Aluminum alloy cathode plate for electrowinning of zinc

C - Chemistry – Metallurgy – 25 – C

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C25C 7/02 (2006.01) C25C 1/16 (2006.01)

Patent

CA 2166590

Cathode plate aluminum sheet product for use in electrowinning of zinc in sulfuric acid containing electrolyte bath comprises an alloy (a) consisting essentially of about 0.2 to 0.5% magnesium, 0.15% maximum silicon, 0.1% maximum iron, 0.05% maximum copper, and 0.05% maximum zinc, the balance substantially aluminum and incidental elements and impurities, said aluminum amounting to at least 99% of said aluminum alloy, or (b) consisting essentially of about 0.08 to 0.23% silicon, 0.1% maximum iron, 0.05% maximum copper, 0.05% maximum magnesium 0.05% maximum zinc, the balance substantially aluminum and incidental elements and impurities, said aluminum being at least 99.4% of said alloy. The sheet products are work hardened by cold rolling and have a minimum yield strength of at lease 14 ksi, preferably at least 15 or 16 ksi, and an electrical conductivity of preferably 58%\ I.A.C.S. or more together with good corrosion resistance. The combination of properties enables longer cathode service life in the harsh sulfuric acid containing electrolytic cell.

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