ONE-STEP PRETREATMENT METHOD OF METALLIC SUBSTRATES AT NON-NEUTRAL PH VALUES FOR METAL COLD FORMING

The present invention relates to a method of pretreatment of a metallic substrate for a subsequent metal cold forming process, said method comprising at least steps (1) and (2), namely providing at least one substrate having at least one surface at least partially made of at least one metal (step (1...

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Bibliographische Detailangaben
Hauptverfasser: ORBEN Martin, SHI Yinfeng
Format: Patent
Sprache:eng ; spa
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Zusammenfassung:The present invention relates to a method of pretreatment of a metallic substrate for a subsequent metal cold forming process, said method comprising at least steps (1) and (2), namely providing at least one substrate having at least one surface at least partially made of at least one metal (step (1)), contacting the at least one surface of the substrate provided in step (1) with an aqueous lubricant composition (B) (step (2)), wherein the aqueous lubricant composition (B) comprises besides water at least constituents (b1) to (b4) and optionally (b5), namely as (b1) at least one homopolymer and/or copolymer being prepared by polymerization of at least vinyl pyrrolidone as at least one monomer, wherein (b1) has a polydispersity index (PDI) in a range of from 1.5 to 8.0, as (b2) at least one wax, as (b3) at least one defoamer,and as (b4) (i) oxalate anions and/or phosphate anions or (ii) calcium cations, chloride anions and hydroxide anions, as well as optionally Fe(III) ions as (b5), wherein (b5) is present in case at least oxalate anions are present as (b4), a pretreated metallic substrate obtainable by the inventive method, a method of cold forming of a metallic substrate and an aqueous lubricant composition (B) as defined above. La presente invención se refiere a un método de pretratamiento de un sustrato metálico para un procedimiento subsiguiente de conformado en frío de metales, comprendiendo dicho método al menos los pasos (1) y (2), a saber, proporcionar al menos un sustrato que tiene al menos una superficie al menos parcialmente hecha de al menos un metal (paso (1)), poner en contacto la al menos una superficie del sustrato provisto en el paso (1) de una composición acuosa de lubrificante (B) (paso (2)), en donde la composición acuosa de lubrificante (B) comprende, además de agua, al menos los constituyentes de (b1) a (b4), y opcionalmente (b5), a saber, como (b1) al menos un homopolímero y/o copolímero que se prepara mediante la polimerización de al menos una vinilpirrolidona en forma de al menos un monómero, en donde (b1) tiene un índice de polidispersidad (PDI) en un rango de 1,5 a 8,0, como (b2) al menos una cera, como (b3) al menos un desespumante, y como (b4) (i) aniones oxalato y/o aniones fosfato o (ii) cationes de calcio, aniones cloruro y aniones hidróxido, así como también, opcionalmente, iones de Fe(III) como (b5), en donde (b5) está presente en caso de que al menos los aniones oxalato estén presentes como (b4), a un sustrato metálico p