Process for the production of coated steel sheet

Details Process for the production of coated steel sheet Process for the production of coated steel sheet

C - Chemistry, Metallurgy

25

D

204/22

C25D 5/12 (2006.01) C25D 11/38 (2006.01)

Patent

CA 1212074

ABSTRACT OF THE DISCLOSURE: There is disclosed a two-stage process for the production of coated steel sheet particularly suitable for the fabrication of car bodies, galvanized and further protected by a layer of metallic chromium and hydrated oxides of chromium. The plating solution contains sulfide ions, chromious ions, fluoride ions, BF4ions and chromate ions. In the first stage, a 110 to 170 g/l of chromate and a current density of 40 to 80 A/dm2 are required and in the second, 33 to 52 g/l of chromate and a current density of 10 to 25 A/dm2. The improvement consists in optimizing process operating conditions - within partially known limits - to obtain a protective layer of chromium and hydrated oxides of chromium with absolutely new morphological characteristics which endow the product with corrosion-resistance far greater than that of similar products reported in the literature.

435560

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