Abstract: A process for anticorrosion treatment of bare metal surfaces comprising steel surfaces, comprising contacting the bare metal surfaces with an acidic aqueous solution of a fluoro complex of at least one element M selected from the group B, Si, Ti, Zr and Hf, at least one further component selected from among: a buffer system for the pH range from 2.5 to 5.5, nitrate ions, copper ions, silver ions, vanadium or vanadate ions, bismuth ions, magnesium ions, zinc ions, manganese ions, cobalt ions, nickel ions, tin ions, aromatic carboxylic acids with at least two groups containing donor atoms, or derivatives of such carboxylic acids, and silica particles with an average particle size of below 1 ?m; and contains no more than 1 mg/l of an organic polymer with allylamine or vinylamine monomers; then rinsing the metal surfaces with water and thereafter coating them with a cathodically depositable electro-dipcoating.

Abstract: The present invention relates to an acidic, aqueous, particulate composition having a high stability with respect to agglomeration for autophoretic deposition of organic-inorganic hybrid layers on metal surfaces, comprising, in addition to iron(III) ions, fluoride ions and at least one dispersed organic binder (B), pigment-binder particles comprising a pigment portion and a binder portion (B), such that the binder (B) comprises a polymer of at least one monomer having acid groups and at least one polymerizable double bond. Likewise, the invention relates to the use of an aqueous dispersion comprising pigment-binder particles comprising a pigment portion and a binder portion (B) for the production of a self-depositing composition as well as a method for autophoretic deposition on metal surfaces.

Abstract: A metal sheet, inclusive of a metal strip, having a front side and a back side, both the front side and the back side comprising a first coating having an average thickness in the range from 0.5 to 10 ?m, wherein the first coating of the front side contains particles, which release divalent or multivalent metal ions upon the action of an acid, in such an amount that a self-depositing coating agent forms, upon contact with the front side, a second coating thereon, whereas this is not the case for the first coating of the back side. The first coating of the front side can be overcoated with a self-depositing coating agent. Cut edges that do not have a first coating can be covered with the self-depositing coating agent. Correspondingly coated metal sheets, as well as a method for the manufacture thereof, are furthermore within the scope of the invention.

Abstract: The present invention relates to an acidic, aqueous, particulate composition having a high stability with respect to agglomeration for autophoretic deposition of organic-inorganic hybrid layers on metal surfaces, comprising, in addition to iron(III) ions, fluoride ions and at least one dispersed organic binder (B), pigment-binder particles comprising a pigment portion and a binder portion (B), such that the binder (B) comprises a polymer of at least one monomer having acid groups and at least one polymerizable double bond. Likewise, the invention relates to the use of an aqueous dispersion comprising pigment-binder particles comprising a pigment portion and a binder portion (B) for the production of a self-depositing composition as well as a method for autophoretic deposition on metal surfaces.

Abstract: A metal sheet, inclusive of a metal strip, having a front side and a back side, both the front side and the back side comprising a first coating having an average thickness in the range from 0.5 to 10 ?m, wherein the first coating of the front side contains particles, which release divalent or multivalent metal ions upon the action of an acid, in such an amount that a self-depositing coating agent forms, upon contact with the front side, a second coating thereon, whereas this is not the case for the first coating of the back side. The first coating of the front side can be overcoated with a self-depositing coating agent. Cut edges that do not have a first coating can be covered with the self-depositing coating agent. Correspondingly coated metal sheets, as well as a method for the manufacture thereof, are furthermore within the scope of the invention.

Abstract: A process for anticorrosion treatment of bare metal surfaces comprising steel surfaces, wherein the bare metal surfaces are contacted with an acidic aqueous solution of a fluoro complex of at least one element M selected from the group B, Si, Ti, Zr and Hf, at least one further component which is selected from among: a buffer system for the pH range from 2.5 to 5.5, nitrate ions, copper ions, silver ions, vanadium or vanadate ions, bismuth ions, magnesium ions, zinc ions, manganese ions, cobalt ions, nickel ions, tin ions, aromatic carboxylic acids with at least two groups containing donor atoms, or derivatives of such carboxylic acids, and silica particles with an average particle size of below 1 ?m; and contains no more than 1 mg/l of an organic polymer with allylamine or vinylamine monomers; the metal surfaces are then rinsed with water and thereafter are coated with a cathodically depositable electro-dipcoating.

