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How to Protect Galvanized Steel Coil from White Rust?
We usually Conduct Surface Treatment During Galvanized Steel Coil Production to protect Galvanized Steel Coil from white rust. Follow is the detailed measures.
#1 Oiled Treatment
It refers to the method of oiling the galvanized steel coil to prevent zinc from contacting the air directly. It has a good rust-proof effect for moisture condensation and water immersion. However, oil on the surface of the steel sheet must be wiped off before painting.
#2 Parkerizing Treatment
If the galvanized steel sheet is for the purpose of painting, phosphate membrane treatment can be adopted. Phosphate will be firmly attached to the galvanized surface to make it lose and porous, thus providing good footing for coating and getting strong adhesion effect. Users only need to conduct simple degreasing before painting.
#3 Fingerprint-Proof Resin Paint Film Treatment
Cover the galvanized steel sheet with a layer of the organic resin paint film to prevent any scratch or bruise during the molding or forging process of steel sheet and roller. It also can avoid finger mark or sweat stain from operation personnel during the machining and handling process, thus preventing rust.
#4 Chromatic Treatment
It refers to the method of immersing galvanized steel coil in the chromatic acid solution to enable the surface of the zinc coating layer to be covered by a thin film of low activity. Even if the chromatic acid membrane is slightly damaged by hit, the chromatic anhydrous around can dissolve in water to cover the injured area and form a new film again. This method can effectively prevent white rust for its self-recovery and protection function. Chromatic treatment is mainly for applications without painting. Moreover, the surface with chromatic acid coating appears yellow. Do not mix it with rust.