Abstract:
A surface of aluminiferous metal is brought into contact at 25 to 65 C DEG for 2 to 100 seconds with a surface treatment bath with a pH of 1.0 to 6.0 that contains phosphate ions, dissolved titanium and/or zirconium compounds, dissolved fluorine-containing anions, and a water soluble polymer in the following weight proportions: 1 - 100:1 - 50:1 - 200:1 - 200. This is followed by a water rinse and drying. The water soluble polymer has a chemical structure conforming to formula (I), in which each of X and X represents a hydrogen atom, a C1 to C5 alkyl group, or a C1 to C5 hydroxyalkyl group; each of Y and Y represents a hydrogen atom or a moiety "Z" that conforms to formula (II) or (III), wherein each of R , R , R , R , and R represents a C1 to C10 alkyl group or a C1 to C10 hydroxyalkyl group; the average value for the number of Z moieties substituted on each aromatic ring in the polymer molecules is from 0.2 to 1.0; n is an integer; and the average value of n for the total polymer is from 2 to 50.
Abstract:
Heating an aqueous mixture of a fluoroacid such as H2TiF6 and an oxide, hydroxide, and/or carbonate such as silica produces a clear mixture with long term stability against settling of any solid phase, even when the oxide, hydroxide, or carbonate phase before heating was a dispersed solid with sufficiently large particles to scatter light and make the mixture before heating cloudy. The clear mixture produced by heating can either be mixed with water soluble and/or water dispersible polymers that are polyhydroxyalkylamino-substituted polymers and/or copolymers of p^_-vinyl phenol, or with soluble hexavalent and/or trivalent chromium, to produce a composition that improves the corrosion resistance of metals treated with the composition, especially after subsequent painting.
Abstract:
The present invention relates to ether sulfates based on isomeric tridecyl alcohol mixtures, compositions comprising the inventive ether sulfates based on isomeric tridecyl alcohol mixtures and their uses.
Abstract:
The present invention relates to a method for treatment of at least one metallic surface of a substrate comprising at least a step of contacting said surface with an acidic aqueous composition (A), said acidic aqueous composition (A) comprising (a) one or more metal ions selected from the group of titanium, zirconium and hafnium ions (b) and one or more polymers (P) containing OH- and/or COOH-groups as well as at least one sulfur-containing moiety, to a corresponding acidic aqueous composition (A) as such, to a master batch to produce such acidic aqueous composition (A), to the use of the acidic aqueous composition (A) for treating metallic surfaces and to substrates comprising the thus treated surfaces.
Abstract:
The present invention is directed to an aqueous basic etching composition for the treatment of surfaces of metal substrates, the composition comprising: (a) functionalized urea, biuret and guanidine derivatives and/or salts thereof selected from the group comprising compounds having formulae (I) and (II) and/or salts thereof, wherein X and Y are independently selected from the group comprising oxygen, NRR' and NR5, wherein R, R' and R5 are independently selected from the group comprising R1, hydrogen, polyethylene glycols, aromatic compounds, and C1-C4 alkyl, wherein the aromatic compounds and C1-C4 alkyl optionally comprise at least one substituent selected as OR6, wherein R6 is selected from the group comprising hydrogen and C1-C4 alkyl, wherein X and Y can be identical or different; R1 and R2 are independently selected from the group comprising hydrogen, alkyl compounds, amines, and nitrogen-comprising heteroaromatic compounds, wherein R1 and R2 can be identical or different, with the proviso that R1 cannot be hydrogen, and with the proviso that in compounds having formula (I) R1 cannot be hydrogen or alkyl compound if X is oxygen; m is an integer from 1 to 4, preferably 3; and n is an integer from 0 to 8, preferably 2 to 4; wherein m and n can be identical or different; (b) an oxidizing agent for oxidizing the metals of the metal surface to be treated; and wherein the aqueous basic etching composition comprises a pH from 7.1 to 14.
Abstract:
The presently claimed invention relates to a composition comprising at least one polyurethane polymer. The presently claimed invention particularly relates to use of the composition comprising at least one polyurethane polymer for metal pre-treatment and a process for metal pre-treatment.
Abstract:
The present invention concerns a concentrate comprising at least one brazing flux, at least one binder and water in a specific ratio; a process for the manufacture of a brazing flux paint composition which comprises the steps of a) providing the concentrate and b) mixing the concentrate with at least one liquid carrier; and a process for brazing of parts of aluminum, aluminum alloy, in particular aluminum alloy comprising magnesium, steel, copper and titanium with parts of aluminum or aluminum alloy, which comprises the process for the manufacture of a brazing flux paint composition.
Abstract:
Die vorliegende Erfindung betrifft ein verbessertes Verfahren zur korrosionsschützenden Vorbehandlung einer metallischen Oberfläche, welche Stahl, verzinkten Stahl, Aluminium,eine Aluminiumlegierung, Magnesium und/oder eine Zink-Magnesium-Legierung enthält, bei dem die metallische Oberfläche i) mit einer sauren wässrigen Zusammensetzung A, die a1) mindestens eine Verbindung ausgewählt aus der Gruppe bestehend aus Titan-, Zirkonium- und Hafnium-Verbindungenumfasst,und ii) mit einer wässrigen Zusammensetzung B, die b1) mindestens ein (Meth)acrylatharz und b2) mindestens ein Phenolharz umfasst, in Kontakt gebracht wird, wobei die metallische Oberfläche zuerst mit der Zusammensetzung A und dann mit der Zusammensetzung B und/oder zuerst mit der Zusammensetzung B und dann mit der Zusammensetzung A und/oder gleichzeitig mit der Zusammensetzung A und der Zusammensetzung B in Kontakt gebracht wird. Ferner betrifft die Erfindung eineentsprechende wässrige Zusammensetzung B, ein nichtwässriges Konzentrat zur Herstellung dieser Zusammensetzung, eine entsprechend beschichtete metallische Oberfläche sowie die Verwendung eines entsprechend beschichteten metallischen Substrats.