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Difference between cold-rolled steel strip and galvanized steel strip
Jun 05, 2017

Galvanized steel strip is common steel strip pickling, galvanized, packaging and other processes, the galvanized steel strip surface has galvanized layer and organic coating double protection, because of good anti-corrosion performance, it is widely used.

Hot Dip Galvanizing

Hot-dip galvanizing, also known as hot-dip galvanizing, is a method for obtaining metallic coatings in molten zinc solution of steel members. Usually galvanized (cold galvanized) layer thickness $number μ m, while the hot dip galvanized layer is generally above 35 μm, even up to 200 μm. Hot galvanizing coverage is good, coating density, no organic inclusions. As we all know, the mechanism of zinc resistance to atmospheric corrosion is mechanical protection and electrochemical protection, under atmospheric corrosion conditions, ZnO, Zn (OH) 2 and alkali zinc carbonate protective film are formed on the surface of zinc layer, which can reduce the corrosion of zinc, and the protective film (also known as white rust) will be damaged and a new film layer may form. When the zinc layer is damaged seriously and the iron-based body is endangered, zinc is dissolved as an anode when zinc and iron are formed, and the iron is protected as a cathode. It is obvious that the atmospheric corrosion resistance of hot dip galvanizing to the base metal iron is better than that of galvanization.

Cold Rolled steel strip is a hot rolled coil as raw material, at room temperature at the recrystallization temperature below rolling, including plate and coil. The surface of cold-rolled steel strip mainly relies on antirust oil and antirust paper protection.

So the main differences between galvanized steel strip and cold-rolled steel strip are as follows:

1. Galvanized steel strip has better mechanical properties.

2. Galvanized steel with better anti-corrosion performance, not easy to fade.

3. Hot-Dip galvanized coating uniformity, strong adhesion, not easy to delamination.

4. Longer service life.