公开(公告)号：EP4269652A1

公开(公告)日：2023-11-01

申请号：EP22171011.4

申请日：2022-04-29

申请人： Atotech Deutschland GmbH & Co. KG

发明人： Sharma, Prateek ,  Kumar, Veerendra ,  Sardana, Nitin ,  Kaczmarek, Michal

IPC分类号： C23C22/78 ,  C23C22/83 ,  C23C22/06 ,  C23C22/17

摘要： The present invention refers to a method for black-passivating a zinc layer, a respective black-passivation composition comprising one or more than one blackening agent selected from the group consisting of formula (I), salts, and stereoisomers thereof, and a respective use of such blackening agents for black-passivating a zinc layer, wherein the zinc layer is substantially free of, preferably does not comprise, nickel.