galvanized steel coil Surface Treatment

7.9 Surface Treatment
Steel sheet and strip generally following surface treatment.
7.9.1 chromate passivation (C) and chromium-free passivation (C5)
The surface treatment can reduce product during transport and storage surface white rust. Chromium-free passivation, the passivation film hexavalent chromium substances harmful to human health restrictions.
7.9.2 chromate passivation + oiled (CO) and chromium-free passivation + oiled (CO5)
The surface treatment can further reduce the product during transport and storage surface white rust. Chromium-free passivation, the passivation film hexavalent chromium substances harmful to human health restrictions.
7.9.3 chromium-free fingerprint resistant (N5)
The surface treatment can reduce product during transport and storage surface white rust, while fingerprint-resistant film may increase perspiration stain electronic or electrical product surface. Chromium-free fingerprint resistant film for hexavalent chromium substance harmful to human health restrictions.
7.9.4 Self-lubricating (SL)
The surface treatment can reduce product during transport and storage surface white rust, while self lubricating film can better improve the molding properties of the steel sheet.
7.9.5 oiled (O)
The surface treatment can reduce product during transport and storage surface white rust, rust painted oils generally not as subsequent processing of rolling oil and stamping lubricants.
7.9.6 do not handle (U)
This surface treatment applies only to the demand side, clearly stated during the ordering without surface treatment, and must be marked in the contract. In this case, the surface of the steel sheet and strip in the transport and easier to produce white rust during storage, users should be chosen carefully considered.
7.10 Surface Quality
7.10.1 steel sheet and 
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