Abstract: The invention relates to a functionalized phenol-aldehyde resin which comprises a phenol-aldehyde condensation product, having a phenol component with no carboxyl group, and an aromatic hydroxycarboxylic acid and imidazole as constituents which is useful for corrosion-inhibiting treatment of bare or conversion-coated metal surfaces is provided. Methods of making the functionalized phenol-aldehyde resin, processes for coating metal surfaces using compositions according to the invention and products coated thereby are also included in the invention.

Abstract: The invention relates to a chromium-free, corrosion prevention treatment for steel, zinc or zinc alloys, aluminum, magnesium or alloys thereof in which the metal surfaces are contacted in a first step with a first aqueous solution having a pH of 1.5 to 5 which contains Ti and/or Zr and/or Si ions and at least such a quantity of fluoride that the atomic ratio of Ti to F and/or Zr to F and/or Si to F is in the range from 1:1 to 1:6 and then, optionally after rinsing with water, and thereafter in a second step are contacted with a second aqueous solution having a pH of 1.5 to 5 which contains Ti and/or Zr and/or Si ions and at least such a quantity of fluoride that the atomic ratio of Ti to F and/or Zr to F and/or Si to F is in the range from 1:1 to 1:6, and which additionally contains such a quantity of soluble anions of oxo acids of Mo (VI) and/or W (VI) that the total concentration of molybdenum and/or tungsten is in the range from 5 to 1500 mg/l.

Abstract: The invention relates to a corrosion protection method for application in connection with the production of finished metallic components from organically precoated metal sheets. In the course of such production, areas of uncoated metal which inevitably come about in the course of cutting, forming and joining the precoated metal sheets are provided with a chromium-free corrosion protection coat that is not a zinc phosphate coating, which serves at the same time as a tie coat for the subsequent finish. The treatment solution preferably contains fluoro complexes of Ti, Zr and/or Si and also organic polymers. The invention also embraces a metallic component treated accordingly.

Abstract: The invention concerns the use of a composition or premix based on volatile corrosion inhibitors comprising, in order to limit to a maximum the release and/or degradation of the volatile corrosion inhibitors when the composition or premix is being formed, either an efficient amount of a structuring agent consisting of at least one solid or pasty substance whereof the melting point ranges from 40 to 110° C. preferably from 50 to 90° C., or a liquid substance capable of forming, mixed with a mineral filler, a solid or pasty combination. The invention also concerns a composition based on volatile corrosion inhibitors comprising a composition based on volatile corrosion inhibitors comprising an efficient amount which contains an efficient amount of a solid structuring agent. The invention further concerns polymer based articles having as constituent said composition or premix; said article are useful for protecting metal parts against corrosion.

Abstract: An agent and process for the corrosion protection treatment of a metal surface are provided.

Abstract: Process for the fractionated regeneration of a weakly acid ion exchanger charged with divalent metal ions selected from nickel, zinc and manganese ions, obtaining a phosphoric-acid valuable product solution which contains these metal ions, wherein at least two portions of aqueous phosphoric acid are added to the ion exchanger one after the other, wherein each successive portion of aqueous phosphoric acid shows a lower phosphoric acid concentration than the previous one, wherein after adding the first portion of aqueous phosphoric acid to the ion exchanger, a concentrate fraction in the form of a phosphoric-acid valuable product solution containing metal ions is flushed out which contains at least 0.5 wt.

