公开(公告)号：US20200040438A1

公开(公告)日：2020-02-06

申请号：US16653183

申请日：2019-10-15

Applicant: ArcelorMittal

Inventor： Lydia RACHIELE ,  Herve DERULE ,  Delphine THAI

IPC: C23C2/06 ,  C23C2/26 ,  C23C22/05 ,  C23F11/14 ,  C25D3/22 ,  C25D5/48

Abstract: A coated metal sheet is provided. The coated metal sheet includes a steel substrate, a metal coating on at least one face of the steel substrate, the metal coating comprising at least 40% by weight of zinc; and a layer coating an outer surface of the metal coating, the layer including an amino acid in a neutral or salt form, the amino acid being selected from among alanine, arginine, aspartic acid, cysteine, glutamine, lysine, methionine, proline, serine, threonine, or of a mixture thereof, the amount of said amino acid or of said mixture being from 0.1 to 200 mg/m2, and optionally a base or a mixture of bases, or an acid or a mixture of acids.

公开(公告)号：US20240093375A1

公开(公告)日：2024-03-21

申请号：US17768009

申请日：2020-10-12

Applicant: ArcelorMittal

Inventor： Frida GILBERT ,  Lydia RACHIELE ,  Delphine THAI ,  Christian ALLELY

IPC: C23C22/53 ,  C23C22/82 ,  C23C28/00

CPC classification number: C23C22/53 ,  C23C22/82 ,  C23C28/3225 ,  C23C28/34

Abstract: The invention relates to a steel substrate coated on at least one of its faces with a metallic coating based on zinc or its alloys wherein the metallic coating is itself coated with a conversion layer comprising:



zincsulphate hydrate,
aluminium in an amount up to 14 mg·m−2,
wherein the conversion layer comprises neither zinc hydroxysulphate, nor free water molecules nor any compounds having free hydroxyl groups, the surface density of sulphur in the conversion layer being greater than or equal to 5.0 mg/m2. The invention also relates to the corresponding treatment method.