| 摘要 |
A treatment composition for the surface treatment of rolled metal for use in particular in a coil coating or pre-coating process and plant, comprising water as the solvent means and at least one resin binder in the solvent means designed to provide when in use a surface film structure covering a surface of the rolled metal. The treatment composition further comprises means passivating the surface of the rolled metal in the solvent medium. A plant comprises a first station for application of the composition to one or both sides of a strip of rolled metal, followed by a stove to dry the composition and another station for the application of a finishing layer to one side of a strip. The invention makes it possible to eliminate the various stages of surface conversion and passivation of the metal which in known processes precede application of the primer to the surface of the rolled metal. The composition is also useful as a single product for use in providing surface finishes similar to back coating. |
