Thin Organic Precoatings
|Publication Date:||1 August 2012|
This standard covers the requirements for thin organic precoatings applied to a hot dip coated or electrogalvanized sheet steel substrate. The substrate may be cold or hot rolled sheet steel.
Material Description. Thin organic precoatings are applied on zinc plated coil material by no-rinse technique. To realize good adhesion, chromium-free adhesion promoters are used. For improved adhesion and creep back resistance a passivation can be applied before the application of the adhesion promoter itself. The thin organic precoating can be based on different polymer systems like epoxy, polyurethane, polyacryl or polyester. The weldability is guaranteed by pigments.
At present time, thin organic precoatings are not used for outer surfaces because of paint appearance aspects.
First generation products are not suitable on Bake-hardening substrates because of higher curing temperatures.
Symbols. Not applicable.
Typical Applications. Thin organic precoatings serve to improve the corrosion protection of flanges and contact faces which cannot at all or only insufficiently be protected from corrosion by secondary measures such as E-coating, application of hem flange sealants or cavity waxing.
Remarks. Not applicable.