Passivation of zinc on steel with chromic anhydride prior to...

Details Passivation of zinc on steel with chromic anhydride prior to... Passivation of zinc on steel with chromic anhydride prior to...

C - Chemistry, Metallurgy

25

D

204/22

C25D 5/34 (2006.01) C23C 28/00 (2006.01) C25D 11/38 (2006.01)

Patent

CA 1238602

ABSTRACT OF THE DISCLOSURE: An improved process for the protection of flat rolled steel sections in the form of bands, plates or sheets in particularly aggressive environments, in which steel plates previously plated with zinc or zinc alloys are, as such, plated with layers of an electrolytic plating consisting of inorganic elements or compounds, preferably metallic chrome and chrome oxide. This process is improved in that it also comprises a chemical passivation in a chrome anhydride solution of the zinc base plating layer, prior to carrying out the successive multi-layer electrolytic plating of inorganic elements or compounds.

460785

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