China factory gi coil zinc coated steel hot dipped galvanized steel coil

China factory gi coil zinc coated steel hot dipped galvanized steel coil,We BOMIS steel can provide professional services and high quality products, looking forward to your enquiry!

Pre painted Galvanized Steel Coils Structure

Prepainted steel coil coatings can be divided into three categories: primer, topcoat, and backcoat. Common ones are 2/2 and 2/1 coating structures.

The back side of the 2/1 can be coated with a layer of primer or only a layer of backcoat. It is mainly used for sandwich panels, which require the coating to have good bonding and foaming properties. The 2/2 uses a two-coat system of primer and backcoat, and is used as a single steel sheet.

Top Finish Coating (PE/HDP/PVDF, etc.), When the thickness is above 20um, it can effectively prevent the damage of ultraviolet rays and harsh environments to the coating.

1.Primer Coating 

2.Surface Treatment Layer(Chromate Coating) 

3.Metallic Coated Layer (zinc) 

4.Steel Substrate (Cold Rolled Steel Sheet) 

5.Metallic Coated Layer (zinc) 

6.Surface Treatment Layer (Chromate Coating) 

7.Back Primer 

8.Back Finish Coating(Epoxy, Polyester )

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