Method of producing metal strip having a galvanized coating...

Details Method of producing metal strip having a galvanized coating... Method of producing metal strip having a galvanized coating...

C - Chemistry, Metallurgy

25

D

204/16, 204/87

C25D 5/00 (2006.01) C25D 3/22 (2006.01) C25D 5/02 (2006.01) C25D 7/06 (2006.01)

Patent

CA 1069459

ABSTRACT OF THE DISCLOSURE A method fro producing galvanized metal sheets or strip material having a zinc coating on one side only. The method includes immersing a strip (zinc-coating on both sides) in an electrolyte and passing it between anode means and separate cathode means so as to remove a zinc coating from one side of the strip while simultaneously depositing a substantially equivalent amount of zinc on the opposite side of the strip. The cathode means is immersed in a separate caustic catholyte solution which is kept separate from the main electrolyte by an anion exchange membrane, supported at least partly within the electrolyte, so as to prevent migration of zinc from the main electrolyte to the catholyte and cathode means and the formation of a deposit on the cathode means. The method is most economically performed with a steel strip having a differential coating of zinc.

263363

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