C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22, 204/25.5
C25D 5/12 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1236791
ABSTRACT OF THE DISCLOSURE: The invention relates to a process for the protection of flat steel rolled sheets previously plated with zinc or zinc containing alloys, comprising:depositing on the surface of the previous plating a layer of chromium metal having a thickness of at least about 0.55 g./m.2 by electrodeposition; and then depositing on the surface of the layer of chromium metal a layer of chromium oxide by electrodeposition, wherein the chromium oxide layer has a thickness of at least about 0.035 g./m.2 and the weight ratio of the chromium metal to the chromium contained in the chromium oxide in the respective deposits is from 25:1 to 4:1. The invention also relates to the product obtained with this process.
447693
Robic Robic & Associes/associates
Zincroksid S.p.a.
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