Surface

Parameter

Galvanized steel coils can be divided into hot-rolled galvanized coils and cold-rolled hot-dip galvanized coils.

Galvanized steel coil has the characteristics of strong corrosion resistance, good surface quality, favorable for deep processing, economical and practical, so it is widely used in construction, home appliances, automobiles, containers, transportation And other fields, especially steel structure construction, automobile manufacturing, steel silo manufacturing and other industries.

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Passivation

The galvanized layer is passivated to reduce the occurrence of rust (white rust) under humid and warm storage and transportation conditions. However, the corrosion resistance of this chemical treatment is limited and, moreover, hinders the adhesion of most coatings. This treatment is generally not used in zinc-iron alloy coatings. Except for the smooth surface, as a routine, other types of galvanized coatings are passivated by the manufacturer.

Oiled

Oiling can reduce the corrosion of steel plates under wet storage and transportation conditions, and re-coating the steel plates and steel strips after passivation treatment with oil will further reduce the corrosion under wet storage conditions. The oil layer should be able to be removed with a degreaser that does not damage the zinc layer.

Paint Seal

An additional anti-corrosion effect, especially fingerprint resistance, can be provided by applying a very thin transparent organic coating film. Improves lubricity during molding and acts as an adherent primer for subsequent coats.

Phosphating

Through phosphating treatment, galvanized steel sheets 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 and reduce the risk of corrosion during storage and transportation. After phosphating, it can be used with a suitable lubricant to improve the molding properties.

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