Process for coating aluminum with zinc

Details Process for coating aluminum with zinc Process for coating aluminum with zinc

C - Chemistry, Metallurgy

23

C

117/77

C23C 18/31 (2006.01)

Patent

CA 1204969

A B S T R A C T A two-step process for coating a surface of an aluminium article with zinc, wherein the surface is ini- tially exposed to a zincate bath under relatively weak zinc-depositing conditions, and then further exposed to a zincate bath under stronger zinc-depositing conditions (lower ZnO concentration and/or higher temperature), to establish thereon an adherent coating of metallic zinc. The coated article may be heated to effect diffusion of the zinc into the aluminium for producing a zinc-enriched region adjacent the surface to protect the surface against corrosion.

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