METHOD FOR PROCESSING METAL SHEET AND METAL SHEET PROCESSED BY THIS METHOD Russian patent published in 2022 - IPC C23C2/06 C23C2/26 C23C22/53 C23C22/68 C23C22/74 C23C22/83 C23C28/00 

FIELD: steel substrates.

SUBSTANCE: inventions group relates to a steel substrate, coated on at least one of its sides with a metal coating based on zinc or its alloys, having a conversion layer, an automotive part made from a steel substrate, and a processing method that ensures the formation of a conversion layer on the metal coating. The steel substrate, at least on one of the sides of which is coated with a metal coating based on zinc or its alloys, contains a metal coating coated with a conversion layer, including zinc sulfate hydrate, aluminum in an amount of 14 mg⋅m^-2, and having a surface sulfur concentration of more than or equal to 5.0 mg/m². In this case, the conversion layer contains neither zinc hydroxysulfate, nor free water molecules, nor compounds having free hydroxyl groups.

EFFECT: invention provides improved adhesion to adhesives used in the automotive industry, especially to adhesives based on epoxy resin, regardless of the drying temperature.

15 cl, 1 dwg, 1 tbl