Abstract: The invention refers to a process for producing an anticorrosive coating in which a surface to be treated is brought into contact with an aqueous treatment solution containing chromium(III) ions and at least one phosphate compound and an organosol. The corrosive protection of metal surfaces, in particular those containing zinc and zinciferous surfaces with conversion layers is improved. The decorative and functional properties of the surfaces are retained or improved. In addition, the well-known problems associated with the use of compounds containing chromium(VI) or with multi-stage processes are avoided in which a passivation layer containing chromium ions and a sealing are applied one after the other.

Abstract: An agent for the production of anti-corrosion layers on metal surfaces is produced by producing an aqueous solution, which contains at least oxo-cations and halogen complex anions, and forming nanoparticles in the solution in situ by physical and/or chemical treatment of the solution. The oxo-cations are selected from MnO3+, VO3+, VO2+, WO22+, MoO22+, TiO2+, ZrO2+ and mixtures thereof, and the halogen complex anions have the structure MXab?, wherein M is selected from B, Ti, Zr, Si, Al, X is selected from F, Cl, Br, I, a is an integer of between 3 and 6 and b is an integer of between 1 and 4. The nanoparticles have a mean particle diameter of <500 nm.

Abstract: The invention refers to a process for producing an anticorrosive coating in which a surface to be treated is brought into contact with an aqueous treatment solution containing chromium(III) ions and at least one phosphate compound and an organosol. The corrosive protection of metal surfaces, in particular those containing zinc and zinciferous surfaces with conversion layers is improved. The decorative and functional properties of the surfaces are retained or improved. In addition, the well-known problems associated with the use of compounds containing chromium(VI) or with multi-stage processes are avoided in which a passivation layer containing chromium ions and a sealing are applied one after the other.

Abstract: An agent for the production of anti-corrosion layers on metal surfaces, produced by the following steps: A) producing an aqueous solution which contains at least the following: a) oxo-cations selected from MnO3+, VO3+, VO2+, WO22+, MoO22+, TiO2+, ZrO2+ and mixtures thereof, and b) halogen complex anions of the structure MXab?, wherein M is selected from B, Ti, Zr, Si, Al, X is selected from F, Cl, Br, I, a is an integer of between 3 and 6 and b is an integer of between 1 and 4, and B) forming nanoparticles having a mean particle diameter of <500 nm in the solution in situ by physical and/or chemical treatment of the solution, wherein the physical and/or chemical treatment is selected among a change in temperature, a change in the ion concentration, a change in the pH-value, a change in the pressure, supersaturation of the solution, agitation of the solution, adding an oxidising agent and/or adding a reducing agent.

Abstract: Agent for sealing metallic substrates, in particular zinc or zinc alloy substrates, characterized in that it consists of an aqueous dispersion of a) at least one silane derivative and b) a colloidal silica and/or colloidal silicate. This agent may be used for a direct coating of metallic substrates without chromatation.

Abstract: Bright electrodeposits of zinc/iron alloys onto iron of good ductility and adhesion are obtained at low electroplating voltage and high current yield by using a bath containing zinc sulfate, ferrous sulfate, conductive salt, citric acid and alkali metal acetate and, as additional ingredients, saccharin, a naphthalene mono-, -di- or -trisulfonate or a condensation product thereof with formaldehyde and/or an organic complexing agent for iron and further one or more compounds selected from the group consisting of alkali metal cumene sulfonate, alkali metal benzoate, collagen hydrolyzate having a mean molecular weight of from 500 to 2000 and a reducing agent for ferric irons selected from the group consisting of alkali metal bisulfite, alkali metal dithionite and hydroxy ammonium chloride.

Abstract: Bright electrodeposits of zinc/nickel alloys onto iron of fine crystalline structure are obtained by using an acidic bath containing the sulfates of zinc and nickel, alkali metal acetate and brightening agents, the brightening agents being (1) citric acid, (2) hexin-3-diol-2,5 and (3) naphthalene sulfonic acid having 1 to 3 sulfo groups which is optionally substituted by one or two C.sub.1 -C.sub.4 -alkyl groups and halogen atoms, respectively or a condensation product thereof with formaldehyde.

Abstract: Bright electrodeposits of zinc/iron alloys of good ductility and adhesion are obtained at low electroplating voltage and high current yield by using a bath containing zinc chloride, ferrous chloride, conductive salt and, as additional ingredients, saccharin, a dextrin of molecular weight 2,000 to 30,000 and, optionally, a reducing agent for ferric ions such as alkali metal bisulfite, alkali metal dithionite and hydroxyl ammonium chloride at a p.sub.H 1-3.5.