NON-CHROME THIN ORGANIC-INORGANIC HYBRID COATING ON ZINCIFEROUS METALS

摘要

The present invention relates to a treatment solution for the deposition of a thin organic/inorganic hybrid coating on a zinciferous metal surface, comprising water and (i) a concentration of phosphoric acid (A); (ii) a concentration of dissolved inorganic components (B) containing at least one complex fluoro metallate anion selected from the group of titanium, zirconium, hafnium and/or silicium, preferably hexafluorotitanic acid; (iii) a concentration of dissolved inorganic components (C) consisting of bivalent cations of zinc (C₁) and/or manganese (C₂); (iv) a concentration of a dissolved inorganic component (D) consisting of oxoanions of molybdenum; (v) a concentration of a water soluble and/or water dispersable polymeric compound (E) which is based on a chelating poly(vinylphenol) compound; (vi) a concentration of a water-soluble and/or water-dispersable polymeric resin (F) being not part of or identical with component (E). The thin organic/inorganic hybrid coating on the zinciferous metal surface is deposited according to this invention with a film weight of at least about 0.4 g/m² and not more than about 1.6 g/m² imparting to the coated material a temporary corrosion protection and excellent lack adhesion to further applied organic coatings. Additionally, the invention relates to the use of a zinciferous metal substrate coated with an organic/inorganic hybrid coating that provides a surface resistance of said coated substrate that is not more than 1.5 mO and preferably not more than 1 mO in industrial assembling and forming routines and for applying a multi-layer coating to said substrate in industrial metal surface finishing such as coil coating, car body painting lines, white goods and electronic housing production.