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.