公开(公告)号：US20200216964A1

公开(公告)日：2020-07-09

申请号：US16648829

申请日：2018-09-14

Applicant: ArcelorMittal

Inventor： Lydia RACHIELE ,  Frida GILBERT ,  Christophe KLAM ,  Akshay BANSAL

IPC: C23C22/53 ,  C23C2/06 ,  C23C2/26 ,  C23C22/68 ,  C23C22/74 ,  C23C28/00

Abstract: 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 zincsulphate-based layer—includes at least one of the compounds selected from among zincsulphate monohydrate, zincsulphate tetrahydrate and zincsulphate heptahydrate, wherein the zincsulphate-based layer has neither zinc hydroxysulphate nor free water molecules nor free hydroxyl groups, the surface density of sulphur in the zincsulphate-based layer being greater than or equal to 0.5 mg/m2. A corresponding treatment method is provided.

公开(公告)号：US20200299844A1

公开(公告)日：2020-09-24

申请号：US16649246

申请日：2018-09-14

Applicant: ArcelorMittal

Inventor： Lydia RACHIELE ,  Frida GILBERT ,  Herve DERULE

IPC: C23C28/00 ,  C23C2/06 ,  C23C2/40 ,  C23C22/53 ,  C23C22/68 ,  C23C22/82

Abstract: A steel substrate is provided, 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 zincsulphate-based layer including at least one of the compounds selected from among zincsulphate monohydrate, zincsulphate tetrahydrate and zincsulphate heptahydrate, wherein the zincsulphate-based layer has neither zinc hydroxysulphate nor free water molecules nor free hydroxyl groups, the surface density of sulphur in the zincsulphate-based layer being greater than or equal to 0.5 mg/m2. A corresponding treatment method is also provided.

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.