发明名称 |
PROCESS FOR CORROSION PROTECTION OF IRON CONTAINING MATERIALS |
摘要 |
The present invention relates to a process for corrosion protection of an iron-containing substrate wherein a first zinc-nickel alloy layer, a second zinc-nickel alloy layer and a black passivate layer are deposited onto the substrate. The nickel concentration in the second zinc-nickel alloy layer is higher than the nickel concentration in the first zinc-nickel alloy layer. The substrate surface obtained is homogenously black with an appealing decorative appearance and both resistance against white rust and red rust are improved. |
申请公布号 |
US2016002804(A1) |
申请公布日期 |
2016.01.07 |
申请号 |
US201414647458 |
申请日期 |
2014.01.07 |
申请人 |
ATOTECH DEUTSCHLAND GMBH |
发明人 |
DINGWERTH Björn;KRÜGER Mike |
分类号 |
C25D5/10;C25D5/48;C25D3/56 |
主分类号 |
C25D5/10 |
代理机构 |
|
代理人 |
|
主权项 |
1. A process for corrosion protection of an iron-containing substrate comprising, in this order, the steps of
(i) providing a substrate made of an iron-containing material, (ii) electroplating onto said substrate a first zinc-nickel alloy layer having a nickel concentration in the range of 6 to 15 wt.-%, (iii) thereon, electroplating a second zinc-nickel alloy layer having a nickel concentration in the range of 12 to 30 wt.-% onto the first zinc-nickel alloy layer with the proviso that the concentration of nickel in the second zinc-nickel alloy layer is higher than the nickel concentration in the first zinc-nickel alloy layer, and (iv) depositing a black passivation layer onto the second zinc-nickel alloy layer. |
地址 |
Berlin DE |