplating, with a saline anode and steel conductor. It is able to enhance the corrosion and heat resistance of steel. Its surface is smooth and uniform. Also, it looks shiny and silver-white, which is more beautiful than a hot-dip one. Moreover, it is cheaper than hot-dip galvanized steel.
2. Hot-dip Galvanized Steel Coil
As the name implies, hot-dip galvanizing is immersing the cleaned iron sheet into the molten zinc bath at about 500 degrees to form a zinc layer. It is the most commonly used method. It has some advantageous features:
1) The entire steel surface is uniformly covered with a zinc layer, even the corners, hollows, etc. so that the steel sheet is fully protected.
2) The zinc coating of hot dip galvanized steel is thick and tough, which offers superior corrosion resistance. So it is more durable to use. At Wanzhi Steel, the maximum zinc layer thickness can reach up to 275 g/㎡.
Differences Between Hot-dip and Electro Galvanized Coils：
1. Resistance to Corrosion
The corrosion resistance of hot-dip galvanized coil is much better than that of an electro-galvanizing one. It is because of the thickness of the zinc layer and the adhesion between the base metal and zinc layer.
2. Thickness of Zinc Layer
Generally, the thickness of the electro-galvanizing layer is 5~15 μm, and the hot galvanizing layer is often more than 35 μm, or even as high as 300 μm.
3. Applications
Hot-dip galvanizing products are widely used in transportation, building, communication, electric power, energy, automobile, petrochemical, home appliances, and other industries. While the electro-galvanized coil is more suitable for small parts, or indoor environments, etc.
4. Appearance
The appearance of the electro-galvanized coil is more smooth and bright. While the surface of the hot-dip galvanized coil is rough and dull.
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