GI coil

GI coil refers to the process of galvanizing ordinary carbon construction steel, which can effectively prevent steel corrosion and rust, thereby extending the service life of the steel. Galvanization is divided into electric galvanizing and hot-dip galvanizing. GI coil is mainly produced by continuous galvanizing process, which involves continuously immersing rolled steel plates in a molten zinc plating bath to produce galvanized steel plates; Alloy galvanized steel plate. This type of steel plate is also manufactured by hot dip method, but immediately after leaving the groove, it is heated to around 500 ℃ to form an alloy coating of zinc and iron. This type of galvanized coil has good coating adhesion and weldability.

Surface treatment of GI coil products
Passivation
The passivation treatment of the galvanized layer can reduce the occurrence of folding rust (white rust) under humid temperature storage and transportation conditions. But the anti-corrosion performance of this chemical treatment is limited, and it hinders the adhesion of most coatings. This treatment is generally not used on zinc iron alloy coatings. Except for smooth surfaces, GNEE passivates other types of galvanized coatings as a routine.
Oiling
Applying oil can reduce the corrosion of steel plates under humid storage and transportation conditions. After passivation treatment, the steel plates and strips can be further reduced by applying oil under humid storage conditions. The oil layer should be able to be removed with a degreaser that does not damage the zinc layer.
Lacquer sealing
By applying an extremely thin layer of transparent organic coating film, an additional anti-corrosion effect, especially fingerprint resistance, can be provided. It can improve lubrication during molding and serve as an adhesive layer for subsequent coatings.
Phosphating
By phosphating treatment, GI coils of various coating types can be coated without further treatment, except for normal cleaning. This treatment can improve the adhesion and corrosion resistance of the coating, reducing the risk of corrosion during storage and transportation. After phosphating, it can be combined with suitable lubricants to improve the forming performance.
Not processed
Steel plates and strips supplied according to this standard may not undergo surface treatment such as passivation, oil coating, paint sealing, or phosphating only when the purchaser requests and is responsible for it.
Gi coil suppliers
GI coils have advantages such as formability, paintability, weldability, and good ductility in use. GNEE's technology for producing GI coils is increasingly moving towards large-scale and low-cost development. If you are interested in our products, please feel free to contact us at any time.