Surface Treatment of Galvanized Steel Coil
There are some different surface treatment methods to reduce the risk of corrosion during storage and transportation.
1. Passivation
After being passivated, it can reduce rust (white rust) during storage and transportation. However, passivation hinders the adhesion of most coatings. In general, other types of galvanized layer, except for zinc-iron alloy coating, will go through passivation treatment at the factory.
2. Oiling
Oiling can reduce the corrosion of steel sheets under wet conditions. Please note that the oil layer should be removed with a degreaser that does not damage the zinc layer.
3. Organic Coating Film
Using a thin transparent organic coating film on the surface can provide additional corrosion protection, as well as fingerprint resistance. It can also serve as the adhesion for subsequent coating.
4. Phosphating
Phosphating treatment also is able to improve the adhesion and corrosion resistance of zinc coating. And it can be coated without further treatment in addition to normal cleaning.
If you have special requirements, please let us know.
Steel coils are often packaged with waterproof kraft paper and plastic film inside, and steel sheets outside. Then it will be tied up with steel stripes. In order to fix it during transportation, we will use wood pallets. If you have special requirements, please talk with us! Below are some tips for your reference.
How to Transport and Store GI Coils?
1. Choose a ventilated place for storage to avoid dew erosion or moisture penetration;
2. Confirm that the wrapping paper is not damaged during storage;
3. Shorten the storage time as much as possible and protect its surface;
4. Prevent dirt and oil powder from sticking to the surface, which will affect the galvanizing effect;
6. Place a skid or a support frame under the steel coil, and stack the coils into two layers;
7. Use rain cloth during transportation. Also, fix the coils with the skids, rubber pads, and ropes.