Abstract: A process for treating a nickel-bearing aqueous solution consisting of phosphating-bath overflow and/or of rinsing water after phosphating, phosphating being effected with an acidic aqueous phosphating solution that contains 3 to 50 g/l phosphate ions, reckoned as PO43−, 0.2 to 3 g/l zinc ions, 0.01 to 2.5 g/l nickel ions, optionally further metal ions as well as, optionally, accelerators, whereby the phosphating-bath overflow and/or the rinsing water after phosphating is conducted across a weakly acidic ion-exchanger, characterised in that the acid groups of the ion-exchanger are neutralised with alkali-metal ions to an extent amounting to no more than 15% and in that when it is fed to the ion-exchanger the nickel-bearing aqueous solution has a pH value within the range from 2.5 to 6.0.

Abstract: The invention relates to a process for the phosphatization of metallic substrates comprising the use of a phosphatization bath having a pH from 1 to 5.5 and which comprises from about 0.3 to about 25 g/l of zinc ion, preferably from 0.5 to 10 g/l, from 5 to about 50 g/l of phosphate ion, preferably from 8 to 30 g/l, and from about 0.01 to about 10 g/l, preferably from 0.03 to 3 g/l of a trivalent cobalt complex.

Abstract: Concentrate for activating and refining bath employed in processes of zinc phosphatization, characterized by the fact that it is based on an aqueous dispersion containing from 2 to 20% by weight of Jernstedt salts, the concentration of titanium in the dispersion consequently being from 140 to 10,000 ppm of Ti, this dispersion in addition containing:a proportion of from 0.2 to 8% by weight of at least one dispersing or sequestering agent anda proportion of from 0.05 to 7% by weight of at least one thickener based on polysaccharide.

Abstract: Process for the treatment of aluminum based substrates for the purpose of their anodic oxidation, comprising a surface treatment or chemical etching step using an acid bath comprising at least one fluorinated derivative of titanium and/or of zirconium and/or of silicium as well as at least one acid of the group comprising NO.sub.3 H, SO.sub.4 H.sub.2 and phosphoric acid.

Abstract: Process for denaturating water-dilutable paints and solvent-based paints, wherein said paints are treated by washing with the assistance of an aqueous denaturation phase whose pH is from 4.5 to 7 and preferably from 5 to 6 and which contains an effective quantity of at least one denaturation agent consisting of an amine molecule of formula ##STR1## or of formula: ##STR2## in which the substituents R.sub.1 to R.sub.7, which may be identical or different, represent:a hydrogen atom,a radical of formula --O--Re in which Re is chosen from the group comprising hydrogen and a C.sub.1 to C.sub.4 saturated aliphatic hydrocarbon chain, it being understood that the substituents R.sub.5 to R.sub.7 are not simultaneously all hydrogen atoms,or of a hydrate or else of a salt of an organic or inorganic acid salt of said amine molecule, preferably a salt of sulfuric acid, phosphoric acid or hydrochloric acid.

Abstract: Process comprisinga step for the preparation of the metallic substrate by degreasing, possibly followed by mechanical or chemical pickling,a step comprising the use by immersion or spraying of a bath adapted to provide on the metallic substrate the contemplated protective coating anda curing step at high temperature,and characterized by the fact that the above-mentioned bath comprises at least:a metal in the form of particles,chromic acid and/or one of its derivatives as oxidizing agent,at least one hydrosoluble solvent having a high boiling point and selected from those of the aprotic polar type and of the ketonic type,water.

Abstract: Herbicidal products comprising a mixture of one or several linear acid esters and one or several branched acid esters of bromoxynil and/or a mixture of one or several linear acid esters and one or several branched acid esters of ioxynil, the proportion of linear acid esters of bromoxynil in the mixture of the latter with the branched acid esters of bromoxynil being from 20-90%, preferably from 30-80% molar and the proportion of linear acid esters of ioxynil in the mixture of the latter with the branched acid esters of ioxynil being from 30-95% and, preferably, from 40-85% molar, with the proportion of branched acid esters representing each time the complement to 100%.