SINGLE-STEP METHOD FOR PRETREATMENT OF METAL SUBSTRATES FOR METAL COLD FORMING Russian patent published in 2024 - IPC C23C22/46 C23C22/34 C10M173/02 B21C1/00 

FIELD: technological processes.

SUBSTANCE: group of inventions relates to a method for pretreatment of a metal base for the subsequent process of cold forming of metal, pretreated metal base, method of cold forming of metal base, aqueous lubricant composition for preliminary treatment of metal base for subsequent process of metal cold forming and concentrate for its production. Method for pretreatment of a metal base includes contacting at least one surface of the base with an aqueous lubricant composition (A), having a pH value below 2.0 and in addition to water containing (a1) oxalate anions, (a2) thiosulphate anions, (a3) chloride anions, (a4) at least one film-forming polymer, which is a homopolymer and/or copolymer, (a5) at least one wax, which is different from composite component (a4), and (a6) fluoride anions and/or bifluoride anions. Said homopolymer and/or copolymer is obtained from at least one monomer, selected from a group consisting of vinylamine, vinyl alcohol, vinyl formamide, vinyl pyrrolidone, vinyl caprolactam, vinyl acetate and vinyl imidazole.

EFFECT: obtaining a dense coating on a metal base with adhesion to the base, which enables to reduce the friction coefficient during cold forming and prevent cold welding.

17 cl, 2 tbl