| 摘要 |
A no-rinse aqueous chemical composition for treating a metallic surface prior to application of an organic siccative coating characterised in that it comprises from 1.5 to 40 g/l (total) of Cr (VI) and optionally one or more of Ni, Co, Mg, Fe and Zn, and from 0.3 to 6.0 g/l (total) of F<-> and optionally PO4<3><-> is disclosed. A process for treating a metallic surface prior to application of an organic siccative coating characterised in that it comprises applying to the surface such a composition and not rinsing is also disclosed. |
