galvanized steel Surface Treatment
(1) chromate passivation (C) and non-chromated (C5)
The surface treatment can reduce product during transport and storage surface white rust, chromium-free passivation treatment, should be limited to passive film squadron hexavalent chromium ingredients harmful to human health;
(2) chromating + oiled (CO) and chromium-free passivation + oiled (CO5)
The surface treatment can further reduce the product during transport and storage surface white rust.
(3) phosphate (P) and phosphate + oiled (PO)
The surface treatment can reduce product during transport and storage surface white rust, and to improve formability steel.
(4) The fingerprint-resistant film (AF) and chrome-free fingerprint resistant film (AF5)
Surface treatment can reduce product surface white rust during transport and storage, non-chromium passivation, should limit the passivation film squadron hexavalent chromium ingredients harmful to human health.
(5) oiling process (O)
Reduce transportation white rust, the rust preventive oil is generally not applied as a follow-rolling oil processing and stamping lubricants.
(6) do not handle (U)
When ordering must be specified in the contract, in this case, the surface of the steel sheet and strip surface during transport and storage easier to form white rust and black spot, the user should be careful in the selection.