US 2023/0091443 A1Published application

One-step pretreatment method of metallic substrates for metal cold forming

AssigneeChemetall GmbH

InventorsYinfeng SHI, Martin ORBEN

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Abstract

Disclosed herein is a method for pretreatment of a metallic substrate for a subsequent metal cold forming process, said method including (1) providing at least one substrate, (2) contacting the at least one surface of the substrate provided in step (1) with an aqueous lubricant composition (A). and optionally (3) drying the coating film obtained after having performed step (2). Further disclosed herein are a pretreated metallic substrate obtainable by the aforementioned method, a method of cold forming of a metallic substrate including a step of subjecting the inventive pretreated metallic substrate to a cold forming process, an aqueous lubricant composition (A) as defined above, and a master batch for preparing the aqueous composition (A).

Claims20

Dependent claims

A method for pretreatment of a metallic substrate for a subsequent metal cold forming process, said method comprising at least steps (1) and (2) and optionally step (3),

(1) providing at least one substrate having at least one surface at least partially made of at least one metal,
(2) contacting the at least one surface of the substrate provided in step (1) with an aqueous lubricant composition (A) having a pH value below 2.0, wherein the aqueous lubricant composition (A) comprises, in addition to water:
(a1) oxalate anions,
(a2) thiosulfate anions,
(a3) chloride anions,
(a4) at least one film-forming polymer, which is a homopolymer and/or copolymer being prepared by polymerization of at least one ethylenically unsaturated monomer,
(a5) at least one wax, which is different from constituent (a4), and
(a6) fluoride anions and/or bifluoride anions,
and
(3) optionally drying the coating film obtained after having performed step (2).

7 more elements

Dependencies are inferred from the claim text.